Re: [Emc-users] Matrix Wiring

[Peter Blodow]

Andy,
I remember, long ago, having used some sort of multiple pin plug system 
where the pins (gold plated) were delivered separately from the plug 
body. The pins were then equipped with the wires, crimped and 
lock-fitted into the plug body. The pins, that's the point, consisted of 
a thin solid core with 3 or 4 tiny springy 'blades' surrounding it that 
made absolutely perfect contact. They were surely less than 2 mm thick. 
There was another kind (for higher currents), just tinned, but more than 
2 mm thick. I just can't remember the brand name ...

Peter


Am 12.07.2022 um 11:40 schrieb andy pugh:

Not CNC related, but I thought that someone here might know the answer.

I want to make a rewirable adaptor (OBDII to DB15)

One neat way to do this would be with a matrix, where you plug something
into holes and that connects the row to the column.

As a CNC link (almost) I think that something like this was used on the MEC
Microsprint programmable lathes where things often called "diodes" were
plugged into holes to program the machine.

I feel that a couple of PCBs. spaced a small distance apart, could have
plated-through holes linked by "something" being plugged through them. The
problem being to find the "something" that will make contact with two holes
at the same time.

A single PCB and an array of jumpers would work, but that would be 480 pins
to keep track of

The plated-hole idea has 240 holes, but only needs 8 plugs to do the
programming I need.

2mm banana plugs do exist.
https://uk.rs-online.com/web/p/banana-connectors/7632907

But I am not sure if they will reliably connect two plated holes.





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Re: [Emc-users] Do pnp prox switches need a pulldown load R?

[Peter Blodow]

Gentlemen,

for clarification a few additions to the color (or coulour, for Andy) 
system in electricity supply, used in Germany (DIN and VDE) and most of 
Europe:


- First, always keep neutral and ground apart! The FI switch is designed 
to trip at any connection between them, even in absence of mains voltage 
in that particular circuit. Generally, four leads come into the house 
from the community supply:


Brown, black, black are the three phases P1, P2, P3 or L1, L2, L3 
(formerly called X, Y, Z)

Neutral, blue (comes also from the transformer station)

- Earth (is connected to ground only at the very location, i.e. the 
house supply box)
N and PE are connected together in the house supply box, so from there 
on they are five leads going to the measuring device, fuse boxes and 
distribution of the house. This widely distributed local grounding 
ensures also the centering of the supplier's distribution network. 
Depending on the load situation, there may a few volts difference 
between N and PE.


- Green and yellow is always earth = ground labelled PE, protective 
earth), e.g connected with the water pipe, a special ground anchor, the 
steel armour in concrete foundations or a foundation ground lead. 
Green/yellow wire may not be used for anything else except for tieing 
potato sacks!


- In general, blue is neutral, but may carry other potentials also if in 
shortage of more colors, labelled N.


- Formerly, grey was used for N (beware of old installations!)

- Black is the most dangerous color: permanent live in alternating 
current circuits, labelled P or Ph or P1, P2, P3, or L, L1, L2, L3


- Brown can also be permanently live, but is preferably used for live 
(phase) in switched circuits, i.e., may be live or not, you may have a 
chance to live


- In three phase systems - the most commonly applied supply system in 
today's houses - the three phases are brown, black, black (rarely grey). 
The latter can be switched to achieve correct field rotation without 
offending the wiring schematic.


- All other colors may be used for various purposes, preferably for 
momentary relays, alternate switch circuits or machine outputs. I use 
violet and green to activate impulse relays e.g. in staircases etc.


- In very old installation, PE was red, sometimes also later, especially 
in Switzerland


- Industry is adapting these colors increasingly for the inside wiring 
of electrical devices, too


So, keep away from brown or black wires and have care with blue ones!  
And remember what I learned in my electricity courses in the US: - 
Always keep one hand in your pocket when dealing with live appliances,

- only use the monkey grip (without the thumb being involved) and
- if there is no chance to grab a measuring device first, test first for 
live appliances with the upside of your finger (there they are drier)!


Best regards
Peter



Am 12.05.2022 um 11:50 schrieb andy pugh:

On Thu, 12 May 2022 at 06:31, Philipp Burch  wrote:


I could imagine that the colors are due to the usual coding (at least in
Europe) for AC circuits with brown=Phase (hot wire) and blue=Neutral
(cold wire).

UK fixed household wiring used to be red for live and black for neutral.
Then three-phase was red-blue-yellow with black neutral.

In 2006 we harmonised with Europe, so that it is blue neutral, brown
live and three-phase is brown-black-grey with a blue neutral.

So, now when you find a wire:

green/yellow - always earth
black - live or neutral
blue - live or neutral (already the case before harmonisation)
brown - live
red - live
yellow - live
grey - live

In fairness, appliance flex has always been brown-live blue-neutral
for as long as I have been wiring plugs, so it makes sense for the
fixed wiring to match. But the colour choice for 3-phase seems odd.





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Re: [Emc-users] Stepper PID

[Peter Blodow]

Thaddaeus,
in your image0, I count 7 beats to the bar, seven, is that right? (In 
image1 it is imposible to tell the pulses apart). This reminds me of the 
first time I set up a stepper configuation using stepconf (in the early 
2010's). I encountered similar behaviour of the motors as you did and, 
after days of fiddling around, finally detected that stepconf made a 5 
beats to the bar music. Took me quite a lot of convincing work to the 
programmer's community then to get that fixed.


Peter


Am 03.02.2022 um 00:54 schrieb Thaddeus Waldner:

In case anyone is interested, here’s a scope capture of the step pulse train 
with and without the DPLL configured.




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Re: [Emc-users] rotary table re-engineeering

[Peter Blodow]

Gentlemen,
how come that some messages have appeared twice lately, sent at the same 
time? For instance, this one:

Peter

Am 24.01.2022 um 16:44 schrieb Jon Elson:
I had a Palmgren rotary table with XY linear slides, similar to the 
one in recent pictures.  The handles were different, otherwise I'd say 
mine was identical.  But, I found the XY slides to be VERY floppy, it 
made machining very difficult.  It caused terrible chatter and poor 
finishes.  I was not able to tighten anything up to make it mire 
rigid.  Once I got CNC running, I got rid of it.


Jon




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Re: [Emc-users] Metallurgical Advice?

[Peter Blodow]

Todd, from my experience of the mechanical shop at my company (some time 
ago), where a lot of alu welding was done, a cast alu workpiece must be 
heated to at least 200 to 300 degree Celsius before attempting to weld 
it with a tungsten arc burner. At such a large piece I guess 4-6 men 
with strong torches ar needed to achieve that. You would need 300 to 400 
amperes for the arc and, as a guess, a 5 mm electrode with a rounded 
tip. The crack must be widened before by grinding it out generously. 
Besides, the welder - experienced specialist - will need long arms and a 
good heat protection suit, working so close above a mildly glowing plate 
that size, if I picture the position of the crack correctly from the 
description.


 And there is no guarantee that the crack will be healed permanently 
after cooling. Obviously there was a lot of tension already in the piece 
before, or else it would not have been cracked by the fire. My advice 
ist to forget it and try to get a replacement part. Alu has a good price 
momentarily at the junk dealers. Sorry!


Peter Blodow
Dipl.-Phys.


Am 28.07.2021 um 19:25 schrieb Todd Zuercher:

We had a bit of a disaster last night.  Because of poorly trained, inattentive 
machine operators on 3rd shift, we had a pretty bad fire on one of our CNC 
routers.  The improperly set the depth, then started the machine, turned and 
walked away, then evacuated the building when the fire alarm went off, and 
never even looked at or stopped the machine.  It ran on and burned for more 
than 20 min until the FD showed up.

It burned off all the dust-shroud brushes, the dust collector hose, and the 
vacuum hose to the table.
Not sure if the wiring for the air cylinder sensors for the dust-shroud doors 
will be ok. (They look a little melted)  Or if the air cylinders will still 
work. The lines to them will have to be replaced

The a 10kw HSK63f router spindle is wrecked (doesn't spin free), we'll send it 
out to see if it's rebuildable.

But the biggest problem is that the 5ft by 10ft 1.5inch thick cast aluminum 
table cracked!  It cracked about 2ft in from the front left corner and runs 
about half way across the table in the 5ft direction.  The table is supported 
from below by 10 linear guide blocks on two rails. The crack runs across 
between the 1st and 2nd set of blocks, about 4inches from the 2nd block.

Is there any hope of repairing the table?  Are we going to have to replace the whole 
table?  Could the crack be welded, or is that a bad idea?  My main fear is that warpage 
issues will cause the linear guides to bind.  (The table surface can always be re-milled 
flat.)  The crack isn't gaping or misaligned, and the table doesn't "look" 
warped now that It's cool.

Todd Zuercher
P. Graham Dunn Inc.<http://www.pgrahamdunn.com/index.php>
630 Henry Street
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031


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Re: [Emc-users] Code of Conduct

[Peter Blodow]

Nikolaus:

Aurea prima sata est aetas,
quae vindice nullo,
sponte sua,
sine lege
fidem rectumque colebat.

(Publius Ovidius Naso, Metamorphoses)

*This was the Golden Age that, **
**without coercion, **
**without laws, **
**spontaneously nurtured **
**the good and the true.*


Let's try to get back to the Golden Age!
Peter


Am 18.07.2021 um 10:07 schrieb Dr. Nikolaus Klepp:

Oh yes ... and to not disturb the policemen any more I asked for my forum 
account to be deleted (which thankfully was done) and unsubscribe from the 
lists. Let the policemen guide your steps, the community will definitly prosper!

Nik

Anno domini 2021 Sat, 17 Jul 22:43:30 -0600
  R C scripsit:




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Re: [Emc-users] Running 440V 3PH 2 speed motor off 220V 3PH or 1PH?

[Peter Blodow]

Am 17.06.2021 um 07:20 schrieb Roland Jollivet:

...
I don't know if you can use a 110V:24V transformer in reverse, or whether
you'll cook it. Worth a try...

Roland

NO!!!

Peter


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Re: [Emc-users] EDM from scratch

[Peter Blodow]

Andy,
I have been experimenting with EDM long time ago, say 25 years. I used a 
simple RC-circuit together with a "soft" transformer (ca.1.5 mm air gap) 
in order to forgive for the shorts and save fuses. All was mounted on my 
drill press. I gave up when I realized that without a controlled 
transistor (Lazarenko-)generator I would not get reasonable results. It 
seemed to me that developing such a generator would exceed the 
experimental effort I was willing to make, as there was no real 
application in sight. I wasn't even thinking of EMC table motion control 
at that time.


I still remember that I was using a much larger capacitor, even up to 1 
F and 60 Volts from an old IBM Printer supply I happened to have at 
hand. With an uncontrolled, deliberate discharge of this capacitor, 
about a 5-10 mm length of 10 mm² shorting cable disapeared at once, 
producing black metal vapor. Therfore, there was a second resistor (way 
below 1 Ohm) between the capacitor and the electrode to limit the short 
current and avoid sticking.

And boy, that was a messy and noisy affair!
I suppose you have read his (and other links): 
https://en.wikipedia.org/wiki/Electrical_discharge_machining

Good luck!
Peter

Am 31.01.2021 um 14:28 schrieb andy pugh:

I have started to play around with EDM. The intention is to make an
EDM "grinder" to profile tool steel and possibly carbide cutting tools
using CNC-turned profiles.

At the moment I am using a cobbled-together XY table with a couple of
STMBL drives.
One of the STMBL analogue inputs is used to measure the current
through the gap. (ie using the voltage across the resistor that a
capacitor is charged through).
Then a PID controller tries to achieve a target current by adjusting
the adaptive feed pin.

I think that it shows promise, but only partly works.

I am using a 50R resistor and a 1000uF capacitor. I suspect that this
is too high on both counts.
I am working at 40V and it seems that the tool welds to the work too readily.

I suspect that I would get different results if I controlled to the
gap voltage, rather than charging resistor voltage. And probably
better still with some sort of signal processing on that voltage.

What combination of R, C and V would be typical for a servo-controlled
eroder? I imagine it might be different to a "doorbell" style one.

Current set up: https://youtu.be/nxpmEFnmK-A





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Re: [Emc-users] Editing glade ui's on RPi

[Peter Blodow]

Ralph, if you have a question or problem with a German site, let me 
know, I'd gladly help.

Peter

Am 15.01.2021 um 17:41 schrieb Ralph Stirling:

Now that I have my 7i90 hardware working with
the RPi 3b+, I need to make some changes to my
Axis ui customizations.  Gladevcp is present, but
not glade-gtk2, so I have nothing to edit the ui with.
Glade-gtk2 doesn't seem to be in the apt repository
either.  The only reference I have found to this is a
sped-up video narrated in German, which doesn't
help me much.

Anybody overcome this one yet?  The docs warn of
not using too new a version of glade-gtk2, so I suspect
glade-gtk3 is a non-starter.

Thanks again.
-- Ralph

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Re: [Emc-users] buster xfce4-goodies installed, ought to have a power capable screen blanker.

[Peter Blodow]

Gentlemen,
what is a screen saver good for in the days of TFT or LED screens? No 
tube, little power, eternal life - nothinh to save there any more! So, 
who put it in an actual current version of a program or OS and for what 
purpose?

Peter


Am 03.10.2020 um 12:44 schrieb andy pugh:

On Sat, 3 Oct 2020 at 03:17, Gene Heskett  wrote:

so something else is turning it back on. But its not in that directory:
gene@lathe:/usr/share/X11/xorg.conf.d$ grep DPMS *
10-monitor.conf:Option  "DPMS" "Disable"

xset q

Will tell you the current status.

/usr/share/X11 seems to be intended for special purposes:
https://www.x.org/releases/current/doc/man/man5/xorg.conf.5.xhtml

The iso also has light-locker removed, but you decided no to do that.
However light-locker should only ever run if the blanker / screensaver comes on.

Try removing xscreensaver.desktop and light-locker.desktop from the
/etc/xdg/autostart directory.





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Re: [Emc-users] precisiomn indexer

[Peter Blodow]

The point is the self-centering action which allows positioning down to 
one arcsec.

See https://de.wikipedia.org/wiki/Hirth-Verzahnung
Peter

Am 28.08.2020 um 12:54 schrieb andy pugh:

On Fri, 28 Aug 2020 at 11:21, Thomas J Powderly  wrote:

Gene an old client called about using a Newbould indexer on his machine.

That's rather clever, using a differential indexer to get finer graduations.

The idea goes back a long time, the same principle was used for
magneto couplings in the early days of motoring:
https://commons.wikimedia.org/wiki/File:Vernier_coupling_(Manual_of_Driving_and_Maintenance).jpg

Though the example in the video seems different, and in fact _appears_
to be using a non-integer number of teeth in the bottom interface...

Another unexpected place that you might find a Hirth coupling is in
the middle of a set of bicycle cranks:
https://www.parktool.com/blog/calvins-corner/campagnolo-ultra-torque-and-record-group





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Re: [Emc-users] Can't get chuck inside

[Peter Blodow]

What kind of machine are you taking about?
Peter

Am 07.06.2020 um 14:24 schrieb N:

I can't get the chuck inside.

Think I got the right chuck ISO40 but are not totally sure, then I try to 
insert it I hit something at the bottom. There is a pneumatic pipe and tried 
this one and also a hydraulic hose connected to a high pressure pump but have 
no idea what happen on inside. Do anybody else have? Then pneumatic pressure 
should be applied and then hydraulic pump should be started?

Regards Nicklas Karlsson


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Re: [Emc-users] Small torque, spindle gear box clutch?

[Peter Blodow]

My lathe internally provides 24 V DC for these clutches at about 1.5 
Ampere each. Try measuring the voltages in the electric cabinet.


Peter

Am 12.04.2020 um 20:48 schrieb N:

On Sun, 12 Apr 2020 at 16:09, N  wrote:


There some kind of electrical connection. Anybody have any idea if it is common 
to have some kind of clutch for spindle?

Yes. My lathe, for example, has a 2-speed gearbox that contains two
electromagnetic clutches and an electromagnetic brake.

This one is a CNC machine. There is some kind of electrical connection but to 
tell what kind of signal is needed is not obvious, maybe with some luck I did 
not remove cable in other end.


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Re: [Emc-users] Small torque, spindle gear box clutch?

[Peter Blodow]

Nicklas,
my Graziano lathe has 5 electric clutches für 4 gears and reverse. 
Without activating these the spindle will only be turned slightly by the 
heavy oil in the gear case. Such a feature makes the machine ideal for 
electrical control in order to face off and form cut large flat cast 
iron grinding slabs, starting out from 400 mm radius and continously 
cutting with accelerating speeds down to the very center without pausing 
fo gear change.


Peter


Am 12.04.2020 um 17:06 schrieb N:

Try to run spindle motor om a machine today, this is my first CNC machine so I 
am a little bit uncertain. Motor run but spindle does not, there of course is a 
possibility gear box i broken but in such case I would have expected noise, 
there is some torque on spindle make it move slowly but not normal.

There some kind of electrical connection. Anybody have any idea if it is common 
to have some kind of clutch for spindle?


Regards Nicklas Karlsson


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Re: [Emc-users] Gecko Failure

[Peter Blodow]

Gentlemen,
tin happens to stand near to the transition metals in the periodic 
system and thus tends to slowly turn from metallic (conductive) to 
crystaline (noc-conductive) as time goes on. At room temperature this 
takes very long, say 10 years or more, at low temperature faster, 
especially below -20 or -30 degrees Celsius. I had such a problem with 
my refrigerator where the temperature sensor or its plug developed high 
resistance, freezing all the contents to -10 degrees over night. A 
temporary means to fix this is to waggle the connectors from time to 
time. Napoleons soldiers in Russia in 1812 had tin buttons on their 
uniform trousers and jackets which turned into crumbs in siberian 
winter, a great problem for the great emperor.


Always chose galvanized golden pins and connectors!

Peter



Am 06.04.2020 um 18:43 schrieb Peter C. Wallace:

On Mon, 6 Apr 2020, Jon Elson wrote:


Date: Mon, 06 Apr 2020 11:27:23 -0500
From: Jon Elson 
Reply-To: "Enhanced Machine Controller (EMC)"

To: "Enhanced Machine Controller (EMC)" 


Subject: Re: [Emc-users] Gecko Failure

On 04/05/2020 11:24 PM, John Dammeyer wrote:

Anyone ever run into this sort of thing with a G213V driver?
http://www.autoartisans.com/mill/G213V-Failure.jpg

It was running the Knee with a 1200 oz-in motor and 60VDC power supply.


Typical result of a high-resistance connection getting hot. And, 
almost everybody in the industrial connector business makes these 
"Euro-style" connectors, so I'm sure for cost reasons Gecko does

NOT use Phoenix Contact parts, but a Chinese equivalent.

It may also be that transistors in the Gecko failed and it put full 
DC supply voltage on the motor winding

until fuses or whatever blew.

Jon




Yeah, its unusual for the drive power connections to fail since they 
typically have low average current. Its much more common for the motor 
connections to fail


The general problem with Tin connectors is that they have a positive 
feedback failure mechanism if used anywhere near their current 
limits,  their contact resistance rises over time and heat exposure 
and the higher the resistance,

the high the temperature and the faster this degradation progresses...

Peter Wallace
Mesa Electronics


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Am 06.04.2020 um 18:43 schrieb Peter C. Wallace:

On Mon, 6 Apr 2020, Jon Elson wrote:


Date: Mon, 06 Apr 2020 11:27:23 -0500
From: Jon Elson 
Reply-To: "Enhanced Machine Controller (EMC)"
    
To: "Enhanced Machine Controller (EMC)" 


Subject: Re: [Emc-users] Gecko Failure

On 04/05/2020 11:24 PM, John Dammeyer wrote:

Anyone ever run into this sort of thing with a G213V driver?
http://www.autoartisans.com/mill/G213V-Failure.jpg

It was running the Knee with a 1200 oz-in motor and 60VDC power supply.


Typical result of a high-resistance connection getting hot. And, 
almost everybody in the industrial connector business makes these 
"Euro-style" connectors, so I'm sure for cost reasons Gecko does

NOT use Phoenix Contact parts, but a Chinese equivalent.

It may also be that transistors in the Gecko failed and it put full 
DC supply voltage on the motor winding

until fuses or whatever blew.

Jon




Yeah, its unusual for the drive power connections to fail since they 
typically have low average current. Its much more common for the motor 
connections to fail


The general problem with Tin connectors is that they have a positive 
feedback failure mechanism if used anywhere near their current 
limits,  their contact resistance rises over time and heat exposure 
and the higher the resistance,

the high the temperature and the faster this degradation progresses...

Peter Wallace
Mesa Electronics


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Re: [Emc-users] No mails

[Peter Blodow]

Well, since I mailed my complaint, I got some mails again. Strangely, 
Leonardo Marsaglia reported the same phenomenon I had encountered for 
half a week, but apparently others didn't. Can selective mail 
transportation or delivery of some kind exist there, something like US 
vs. other countries?? My mail server here in Germany can't be the reason 
because it's my own private domain server (kontent.com), and nothing has 
been changed on it for eons.

Peter



Am 06.03.2020 um 18:20 schrieb Gene Heskett:

On Friday 06 March 2020 09:32:25 Peter Blodow wrote:


Gentlemen,
I haven't received any mail from the list since March 2nd. Is there
something wrong, or is there just no issue?
Peter

I have rx'd 28 or more msgs since midnight wed morning, from the devel
list and the users list combined Peter, but mostly the developers list.
So I'd have to say somethings blocking them near your end.

You might see if the list needs to be white-listed at your ISP. I had to
tell the tech guy at shentel I had rather eclectic interests and had him
make about 50 entries to the white-list, and their spambot still blocks
an occasional message that slips by the poor spam filtration at debian.
That gets me a threatening email from the debian server, because my ISP
bounced it.

I've gone to the link and looked at the cause message and spamassassin
would have sent it to /dev/null, but debian bounces it, and sends me the
unsubscribe threat.

Since I have o control, I delete them.

Cheers, Gene Heskett




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[Emc-users] No mails

[Peter Blodow]

Gentlemen,
I haven't received any mail from the list since March 2nd. Is there 
something wrong, or is there just no issue?

Peter


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Re: [Emc-users] install problems

[Peter Blodow]

I have repaired lots of motherboards in my working time, mostly 
replacing capacitors in the vicinity of the main processor. There they 
are used to make the 3 volts for the CPU from 5 or 12 volts. The mobos 
showed all kinds of funny behaviour. For instance, one of my own PCs 
started counting up in Excel as soon as a number was entered in a field. 
Obviously, the CPU somehow counted the ripple of the 3 volts buck converter.


Considering the high current draw of GHz processors, there are some 20 
or more amperes flowing through the little leads at, say, 50 kHz. No 
wonder the capacitors get warm, the electrolyte expands and eventually 
blows the lids. Therefore, the caps are the first thing I look at when I 
get a dead mobo. It took some time until industry reacted to that and 
made temperature proof capacitors (105° ore more).


Formerly, we also repaired PC power supplies having the same problem, 
but at today's prices that doesn't pay any more.


Peter



Am 01.02.2020 um 09:09 schrieb Gregg Eshelman via Emc-users:

Nearly all manufacturers of electronics from the 1990's into the early 21st 
century ended up getting at least some of those faulty capacitors, such was the 
massive quantity of counterfeits made with the bad electrolyte formula. Apple 
seemed to have been especially hard hit.
 On Friday, January 31, 2020, 8:54:51 PM MST, dave engvall 
 wrote:
  
  Certainly an idea to check out. Never occurred to me but the I suppose

Intel  could be victim of that kinda of fraud as easily as other
vendors. It is on tomorrows list of things to do. Tnx

Dave

On 1/31/20 7:16 PM, Gregg Eshelman via Emc-users wrote:

Have you checked the board for leaking capacitors? Usually the pressure relief 
cuts on top of the cans split open.

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Re: [Emc-users] OT - simple motor wiring

[Peter Blodow]

But this motor comes from Japan and, not knowing anything else, might 
very well be designed for the European market.

Peter

Am 20.01.2020 um 19:31 schrieb Dr. Andreas O. Lindner:

Hello, green-yellow is protected ground only in central Europe. In US it is a 
bare wire !

Just my 2 cents,
Andreas




Am 20.01.2020 um 18:48 schrieb Peter Blodow :

Isn't there something written on the green-yellow wire? In any case: don't 
connect any power to this wire, its PROTECTIVE GROUND!
Peter

Am 20.01.2020 um 18:21 schrieb grumpy--- via Emc-users:

thanks men
got it
neutral to black and blue
one side of capacitor to red
other side of capacitor to yellow
connect line to red or yellow


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Re: [Emc-users] OT - simple motor wiring

[Peter Blodow]

Isn't there something written on the green-yellow wire? In any case: 
don't connect any power to this wire, its PROTECTIVE GROUND!

Peter

Am 20.01.2020 um 18:21 schrieb grumpy--- via Emc-users:

thanks men
got it
neutral to black and blue
one side of capacitor to red
other side of capacitor to yellow
connect line to red or yellow


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Re: [Emc-users] OT - simple motor wiring

[Peter Blodow]

Hello,
this motor is a three phase induction motor where the third is supplied 
by a phase shifter condenser. This makes a unsymmetrical revolving 
magnetic field with 90 + 90 + 120 degres phase angle. This unsymmetry 
reduces efficiency, but no three phase suply is needed. It seems to be 
made according to european usage:

green-yellow = protective ground (earth)
blue = neutral, i.e. 0 V ~
black = phase (100 V~ in this case)
red = condenser 4 Microfarad 200 V~ as indicated, the other condenser 
lead is to be connected to either blue or brown depending on the sense 
of rotation desired.
Don't rely on your DC measurements, red and black are surely not a zero 
ohms connection. Put a low power light bulb in series with the supply 
source for testing to make sure there will be no short circuit.


Good luck!
Peter Blodow


Am 20.01.2020 um 15:36 schrieb grumpy--- via Emc-users:

a friend gave me this gear motor
he knows nothing about it and i can not find a wiring diagram
i have confirmed with an ohm meter that the yellow and blue wires are 
connected and the red and black wires are connected

any ideas




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[Emc-users] How come....

[Peter Blodow]

 there has been no incoming mail since May 6th?
Peter


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Re: [Emc-users] Mister/Coolant

[Peter Blodow]

I had a similar problem, coughing away as soon as I had worked on my PC 
for some time. Moving my laser printers to the adjacent room solved the 
problem. Besides, getting up and moving a few steps now and then in 
order to fetch papers from the printer next room helped my back pains, too.

Peter

Am 25.03.2019 um 20:47 schrieb Marshland Engineering:

Just spent 2-3 years wondering why I kept getting sick so often and sometimes
coughing for 3-4 hours a day. (I'm a non smoker and otherwise healthy) I spent
most of the weekend machining aly blocks with coolant splashing all over the
place on a knee mill and on Sunday night felt really sick. Finally the penny
dropped, it is the coolant in the air I was breathing in that was the cause.
The realization only came as I was doing 2 x 8 hour days machining which
exacerbated the problem.

I was booked in to see a immunologist next week for the coughing but I think I
found the source of the problem. There could be 2 issues, the composition of
the soluble oil or bacteria growth in the sump. The sump is a separate 60
litre tank and is clean but I'm getting a bacteria test done on it now.

This the reading that struck a cord. See here

https://www.osha.gov/SLTC/metalworkingfluids/metalworkingfluids_manual.html#e

Look at Respiratory Diseases.

I may not be the only one this has happened to.

Cheers Wallace.



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Re: [Emc-users] CANopen configuration files, CiA 309-3

[Peter Blodow]

Sorry, error: of course, gassing  d e creases capacity and increases 
resistance of lead cells!

Peter

Am 18.03.2019 um 10:19 schrieb Peter Blodow:
Nicklas, as soon as a lead-acid battery bubbles, it's losing water and 
the plates cover with lead sulphate, increasing capacity and intrinsic 
resistance. No, no.
I got myself a handful of cheap 74N137 stabilizers. These are made 
espacially by Motorola to maintain a constant charging voltage of 13.7 
V which is the exact limit before the gassing occurs. The current they 
deliver is limited to 1 A. I placed them inside the housing of several 
12 V DC wall warts together with a small electrolytic capacitor. The 
transformers of these little power supplies give more than 15 V AC so 
there is enough headroom for regulating.
Using those chargers the batteries of my vehicles are kept in perfect 
shape all winter and in summer, too, when the tractor is not in use. I 
have been using them for years now.

Peter


Am 17.03.2019 um 22:56 schrieb Nicklas Karlsson:
/snip/
I am familiar with CANopen communication and also to some degree 
battery charging. The old style open Lead-acid batteries should 
bubble like home brewn mash before they are done.

Nicklas Karlsson




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Re: [Emc-users] CANopen configuration files, CiA 309-3

[Peter Blodow]

Nicklas, as soon as a lead-acid battery bubbles, it's losing water and 
the plates cover with lead sulphate, increasing capacity and intrinsic 
resistance. No, no.
I got myself a handful of cheap 74N137 stabilizers. These are made 
espacially by Motorola to maintain a constant charging voltage of 13.7 V 
which is the exact limit before the gassing occurs. The current they 
deliver is limited to 1 A. I placed them inside the housing of several 
12 V DC wall warts together with a small electrolytic capacitor. The 
transformers of these little power supplies give more than 15 V AC so 
there is enough headroom for regulating.
Using those chargers the batteries of my vehicles are kept in perfect 
shape all winter and in summer, too, when the tractor is not in use. I 
have been using them for years now.

Peter


Am 17.03.2019 um 22:56 schrieb Nicklas Karlsson:
/snip/
I am familiar with CANopen communication and also to some degree 
battery charging. The old style open Lead-acid batteries should bubble 
like home brewn mash before they are done.

Nicklas Karlsson




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Re: [Emc-users] OT: Where's them fires. [Was: Re Conversational mode.

[Peter Blodow]

Jon,
some time ago I was CET of a large research plant where we had a small  
GE reactor, specialized for production of radiation, not power. We also 
used other radiation sources like gamma sources (cobalt), accelerators, 
lasers and aside from that, ultrasonic generators. Several hundreds of 
my collegues worked on the effect of ionizing radiation on biology. Some 
of my fellow scientists worked in international organizations on nuclear 
affairs. That was the preface.


A friend of mine, Dieter, worked for IAEA (Int. Atomic Energy Ass.) as 
an expert for radiation on human tissue. He told me, right after the 
Fukushima catastrophy had happened, that he had visited that site 
shortly before for a conference. During the noon break, at fair weather, 
he took a walk out to the molehead with some other participants. 
Suddenly, a wave occurred, higher than the usual ones, so that they had 
to run back to dry grounds, but all of them got we pants. He wondered 
why that nuclear plant was built so close to the sea, considering the 
fact that even without any catastrophic event the water raised up to the 
very walls of the facility. We discussed what had happened later and 
Dieter's comment was: no wonder at all to me. And that seemed to be the 
opinion of many others of the expert team, too.


The plant had been placed where it is now only under the aspect of 
economy (safety being put aside) since the pumps für cooling water would 
need much more power if the reactors would have been placed higher up or 
farther away from the coast. I am sure that everybody dealing with the 
question of locating these reactors has the same opinion.


By the way: The laboratory building where the little reactor of my 
facility was housed, producing only max. 1 MW thermal power, was 
equipped with a 630 kW Diesel generator and a large NiFe battery for 
emergency lighting, and 5 more generators are distributed around the 
campus, plus 2 Saturn gas turbines in the main energy building, so in 
case of failure of the public energy system we would be able to keep up 
full service al least for several days.


If all the nuclear power plants in the world would be constructed under 
the aspect of safety instead of economy and if this safety status would 
be maintained, i.e. adapted to technical progress, there would be no 
need for emission of any harmful substances for electric power 
production. And as we saw in Chernobyl, plutonium production is harmful 
even without applying it to the environment by means of bombs.


Peter



Am 10.03.2019 um 17:51 schrieb Jon Elson:


Am 10.03.2019 um 17:51 schrieb Jon Elson:



On Saturday 09 March 2019 23:43:26 Gregg Eshelman via Emc-users wrote:



The one problem I see as being really troublesome with the design of
Fukushima is that it apparently was incapable of being fully self
powering of all its systems at any time.
No, not true.  They had at least SEVEN Diesel generators. Crazily, 
many of them were in the basement of the buildings, where they could 
get flooded.  Also, a number of them were sea-water cooled, and when 
the tsunami hit, the first thing it did was submerge the giant sea 
water pump motor and short it out.  So, they lost all their sea water 
cooling.

Who designs a power plant
able to run for 25 years or so, producing electricity, without needing
to be refueled, that does not tap its own power generation to run all
of its electronics, pumps etc?
The problem is the turbines, alternators and their exciters are not 
designed to run over a 1000:1 power range.  This was what caused the 
big mess at Chernobyl.  In the US, we require a UPS on the most 
critical items such as primary coolant circulating pumps.  Then, we 
back that up with fast-start Diesel generators that can be on line at 
full power in under six seconds.  This stuff is REALLY expensive, 
especially a UPS that will run FOUR 1000 Hp pumps.  The Russians 
didn;t want to pay for that, so they came up with the idea they could 
run the critical loads off the inertia of the turbine-alternator set 
for a minute while the Diesels came on line. This did require the 
alternator exciter to be able to regulate the alternator's output 
voltage basically down to zero current.  Well, after making the mods 
to the exciter, they had to test it.  Doing a test like this on an 
actual, operating reactor requires extremely careful planning, and 
training of all personnel in exactly what to do, when, and what to do 
if anything diverges from the plan.


So, they scheduled this test to be done right before a refueling 
shutdown.  But, somebody didn't get the word, and shut down the 
reactor.  Uranium reactors build up a huge amount of radioactive 
iodine as a fission daughter product, and it is a strong neutron 
absorber.  So, right after you shut down the reactor, the iodine 
builds up, and poisons the reaction,  It can take a whole DAY for the 
reaction to build back up and "burn off" the iodine.  Well, they 
needed the reactor to be 

Re: [Emc-users] No clean solder flux, how to buy in Sweden

[Peter Blodow]

Nicklas,
I wrote you to get a little block of colophonium rosin for violins from 
the MUSIC STORE, and there ought to be a music store somewhere in 
Sweden. Pay it directly in cash, Swedish crowns, right over the table, 
no internet. Or ask a violinist in your neighborhood for it. And get a 
tiny bottle of 80% rum from the alcohol store. Good, strong home brew 
will do, too. No foreign payment required. And don't fuss with fir trees 
out in the woods, you'll just get sticky all over and the result will be 
hair lotion, in the best case.

Peter

Am 24.02.2019 um 18:42 schrieb Nicklas Karlsson:

On Sun, 24 Feb 2019 17:29:22 +0100
Peter Blodow  wrote:


Nicklas, although buying rosin core solder is no problem hereabouts, I
still prefer to make my own flux: Dissolve one or two large spoons full
of crushed colophonium (the cheapest quality from the music store) in a
little bottle of 95% cleaning alcohol. Probably 80% Jamaica rum works
just the same. This makes a protective liquid to apply to a PCB with a
little brush and at the same time you have the rosin wherever you are
soldering. Even smells good!
Greeetings
Peter

They have rosin at Farnell but do not sell to Sweden, really annoying.

Found another another one Electrokit, less to chose from but they accepted 
direct bank transfer and did not try man in the middle attack via billing 
company as have happened before, it works in seconds, they receive money but no 
information possible to withdraw more money. I consider it a good option to 
conclude business transactions on internet, then money is received they get the 
order but otherwise nothing happens.

Could pick some colophonium myself then I work in forest, it's the cheapest quality. I 
recognize the smell of rum, use it in the "lemonade" then I go out dancing, 
theory is it will keep teeth from rotten then there is sugar in the lemonade.


Best regards Nicklas Karlsson


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Re: [Emc-users] No clean solder flux, how to buy in Sweden

[Peter Blodow]

Nicklas, although buying rosin core solder is no problem hereabouts, I 
still prefer to make my own flux: Dissolve one or two large spoons full 
of crushed colophonium (the cheapest quality from the music store) in a 
little bottle of 95% cleaning alcohol. Probably 80% Jamaica rum works 
just the same. This makes a protective liquid to apply to a PCB with a 
little brush and at the same time you have the rosin wherever you are 
soldering. Even smells good!

Greeetings
Peter



Am 24.02.2019 um 15:28 schrieb Nicklas Karlsson:

Anyone in Sweden have experience buying no clean solder flux?

Last time I succeeded but this time only reseller I know about Elfa I failed 
registration form. I tried Ebay a few months ago but never received and now 
there is only a little bit left. Companies outside Sweden send by air freight 
and refuse to sell it. I tried only other local store I know about once but got 
sparc between pins so this is no good stuff.


Nicklas Karlsson


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[Emc-users] Metric units (was: Would this blower be useful...)

[Peter Blodow]

P.S: People who are used to sixteenths of the width of a medieval thumb, 
the weight of rocks used in throwing competitions and the volume of 
barrels way too heavy for carrying as measures should not argue 
earnestly in public about metric decimal units...

No offence! Peter Blodow

Am 24.02.2019 um 11:29 schrieb Peter Blodow:

Andy,
the use of those length units depends on the circle who uses them. 
Woodworkers use cm, metalworkers mm, opticians micrometers, nuclear 
scientists nanometers. The aim is to leave off unused zeroes, either 
in front or after the decimal point. Hectoliters are the most 
important measure of beer hereabouts because it is convenient to 
simply count barrels instead pouring beer in bulky liquid measures, 
and Austrian houewives buy their sausage and meat in Deka's.


By the way, the Gramm is very well named after a dead scientist: Saxo 
Grammaticus, living in the middle ages around 1100, famous Danish 
historian, who wrote a history of Denmark in 16 volumes. He even 
attempted to write an English grammar - English and Danish were not so 
far apart in those days -, but failed because it would have become too 
heavy for the reason of the many exceptions to its rules (at the time, 
there were such). Therefore, the unit of weight was named after him.


My best regards!
Peter Blodow
Dipl.-Phys.

Am 24.02.2019 um 10:31 schrieb andy pugh:


The hecto, centi, deci, deka  are deprecated in SI, so cm should not be
used.

I am a bit annoyed that the base mass unit is the kg, ie that it has an
embedded prefix. That is one unit that could very usefully be named 
after a

dead scientist.






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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Peter Blodow]

Andy,
the use of those length units depends on the circle who uses them. 
Woodworkers use cm, metalworkers mm, opticians micrometers, nuclear 
scientists nanometers. The aim is to leave off unused zeroes, either in 
front or after the decimal point. Hectoliters are the most important 
measure of beer hereabouts because it is convenient to simply count 
barrels instead pouring beer in bulky liquid measures, and Austrian 
houewives buy their sausage and meat in Deka's.


By the way, the Gramm is very well named after a dead scientist: Saxo 
Grammaticus, living in the middle ages around 1100, famous Danish 
historian, who wrote a history of Denmark in 16 volumes. He even 
attempted to write an English grammar - English and Danish were not so 
far apart in those days -, but failed because it would have become too 
heavy for the reason of the many exceptions to its rules (at the time, 
there were such). Therefore, the unit of weight was named after him.


My best regards!
Peter Blodow
Dipl.-Phys.

Am 24.02.2019 um 10:31 schrieb andy pugh:


The hecto, centi, deci, deka  are deprecated in SI, so cm should not be
used.

I am a bit annoyed that the base mass unit is the kg, ie that it has an
embedded prefix. That is one unit that could very usefully be named after a
dead scientist.






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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Peter Blodow]

Chris,
just think of the radioactive people like the Curies and Bequerel (rad. 
activity),  Gray (energy dosis), Sievert (man-equivalent dosis). Then 
there was Georg Ohm for el. resistance and, for what his name is read 
"Mho" backwards in the US, Siemens for conductivity. Then, most 
important, Coulomb for charge, Weber for magnetic flux, Tesla for the 
magnetic field power and, for chemists, since 1999 Katal for katalytic 
force (joke, George F. Katal didn't exist). Celsius should be replaced 
by Kelvin - same scale units, but relative to absolute zero (-273°C).
Sorry to say, this system highly satisfies scientists, but in practical 
lab or shop use it's annoying sometimes, mostly because of bulky numbers 
and many zeroes like Farad, Pascal or Kelvin.

Peter


Am 16.02.2019 um 20:18 schrieb Chris Albertson:

Notice that now-days many of the "standard" SI units are named for
long-dead scientests

Volt,
Ampere,
Watt,
Henry,
Farad,
Joule,
Hertz,
Newton,
Pascal,
Celsus,
Kelvin,

Likely a lot more I can't remember.




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Re: [Emc-users] Would this blower be usefull as a low pressure mister for this 6040

[Peter Blodow]

Andy, you forgot that blood pressure in Europe is measured in mm of 
mercury...

Peter

Am 16.02.2019 um 12:47 schrieb Andy Pugh:



On 16 Feb 2019, at 09:21, Erik Christiansen  wrote:

as lb/in^2 isn't right

It can be, if you measure oil consumption in slugs.

We use hPa a lot at work. It annoys me.
In fact the same software in various places uses hPa, kPa, MPa, bar, psi and 
inches of mercury!

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Re: [Emc-users] WeTransfer? Anybody know anything about them?

[Peter Blodow]

Gene,
while writing all this description you could easily have taken a couple 
of pictures and mailed them instead. If I remember right, some time ago 
you promised some more pics, anyway It's hard to follow and imagine 
what you are doing and what your problems are without knowing the 
merchandise you are talking about. E.g., most of the world is not 
familiar with US brand names.

Peter


Am 27.01.2019 um 09:21 schrieb Gene Heskett:

On Sunday 27 January 2019 02:47:51 Roland Jollivet wrote:


Hi Gene

Do you want to look at these two manuals? There might be useful info
as in similarities;

https://hobbytronics.co.za/Content/external/1159/YL%20Manual.pdf
https://hobbytronics.co.za/Content/external/1159/vfd.pdf


They have zero resemblance to this one, which is all on one pcb, about 6"
square, fastened to a 5/8" thick block of ALU around 6.6" square.  No
cabinet. just mounted in an overweight steel box that did have a row of
4 TH6560 drivers and a puny power psu for the steppers, with the A axis
plugged in it was loaded down to 14 volts, but the label on the supply
said 24 volts.  Thats all been boxed up. So theres now a small 24 volt
to run the cooling fan, but will have an old original cnc4pc C41 in its
big box by late tomorrow.






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Re: [Emc-users] Spindle Encoder AEDR-8300 Encoder Ring

[Peter Blodow]

Hello David,
how did this funny gear ratio come to be? Assuming it's tooth gears or a 
belt drive, can't you change it to 55/55 or 68/68 or some other 1/1 
ratio, which would solve this problem? Years ago, I made drawers full of 
gears for cases like this, letting my little mill make gears for itself, 
the large mill  and the lathe with MS Excel and a home made stepper program.

Peter


Am 29.11.2018 um 06:52 schrieb David Berndt:

Alright, Dragging this back up.

A knockoff Omron encoder showed up in the mail, well I assume It's a 
knockoff at this price. Mounted it, wired it up. But it's on the back 
of the mill and geared 68/55 to the actual spindle output.


So now the question is, what do I setup scaling to? Set scaling so 
that X pulses = one rotation? That seems to be the correct thing based 
on my reading. What if anything do I do with my index pulse then? It 
fires every 2000 counts, which is useful for keeping track of lost 
counts perhaps but not much else, as it doesn't repeat based on 
physical location on the spindle every rotation. Disconnect it and run 
a real once per rotation index? Contrive some sort of index scaling 
using oneshot or something crazy like that?


Regards,

Dave


On Thu, 01 Nov 2018 06:30:19 -0400, andy pugh  wrote:


On Thu, 1 Nov 2018 at 03:31, David Berndt  wrote:

That doesn't sound particularly hopeful for me and my plans. I guess 
maybe

a more traditional/proven approach of a through-beam sensor with
interrupting disk and much much lower resolution encoder ring with
drilled/milled holes might be the way to go.


I think that the AEDR _ought_ to work. They are a commercial product,
after all.

Part of my problem was that I had no adjustment for sensor-to-target
spacing, and to make matters worse I had a sensor and a target on both
sides of the PCB (The PCB was sandwiched between two encoders, because
of the wacky idea I was experimenting with).

I mainly gave up because my (scratch built) motor turned out to be
rather too weak.



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Re: [Emc-users] No mail received?

[Peter Blodow]

I did, even wrote a diploma thesis on that subject, but this was some 40 
years ago... Since then, I rather managed people doing research on it.


Peter

Am 19.10.2018 um 19:39 schrieb Nicklas Karlsson:

I am still here, working on control theory right now. Anybody who have a taken 
any courses of in control theory on University?






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[Emc-users] No mail received?

[Peter Blodow]

Gentlemen,
I haven't got any mail from this list since Oct.10th. How come? Is there 
something wrong with the EMC server, or is it my provider? Or are there 
no more problems (or successes) to report?


Peter


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Re: [Emc-users] Possibly useful keyboards

[Peter Blodow]

Gentlemen, treating transparent plastic material is tricky, but not hard 
to do. For instance, in my company's shop we sometimes had to make 
covers (hoods) for scientific laboratory equipment. Polycarbonate, 
whatever its trade name may be (Macrolon in Germany), can be bent cold 
like sheet metal if not too thick.


Plexiglass (PMMA, polymethyl methacrylate) can be bent warm and glued 
with pure acetone or acetone with a little PMMA dissolved in it. 
Straighten the sheet sides with a mill, no slits or chinks are allowed. 
Screws are forbidden. We made ourselves thin heating rods in different 
lenghts which were placed beneath the bending line for several minutes, 
then bended by hand. Fixing the angle until cold is necessary. If more 
covers of same type are to be produced, deep drawing might be useful. 
Make a plywood fixture consisting of a flat plate and a second plate 
lying on top of it with a hole of the desired shape cut out, all inside 
covered with velvet foil to avoid scratches. Then hang the PMMA sheet in 
a 200° C heating cabinet until soft enough, quickly clamp it between the 
plywood plates and blow the sheet up with compressed air. We once made 
bowler hats this way for the public at an exhibition.


Peter




Am 02.08.2018 um 20:28 schrieb Gene Heskett:

On Thursday 02 August 2018 13:55:54 Dave Cole wrote:


On 8/2/2018 1:32 PM, Gene Heskett wrote:

On Thursday 02 August 2018 12:37:36 Dave Cole wrote:

Why not put a standard keyboard into a plexiglass box with an open
side towards the operator?

You can still see the keys if needed if you make it out of clear
plexi.   A sheet of 1/4" plexi, a table saw, and some plexi glue is
all you need.
When it gets scratched up, make another one, or buff it out.

Dave

Thats a thought. But I'd probably use the bullet proof stuff. I'll
see if theres glue for it next time I get to Lowes.

Thanks Dave.

Are you thinking of Lexan/Polycarbonate?

I know that Menards sells plastic glue but its in small quantities. I
suppose one could be screwed together if the plastic was thick enough.

I know that drilling Plexiglass can be tricky as it tends to
fracture/shatter if you are not careful.

I think that Lexan is more forgiving but more costly.


Thats the stuff, but couldn't recall the name, (oldtimers?) what I do
know is that it drills a lot like stainless. Perfectly sharp drills and
lots of pressure on them. I can't recall ever shattering it though.

It can be bent but takes a surprising amount of heat to soften it enough
to bend.

thanks Dave.


Dave






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[Emc-users] no news any more?

[Peter Blodow]

How come I have not read any news for 5 days now? Is there something 
wrong with servers etc., or are there really no problems around??

Peter

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[Emc-users] Fwd: Re: tap makers vs bolt makers

[Peter Blodow]

 Weitergeleitete Nachricht 
Betreff:Re: [Emc-users] tap makers vs bolt makers
Datum:  Thu, 28 Jun 2018 00:06:52 +0200
Von:Peter Blodow 
An: Gene Heskett 



Gene,
there are DIN threads that are printed in bold type in the DIN list, the
rest is not recommended fur use. Such include M2.3, M3.5, M4.5, M7, M9,
M11, M14 etc. Except for M3.5 which is widely used by electricians for
cable fasteners in plugs etc., they are not used by industry and
therefore the corresponding taps and thread cutters are not included in
standard sets. The French use M7 in car applications but they are widely
known for their queerness ;-)
The reason is that for those unusual sizes there are partially no
strength recommendations.
Peter

Am 27.06.2018 um 23:47 schrieb Gene Heskett:

Greetings all;

As I work my way thru the smaller taps in some of my older tap kits, I'm
finding a puzzle. I haven't been able, locally or online, to by an odd
sized metric bolt above the even numbered 6.  But I sure have a pile of
pristine, never been dirtied 7mmx1.0 and 9mmx1.25's in the tap box now.

Is this a conspiracy, and if so whats the point?

Puzzles indeed.

Thanks all.



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Re: [Emc-users] Newall DRO integration

[Peter Blodow]

Chris, thank you. The tilde was transformed to /∼ .
Peter

Am 22.05.2018 um 21:27 schrieb MC Cason via Emc-users:

On 05/22/2018 02:02 PM, Peter Blodow wrote:
Sorry, Chris, I get a "Not Found"-Error with your caltech link 
without any further comment.

Peter


  It must be a code page error.  It worked after I deleted the tilde, 
and then added it back in.

http://www.cds.caltech.edu/~murray/amwiki/index.php?title=Main_Page




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Re: [Emc-users] Newall DRO integration

[Peter Blodow]

Sorry, Chris, I get a "Not Found"-Error with your caltech link without 
any further comment.

Peter

Am 22.05.2018 um 18:10 schrieb Chris Albertson:

I just got a copy of "Feedback Systems - An Introduction for
Scientists and Engineers, Karl Johan °Aström and Richard M. Murray"

The book is FREE and pdf format at http://www.cds.caltech.edu/∼murray/amwiki

It is an actual set book that seem to be exactly what anyone working
in this field needs to know.  I'd say it is not is mathematically
oriented as a real university control theory book and certainly well
above the hobby level.  It assume some know age of Calculus but not a
lot.  Pretty much what the title says.   But it covers feedback, not
just motion control. so things like op-amps are covered.   But you
need to know that to if designing control circuits

I'm using stepper motors but already have DRO scales.   It seems that
I should be able to combine open loop counting with closed loop linear
sensors.

Suggestion above were good, thanks, because they contain a solution I
had not thought of, drive "I" with different data than "PD"

On Tue, May 22, 2018 at 6:44 AM, John Kasunich  wrote:


On Fri, May 11, 2018, at 11:16 PM, Chris Albertson wrote:

I looked at the unit.   It seems like a good idea.  It uses inputs from
both the motor's shaft encoders and another encoder on the object that is
being moved, like a linear encoder on the table.

Question:  Let's say I wanted to do this myself.   Is there a method that
"everyone" in the machine tool industry uses for combining the reading of
multiple encoders?  If not it seems like the perfect application for a
Kalman filter.

But maybe you don't combine them but use the linear DRO for position loop
and the motor shaft encoders for velocity.

This is a common problem I think with robot arms.  The joint has an angle
sensor but the motor has a shaft encoder.   So the control loops might be
nested.

It reminds my the old saying the "A man with a watch knows what time it is,
a man with two watches is never sure of the time."


We did something like this several years ago at Stuart's shop in Wichita, on a 
big Giddings and Lewis boring mill.

We used two PID loops, with their outputs summed.  The position command went to 
both loops.  The feedback for one loop came from the motor encoder, and the 
feedback for the other loop came from the linear scale.

The motor loop was tuned as normal, except that the I-gain was kept at zero.
The linear scale loop was tuned using ONLY I-gain.  So the linear scale loop 
corrected the fairly small steady-state errors due to things like the lead 
screw heating up (10 foot long screw, it adds up).  It also compensates for 
backlash in the screw, and if there is much of that it leads to disturbances on 
direction reversal.  Isn't going to fix a clapped out machine, but can improve 
the accuracy of a tight machine.


--
   John Kasunich
   jmkasun...@fastmail.fm

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Re: [Emc-users] Zeiss touch probes

[Peter Blodow]

Which photo? And a ROM is a good way to hide secrets, chapeau!.
Peter

Am 11.05.2018 um 11:11 schrieb andy pugh:

On 11 May 2018 at 07:33, Peter Blodow <p.blo...@dreki.de> wrote:

Andy,
Zeiss uses the "switching" function as a major argument in advertising this
probe, so measuring the bare resistance wouldn't be satisfying. There must
be a feature you didn't find when destroying your probe.

There is nothing clever in the probe head, just the piezo and two resistors.

In the interface unit that the probe connects to (there is one in this
photo) there is a _lot_ of stuff including what looks like a big old
ROM chip.




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Re: [Emc-users] Zeiss touch probes

[Peter Blodow]

Andy,
Zeiss uses the "switching" function as a major argument in advertising 
this probe, so measuring the bare resistance wouldn't be satisfying. 
There must be a feature you didn't find when destroying your probe. It's 
digital this way. Unfortunately, on the Zeiss homepage, when selecting 
the catalog with detailed description of the RST-P's functionality they 
answer the page is currently not available.

Peter




Am 11.05.2018 um 00:08 schrieb andy pugh:

On 10 May 2018 at 21:09, Andrew  wrote:


The interface is a 5-ring connector like a jack plug.
I haven't managed to figure out which ring is which, and Zeiss are not
saying.

So it must be two NC contacts and the rest for the piezo.

Yes, I figured that much out, the question was which is which.

I damaged one trying to get it apart, so decided to simply part-off
the top on the lathe. (They really are not designed for disassembly).

It turns out that the NC contacts are part of a resistor network.
There is a 90k across the contacts and a 470k in series. That was why
my beep-test didn't work (I had not realised that putting my
multimeter in beep mode also locks it in single-ohms mode, so the
display was showing nothing.)

So, working purely as a touch-probe they show 76kΩ when un-triggered
and 90kΩ when triggered. So I need to find a way to convert that to a
digital input for LinuxCNC.

(I may well just ignore the piezo element)




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Re: [Emc-users] Ferrite on a shielded cable

[Peter Blodow]

Andy,
if the shield of your cables is any good, there should be no electric 
field outside of it (that's the purpose of coaxial shielding), thus, no 
interference, so further measures like ferrite rings etc. are useless at 
this point.
Your 4 servos draw current from the power supply. The common intrinsic 
resistance of this current source will be passed by all of the 4 current 
branches, so their votlage drops are superimposed, and this way all the 
drives recieve this voltage as a common "noise" signal. The amount of 
influence of their function depends on individual properties of the 
drive circuits. The only way to reduce this noise influence is reducing 
the power supply's intrinsic resistance by blocking the output voltage 
with capacitors (electrolytics paralleled with small ceramics) right at 
the point where the cables leave the power case. There should be no 
piece of a common current path for the 4 drives. Chokes (i.e., coiled 
wire with an iron or ferrite core) will increase the resistance and may 
only be used in the individual leads to the drives after their 
separation from the supply box. They might block high frequency noise at 
this point and separate the 4 AC-like which can be favourable.

Peter


Am 08.05.2018 um 13:20 schrieb andy pugh:

I have concluded that I have a problem with noise from my (shared by 4
drives) servo power supply.
The STMBL drive controlling the 4th axis suffers from CRC errors with
the smart-serial control signals and shuts down.

By the simple expedient of running it from a separate PSU this problem
seems to be eliminated.
(It ran fine all night yesterday).

I don't see this as a good long-term solution, so I want to get rid of
the noise in the DC supply. This seems like a job for a choke, but the
cables have a braided shield.

Should the shield pass through the choke, or should I strip the area
where the choke is installed?




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Re: [Emc-users] wiring. axis move?

[Peter Blodow]

Aram, an aluminum box will not shield magnetic noise, you would need 
heavy iron walls for that. Aluminum - as any electrically conductive 
material - will only help keeping electrostatic noise out, but for this 
purpose, it must be connected to a good ground (earth). Telling from 
your description, the box is connected to some potential other than 
ground, and/or the mains leads carry some other voltage than just zero 
and 115 VAC. Check the voltage supply carefully, you may even be in 
danger of an electric stroke!
What kind of voltage meter did you use to measure those 30 V AC? Try to 
repeat this measurement with a load, like a light bulb,connected 
parallel to the meter! There may be just some stray voltage if the meter 
is sensitive enough, meaning that it may have a very high impedance to 
show harmless stray potentials. In any case, your mains supply is 
suspicious.


Peter

Am 24.03.2018 um 21:28 schrieb a k:

Hello
It is sound strange but that what I have.
I build box 3 3 3 feet
And put all motor drive inside of it.
Why ?
This box build out of aluminum plate and holds together with bolts.
When all drive inside I have problem ==axis move by them self.
When I pull out all motor droves, they all working good.
I build this box to protect against outside magnetic  noise  = was logical
Right ?
But it is not what real situation .

Something not ok,
Was I wrong with building aluminum box?













On Mar 23, 2018 5:12 PM, "Gene Heskett"  wrote:


On Friday 23 March 2018 19:24:58 a k wrote:


I am in portland .
30 to 40 v ac I read between water pipe _ which is real ground and
ground on the outlet pin that has cylindrical shape.
Is this normal?


No!

But inspect that pipe, every inch of it all the way to real dirt. There
may be a plastic connector, inserted someplace which will break that
good ground connection. If so, jumper it from one side to the other with
a solidly bolted connection using at least 10 gage solid copper wire.

Water, depending on its purity is at best a poor conductor, although it
can kill you, and really pure water (distilled or deionized) is an
excellent insulator.


On Mar 23, 2018 4:03 PM, "Chris Albertson" 

wrote:

Aram,

Where to you live?  In North America, UK, ?

Building wiring conventions are different in different places. but
in general your system, taken as a whole needs to be connected to
exactly ONE ground reference.  No more no less.  The best way to
place a bolt some place and define that is "The Ground"

And all static grounds are to be stacked on this single bolt.


If you have 30+ volts AC on a ground pin  on an outlet you have a
problem that needs to be looked at by a good electrician.   It
should never be that high.   Some cases are thinks like corosion and
loose connections.   One cause I that think of is that in some older
buildings they were allowed to use metal conduit as the ground
connection.  Works OK at first but metal conduit rusts ofter time.
Now day's we are required to pull a group cable

with its own static ground in this cable.


On Fri, Mar 23, 2018 at 2:04 PM, a k  wrote:

hi
i reassemble my lcnc mill, and i found that axis move by them
self. i think it is something to do with static electricity.
i found ground - and when grounded lcnc body of machine - breaker
turn

off.


i measure with dc voltage between machine and ground 2. vdc and
when i measure ac voltage between lcnc machine and ground it was
35 v AC.

i know that when use real ground like a water pipe and ground in
outlet there always will be current they always be 30 v ac.
can it cause problem?

Yes, and while I'm commenting on a plastic connector, its entirely
possible that a teflon taped water pipe joint could be an insulator.


thanks
aram

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Redondo Beach, California

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"There are four boxes 

Re: [Emc-users] non-contact position sensors, surprisingly good performance.

[Peter Blodow]

This mail has been sent to sourceforge this morning and was returned 
without reason. Therefore, I forward this to your own mail address. P.


Andy, better keep fingers off that sort of thread (Panzergewinde, 
Sta-Pa-Rohrgewinde). It was widely used, but only for unimportant 
purposes (like protecting cables dangling form the ceiling to a 
machine). The cutters had square outer outline and nobody had holders 
for them, so they used monkey wrenches and pliers to turn them! Besides, 
the norm says that the thread is cut only part way into the pipe wall so 
that they are flat outside, having no sharp tips and little holding 
power. The threads may also be hard to catch at mounting time, standing 
on a ladder below the ceiling. And the pipes were rolled and seam 
welded, leaving a sharp burr inside that might cut cable insulation. 
This whole stuff is only for dirty purpose and no good craftsmanship. I 
used up my last pipes to make handles for alu pouring equipment because 
they will fit plastic bicycle handles.


Peter


Am 20.02.2018 um 18:38 schrieb Andy Pugh:



On 17 Feb 2018, at 15:26, Peter Blodow <p.blo...@dreki.de> wrote:



Am 16.02.2018 um 06:32 schrieb Chris Albert

I think this thread size os used for those very thin rings used for
electrical  jacks and toggle switches.  The ring nuts are only 2mm thick so
they need an ultra fine pitch.

...which usually is 0.75

Another way is to use a very large thread angle.
This one is metric on diameter, 80 degree thread angle and TPI pitch.

https://en.m.wikipedia.org/wiki/Panzergewinde


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Re: [Emc-users] non-contact position sensors, surprisingly good performance.

[Peter Blodow]

Am 16.02.2018 um 06:32 schrieb Chris Albertson:
/snip/

/snip


I think this thread size os used for those very thin rings used for
electrical  jacks and toggle switches.  The ring nuts are only 2mm thick so
they need an ultra fine pitch.

...which usually is 0.75 mm.

Peter

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Re: [Emc-users] 240V single phase input vfd

[Peter Blodow]

Gregg,
the 5 Hz is because - at least hereabouts - the VFDs are used mostly for 
ventilation drives and they start with low speed and then accelerate for 
noise reasons. Maybe there are also safety reasons.

Peter

Am 03.01.2018 um 00:43 schrieb Gregg Eshelman via Emc-users:

The one I have on my old Monarch lathe, to start in higher speed gears I have 
to slip the clutch a bit or it'll quit with an overcurrent fault. In lower 
gears I can just pull the lever.
There may be some programmable adjustment that can fix that, but it works as 
it's setup now. One crazy thing was out of the box it was set to a frequency of 
5Hz instead of 60. I'm not worried about any possible negative effects on the 
1943 vintage 3 horsepower motor, I don't use it a lot. A newer motor with lower 
rotating mass might start easier.
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Re: [Emc-users] Ethercat master --> DieBieSlave LAN9252

[Peter Blodow]

Am 13.12.2017 um 16:57 schrieb Dave Cole:


See the Suchen button.  I think that is "search" in German.


German suchen corresponds to engl. seek, old engl. seacan.
Peter

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Re: [Emc-users] oddball job

[Peter Blodow]

Gene,
I assume that you have the gear which the one in question is to mesh 
with. Knowing the number of teeth desired (11), you should be able to 
find out or calculate the gear's properties, get a brass (or plastic) 
blank and produce the item on a mill (if you have a dividing head). Will 
be faster than guessing about old factory cooperations, looking around 
in catalogues or digging in junk yards. This way, I made the complete 
set of missing gears for my small precision mill on this very mill 
itself. I used slabs cut from hydraulic piston rods, manganese steel.


Peter


Am 23.11.2017 um 20:37 schrieb Gene Heskett:

On Thursday 23 November 2017 14:16:27 jrmitchellj . wrote:


Before going to all the trouble, I would consult the Boston Gear
catalog.


Humm, that means I'll have to know exactly what it is and all I know atm
is that its 11 teeth. He thinks anyway.

Would anybody at Boston Gear know exactly what it is? Like the chances
they made the OEM part for caddy?


Happy thanksgiving!


You too Ray. Thanks.


Ray

--J. Ray Mitchell Jr.
jrmitche...@gmail.com



The dogmas of the quiet past, are inadequate to the stormy present.
The occasion is piled high with difficulty, and we must rise with the
occasion. As our case is new, so we must think anew and act anew. We
must disenthrall ourselves, and then we shall save our
country.*Abraham Lincoln
*, *Annual
message to Congress, December 1, 1862*
*16th president of US (1809 - 1865)*

On Thu, Nov 23, 2017 at 11:06 AM, Gene Heskett 

wrote:

Greetings all;

A friend of the next door neighbors kid brother collared me at the
grocery store today.  Seems he has acquired an 88 caddy that has
spent the last 30 years parked in a garage, collecting zero miles.

But it has just broken some teeth off the speedometer gear in the
transmission, and without that data the transmission is acting
berserk and has rendered a showroom caddy un-driveable.

And he wants me to see if I can restore this broken, probably
plastic or phenolic gear.

I have a hunch that as soon as I get this encoder working, then I
had better get to work on my 4" rotary table as I'll need it to cut
fresh teeth in the replacement plastic, or maybe even brass.

Caddy has been queried about it, but the last of those service parts
was sold out in 2008 according to their reply.  So its make a new
one, or else junk the caddy.

If I elect to do brass, that will probably need a specially ground
tapered mill or a single tooth flycutter. Does anyone know where one
might obtain a drawing for such a tool?  Or should I jut try to
duplicate something that fits the remaining teeth on this one when
it arrives?

Thanks guys.

Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
  soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 


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Cheers, Gene Heskett



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Re: [Emc-users] No more mails

[Peter Blodow]

PS: Strangely, they didn't want a password, nor did I have to create one 
when re-subscribing. (Couldn't remember after all those years, anyway).

P.


Am 31.08.2017 um 08:32 schrieb Peter Blodow:

Stuart, Cecil,
yes, there was a memo to renew the subscription, Yes, I also ignored 
it the first time. Then, there was a discussion on the list wether it 
was spam or not. At last, I decided to follow the memo and 
re-subscribed, months ago. Apparently, these things aren't executed so 
stringently by sourceforge. What worried me was that at the same time, 
our telephone- and data connection to town failed for weeks (phone is 
still down) so it was hard to determine the cause.


Greetings
Peter

Am 31.08.2017 um 00:12 schrieb Stuart Stevenson:

Victim here also.
I saw the memo, thought it was a scam of some type, ignored it and then
later had to resubscribe.
No harm, no foul, better to be cautious than sorry.

On Wed, Aug 30, 2017 at 4:20 PM, Cecil Thomas <wctho...@chartertn.net>
wrote:


Peter,
The same thing happened to me and I had to rejoin.
Apparently some of the list members got messages from Sourceforge 
asking

them to confirm their membership and some didn't.  Those who did not
confirm their membership ( which would be those who never got the memo)
were dropped from the list.  If you want to catch up on what has 
been on

the list since you were dropped you can scan the archives.

(fellow victim)
Cecil


At 04:50 PM 8/30/2017, you wrote:


Gentlemen,
the email printed below came back for the reason that I wasn't a 
member
of this mailgroup. However, I subscribed as early as 2009! I was 
forced to
join once more, probably with the result that I am considered a 
newbie now.

Peter


Gentlemen,
since Aug. 2, I have not seen any mails from LinuxCNC (EMC). Is there
something wrong with my subscription, or is everybody on vacation? 
Did you
change the mail address? In addition, our village has repeatedly 
been cut
off from communications because of cable failures on the way from 
town to

us here way out.



Greetings
Peter Blodow




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Re: [Emc-users] No more mails

[Peter Blodow]

Stuart, Cecil,
yes, there was a memo to renew the subscription, Yes, I also ignored it 
the first time. Then, there was a discussion on the list wether it was 
spam or not. At last, I decided to follow the memo and re-subscribed, 
months ago. Apparently, these things aren't executed so stringently by 
sourceforge. What worried me was that at the same time, our telephone- 
and data connection to town failed for weeks (phone is still down) so it 
was hard to determine the cause.


Greetings
Peter

Am 31.08.2017 um 00:12 schrieb Stuart Stevenson:

Victim here also.
I saw the memo, thought it was a scam of some type, ignored it and then
later had to resubscribe.
No harm, no foul, better to be cautious than sorry.

On Wed, Aug 30, 2017 at 4:20 PM, Cecil Thomas <wctho...@chartertn.net>
wrote:


Peter,
The same thing happened to me and I had to rejoin.
Apparently some of the list members got messages from Sourceforge asking
them to confirm their membership and some didn't.  Those who did not
confirm their membership ( which would be those who never got the memo)
were dropped from the list.  If you want to catch up on what has been on
the list since you were dropped you can scan the archives.

(fellow victim)
Cecil


At 04:50 PM 8/30/2017, you wrote:


Gentlemen,
the email printed below came back for the reason that I wasn't a member
of this mailgroup. However, I subscribed as early as 2009! I was forced to
join once more, probably with the result that I am considered a newbie now.
Peter


Gentlemen,
since Aug. 2, I have not seen any mails from LinuxCNC (EMC). Is there
something wrong with my subscription, or is everybody on vacation? Did you
change the mail address? In addition, our village has repeatedly been cut
off from communications because of cable failures on the way from town to
us here way out.



Greetings
Peter Blodow




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Re: [Emc-users] No more mails

[Peter Blodow]

Gentlemen,
the email printed below came back for the reason that I wasn't a member 
of this mailgroup. However, I subscribed as early as 2009! I was forced 
to join once more, probably with the result that I am considered a 
newbie now.

Peter


Gentlemen,
since Aug. 2, I have not seen any mails from LinuxCNC (EMC). Is there 
something wrong with my subscription, or is everybody on vacation? Did 
you change the mail address? In addition, our village has repeatedly 
been cut off from communications because of cable failures on the way 
from town to us here way out.




Greetings
Peter Blodow



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Re: [Emc-users] change of subject, brass or copper?

[Peter Blodow]

Erik, I have also bearings with an outer ring of toroid surface (no 
edges), but never used them.

Peter

Am 16.07.2017 um 10:38 schrieb Erik Christiansen:

On 16.07.17 09:26, Peter Blodow wrote:

Gene,
learning from the experience from machining in our shop, I made my (own
private) steady rest with small ball bearings right from the beginning (and
also the moving rest which can be bolted to the carriage). They also cause
some minor traces on the workpieces, but these can be polished away.
Peter

Peter,
Maybe a brass tyre, loctited or shrunk onto the bearing, could alleviate
that. I've only used brass-tipped fingers on steady rests, and found
them quite good, with a bit of oil and modest speed.

Erik

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Re: [Emc-users] change of subject, brass or copper?

[Peter Blodow]

Gene,
learning from the experience from machining in our shop, I made my (own 
private) steady rest with small ball bearings right from the beginning 
(and also the moving rest which can be bolted to the carriage). They 
also cause some minor traces on the workpieces, but these can be 
polished away.

Peter


Am 16.07.2017 um 03:46 schrieb Gene Heskett:

Greetings all;

My steady rest has steel sliders, which will not do for working on
finished parts.  So I need to order a foot of 1/2x1" brass or copper to
make some more better shoes.

Which will do the least damage to a pre-finished part, such as the fairly
high polished SS barrel?  Brass or copper?

Thanks everybody.

Cheers, Gene Heskett



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[Emc-users] A phoney from Sourceforge?

[Peter Blodow]

Hello Gentlemen,
I just got a message, seemingly from sourceforge (sourceforge at 
slashdotmedia.com), litterally mentioning emc-users as my mailing list, 
with the urgent wish to confirm my subscription with sourceforge, 
otherwise it would be cancelled by June 29th. The link given looks 
somehow fishy (starting with sourceforge.net, followed by lots of 
numbers and special characters) and contains my email address at the end.


I can't remember having a subscription with sourceforge, or do I need 
one in order to participate in this list? I'd rather strongly suppose 
this is some sort of spoof to make me contact that link, maybe to 
confirm the existence of my email address or make me pick up a virus. 
Has anybody else received such a message?


Greetings
Peter Blodow

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Re: [Emc-users] how to configure motors in pncconf?

[Peter Blodow]

Long time ago, pncconf had an error, so that it made 5 steps to a cycle 
instead of 4. This made the same symptoms at the steppers as you 
picture. What version of pncconf are you using?

Peter Blodow

Am 23.04.2017 um 14:50 schrieb Valerio Bellizzomi:
> On Sun, 2017-04-23 at 08:21 -0400, Todd Zuercher wrote:
>> With a stepper that usually means the motor is stalled usually because of 
>> too high velocity, acceleration, or a wiring problem (bad connection on one 
>> phase).
> the motor moves accordingly when I jog in Axis interface, and the
> microstep scale is ok
>
> I think if a bad connection was there, the motor could not move
>
>
>
>
>> - Original Message -
>> From: "Valerio Bellizzomi" <vale...@selnet.org>
>> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
>> Sent: Sunday, April 23, 2017 2:46:03 AM
>> Subject: Re: [Emc-users] how to configure motors in pncconf?
>>
>> On Sat, 2017-04-22 at 10:24 +0200, Valerio Bellizzomi wrote:
>>> On Fri, 2017-04-21 at 11:56 +0100, andy pugh wrote:
>>>> On 21 April 2017 at 11:45, Valerio Bellizzomi <vale...@selnet.org> wrote:
>>>>> The X stepgen is show as 5 in the tab, and as
>>>>> hm2_5i25.0.stepgen.05.counts in the test window, and it is changing
>>>>> while I press the movement button
>>>> I think this is the problem.
>>>>
>>>> https://github.com/LinuxCNC/hostmot2-firmware/blob/master/src/PIN_7I76x2_34.vhd
>>>>
>>>> Shows stepgen.05 to be on the expansion connector, not the DB25.
>>>>
>>>> Configure the X axis to be on Connector 3.
>> Hello,
>> What does it means when motor vibrates and makes sounds ?
>>
>> The test window of pncconf is limited to 5000 and has disabled arrow
>> control, that means we can't set nothing higher than 5000. So, once
>> generated the config files with pncconf, I have edited the files by
>> hand, and now I am testing with Axis.
>>
>> now I have set the parameters as follows:
>>
>> step on-time 5000
>> step space 5000
>> dir setup 1
>> dir hold 1
>>
>> When the motor is at rest (before any jog command within Axis), it does
>> not vibrate. But once a command is given, when it goes at rest again it
>> vibrates and makes sounds, until I disable from the Axis interface.
>>
>>
>>
>>
>> --
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>
>
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Re: [Emc-users] Cast Bracket for FHA-25 Harmonic Actuator.

[Peter Blodow]

Sorry, I just get a white screen after a lot of downloading. Must be an 
autocad-specific file format!?
Peter

Am 03.04.2017 17:37, schrieb andy pugh:
> I have just handed over the pattern to the foundry for a right-angle housing.
> http://a360.co/2oQX7Ct
> is the 3D model of the pattern. The inner bore will need to be
> machined to suit the harmonic drive.
>


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Re: [Emc-users] Thoughts on extending the life of the microsd's.

[Peter Blodow]

Please, could someone explain to a poor physicist what noatime and Mutt are?
Peter

Am 12.03.2017 16:34, schrieb dragon:
> For about three years now, I know of no other applications that has
> issues with noatime other than Mutt. Everyone always says 'but it breaks
> programs like Mutt' but in reality these days, my experience has been
> that it only breaks Mutt. There used to be more applications that it
> caused issues with but mostly they have either been patched or
> deprecated. I have been using noatime for about 5 years now and have
> experienced no issues with it on everything from desktops to servers to
> dedicated appliance type setups for realtime audio and radio automation.
>
>  From what I have read, SSHFS has a bit more overhead in comparison to
> NFS. In fairness though, I have never personally tested for it. Perhaps
> someone else on the list has more info. On a desktop or server I
> wouldn't sweat it too much but on the Pi it could make a difference. You
> could just try both and see what happens. I have used both of them,
> depending on the situation, but have never compared the impact on system
> performance. Personally I wouldn't encrypt the remote mount on a secure
> LAN when using the Pi unless sensitive data was involved. That just
> seems like a lot of extra clock cycles for the little Pi, but perhaps I
> am worrying about nothing.
>
> Amanda... check the perms on the directory itself, in addition to what
> is set up for the mount.
>
>
>
>
> On 03/12/2017 08:23 AM, Gene Heskett wrote:
>> On Sunday 12 March 2017 08:39:03 Erik Christiansen wrote:
>>
>>> On 11.03.17 16:42, Gene Heskett wrote:
 On Saturday 11 March 2017 12:02:36 dragon wrote:
> I doubt that you will ever hit the end of life on a quality SD
> card, especially a large size one. The writes that you are doing,
> and thus the number of blocks, are TINY compared to what the cards
> were designed for... photos and videos. You can also run a flash
> file system instead of ext4 if you like. Checking that noatime is
> set for the filesystem would have a far greater effect than all of
> the writes that you will ever do in daily use. While true at one
> time, this whole wearing out flash storage thing is almost a non
> issue for use cases like this nowdays.
 How do I check that, and with the rube goldberg's hired hand boot
 configs used on the pi, how would I set the noatime option?
>>> AIUI, as relatime has long been the default (since kernel 2.6.30), you
>>> don't really need to do anything. Given that relatime only updates the
>>> access time if the previous access time was earlier than the current
>>> change time, there'll be slightly more writes than with noatime, but a
>>> lot less than with neither - and noatime breaks applications like
>>> mutt.
>>>
>>> If you do want to change it, then in /etc/fstab, add noatime to the
>>> comma-separated options in column 4. Before the relatime kernel
>>> default change, that was said to give a 10% performance boost. It
>>> shouldn't do anything noticeable now, I figure.
>>>
>>> If there's more recent info than that, it'd be interesting to hear.
>>>
>> I was concerned on the pi, but its there for /, but not for /boot.  And I
>> was never a fan of mutt, nor is email handled on that machine. It's
>> running 3/4 ton of metal lathe.  But I use what I describe as mounts to
>> put the high traffic dir as a mount over the top of an existing dir in
>> order to put, when its fully operational, that directory effectively
>> remoted to rotating media on this machine, useing sshfs.  This does of
>> course show up in /etc/mtab.  That in turn gives amanda a tummy ache
>> because although its wide open as far as perms go, its reported as no
>> permission despite there being an entry for that directory on the pi's
>> exclude list.  So amanda yowl's about it in the emailed backup report,
>> but it does get backed up with the rest of this machine so its no
>> biggie.
>>
>>> Erik
>> Thanks for the clarification, Erik.
>>> --
>>>  Announcing the Oxford Dictionaries API! The API offers
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>>
>> Cheers, Gene Heskett
>>
>
>
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Re: [Emc-users] Durable Paint [Was: gee, is list in anechoic chamber]

[Peter Blodow]

Thanks, Andy. Telling from the pictures there was a bit more to do than 
replacing some wooden pegs, I think. Our house is a little younger, only 
about 150 years, but when we bought it, it also was something like a 
well organized ruin. I know what refurbishing a house means.

Peter

Am 08.03.2017 12:55, schrieb andy pugh:
> On 8 March 2017 at 11:23, Peter Blodow <p.blo...@dreki.de> wrote:
>> what was subject of the re-roofing if the beams and "shingles" all
>> stayed the same? Thermal insulation?
> The roof had fallen off. The slates hang from wooden pegs through
> holes punched near the top. Those had largely failed.
> Full story here: http://www.bodgesoc.org/slaithwaite.html
> (a web page from the time of 28k8 modems when thumbnails really were
> thumbnail sized)
>


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Re: [Emc-users] Durable Paint [Was: gee, is list in anechoic chamber]

[Peter Blodow]

Andy,
what was subject of the re-roofing if the beams and "shingles" all 
stayed the same? Thermal insulation?
Peter

Am 07.03.2017 16:26, schrieb andy pugh:
> On 7 March 2017 at 14:05, Dave Cole  wrote:
>> I re-roofed the house a few years ago and decided against 50 year
>> shingles since I won't need anything that will last that long. ;-)
> When my dad and I re-roofed his house we decided to put back the
> "shingles" that had already been there 500 years.
> http://www.bodgesoc.org/Slaithwaite2/Front.JPG
>


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Re: [Emc-users] [OT] Wife is good to go

[Peter Blodow]

Wow, good to hear of a guy who is not as conceitet as are all others... 
I think much the same about myself.
Principally, you are right, it's a question of specialisation. But 
modern civilisation lives from the fact that NOT everybody can do 
everything, so handicrafts and commerce came into being. Wealth does not 
come from DIY.
Peter


Am 20.02.2017 11:26, schrieb andy pugh:
> On 20 February 2017 at 03:37, Dave Cole  wrote:
>> They aren't that hard to service.
>> However the Iphones are known to be difficult.   Still, the Iphone
>> repair guys are human as well.
> I work on the principle that anything that can be made by humans can
> be made by me, given enough time and money.
> Then I decide on whether I want to invest the time and money into the problem.
>
> iPhone battery replacement is not especially difficult, I have done it
> a couple of times.
>
> I have been hacking Apple kit for years. Back in 1995 I re-clocked my
> Mac LC475 by swapping some tiny SMT resistors on the motherboard, and
> I upgraded the graphics card on my G4 Cube. That involved moving some
> of the taller components on the PSU board to the opposite side of the
> board.
> You just have to be brave enough to try, much of the time.
>


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Re: [Emc-users] Koerner retrofit

[Peter Blodow]

Florian, Windows 95 / 98 is MS-DOS with a graphic user interface on top. 
There was a boot option to start with DOS and then start Windows 
manually afterwards from the command line, calling c:\windows\win.exe. 
It was possible to stop Windows, too, get out and return to the normal 
DOS surface. Very much like GEM on Commodore computers. When you asked 
for the system ID under Windows 95 it answered "DOS 7".

So, it should be possible to run a DOS program under Windows 95, maybe 
using some ingenuity.

Peter


Am 20.02.2017 10:11, schrieb Florian Rist:
> Hi Sven
>
>> That's a feature I really want in LCNC!
> / snip

And now that I think about it some more, I think 'my' Körner's
controller ran MS Windows 95, not MS DOS, so maybe you should check if
your controller software relay offers the nice feature before spending
time on MS DOS.

See you
Flo




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Re: [Emc-users] Koerner retrofit

[Peter Blodow]

Sven, the guy in the mail forum which I suggested to you expects the 
Körner company, especially its owner Michael Körner, to be so 
cooperative as to provide original documents from the archive. Why not 
try first before you throw it all away?

Peter

Am 18.02.2017 15:10, schrieb Sven Wesley:
> They are servos, pretty big for the machine size too.
> Thanks for the link! The machine is the same as the one they discuss
> (Körner 532S). The computer is still working so I will see if I can dig out
> any config from it. In worst case I'll rip the hardware out and buy some
> new drivers and a breakout board. Will probably be cheaper than spending
> hours of investigating the old electronics.
>
> /S
>
> 2017-02-18 13:23 GMT+01:00 Peter Blodow <p.blo...@dreki.de>:
>
>> Sven, please specify more detail of that machine, at least name, number
>> etc. There is a company (koerner.net), 36456 Barchfeld (bei Bad
>> Salzungen), Germany, making CNC machines. The motors are long, still may
>> be steppers, i use to have similar ones (Dunker Motors), somewhat smaller.
>>
>> Peter
>>
>> PS: look here:
>> https://de.industryarena.com/forum/fraesmaschine-wieder-
>> zum-leben-erwecken--8.html,
>> although it's in German.
>>
>>
>>
>>
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Re: [Emc-users] Koerner retrofit

[Peter Blodow]

Sven, please specify more detail of that machine, at least name, number 
etc. There is a company (koerner.net), 36456 Barchfeld (bei Bad 
Salzungen), Germany, making CNC machines. The motors are long, still may 
be steppers, i use to have similar ones (Dunker Motors), somewhat smaller.

Peter

PS: look here: 
https://de.industryarena.com/forum/fraesmaschine-wieder-zum-leben-erwecken--8.html,
 
although it's in German.



Am 18.02.2017 11:44, schrieb Sven Wesley:
> Hi all!
>
> Long time no see, been busy working. :)
> I bought a CNC engraver, really high quality but it has an old Dos(!) PC.
> Here comes a retrofit!
> The 60 000 RPM VFD is well documented, the drivers are not. The PC port
> looks like a parallel port but is labelled 'com 2'. I guess the drivers are
> step/dir. Anyone with a nice idea how to figure it out?
> I will try to see if the factory have any manuals left.
>
>
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Re: [Emc-users] Koerner retrofit

[Peter Blodow]

Gene, remember that the serial ports were used up to 115 KBaud in 
professional applications.
Perter

Am 18.02.2017 12:44, schrieb Gene Heskett:
> On Saturday 18 February 2017 05:44:03 Sven Wesley wrote:
>
>> Hi all!
>>
>> Long time no see, been busy working. :)
>> I bought a CNC engraver, really high quality but it has an old Dos(!)
>> PC. Here comes a retrofit!
>> The 60 000 RPM VFD is well documented, the drivers are not. The PC
>> port looks like a parallel port but is labelled 'com 2'. I guess the
>> drivers are step/dir. Anyone with a nice idea how to figure it out?
>> I will try to see if the factory have any manuals left.
> That might be your best bet. A closeup pix of one of the motors,
> including the label might help someone to recognized them. The one I can
> see most of in this pix sure looks a lot like a servo to me.  Too long
> for most steppers.  The driver box may be quite a complex construction
> in that event.  Com 2 may well be an rs232, the original specs did use a
> db-25 connector. You may have to put a scope on it to measure the bit
> time to determine the baud rate. Or if the pc still lives, it may be in
> the autoexec.bat.  Somewhere in this midden heap, I've a book on the
> older serial ports. No idea if it might be helpfull, but I'd be curious
> to see how they shoved all the data it takes to run 3 motors and a
> spindle thru what might be a 9600 baud serial port.  And I can't find it
> in this room, which means its in the basement, and it was mix-mastered
> by contractors from Basement Systems last spring as the dug a ditch for
> drainage and routed it to a sump for automatic pumping out.. And because
> they needed access to all the walls, everything is piled 6 feet deep in
> the middle. And no one knows which box contains what.
>
> Cheers, Gene Heskett


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Re: [Emc-users] vfd compatibility

[Peter Blodow]

Am 16.02.2017 08:40, schrieb Gene Heskett:
> On Thursday 16 February 2017 02:20:30 Valerio Bellizzomi wrote:
>
>> On Wed, 2017-02-15 at 19:13 -0500, Gene Heskett wrote:
>>> On Wednesday 15 February 2017 15:12:17 Valerio Bellizzomi wrote:
 On Wed, 2017-02-15 at 14:32 -0500, Gene Heskett wrote:
> On Wednesday 15 February 2017 14:13:17 Valerio Bellizzomi wrote:
>> On Wed, 2017-02-15 at 12:45 -0600, dragon wrote:
>>> The 20ma control circuit on the VFD is an analog control,
>>> where as the parallel port pin is a digital (on/off) signal.
>>> You will need some sort of hardware interface between the
>>> two to do a digital to analog conversion.
>> is there a list of supported hardware, that I could buy on
>> ebay ? I was looking at
>> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?LinuxCNC_Supported_Ha
>> rdwa re
>>
>> I have already 3 stepper drivers mounted in a metal box with
>> their power supply, I would need only a small interface for
>> the spindle.
> Using software stepping? I'd still use a pwmgen module in the
> computer to drive the vfd, but I'd put a SpinX1, from Mesa
> between them, for the noise isolation (vfd's are noisy
> electrically), and the control is quite linear. I would put the
> pwmgen in the PDMgen mode, see the man page as that removes the
> need to dither the pulse width because each step is fixed, the
> dither keeps it at the requested speed. But with PDM, you don't
> need the dither.  With SW pwmgens, I'd choose a refresh rate
> below the servothread by about half, the vfd shouldn't mind.
 I have checked out the mesa store, it is a problem for me that
 they do not have paypal transactions among their choices for
 payment, I do not own a credit card

 is there another way to purchase say a spinx1 or equivalent board
 ?
>>> There are actually 2 web stores, one by Peter C. Wallace, out on the
>>> left coast, and Big John Thortons's site in southern Missouri. I am
>>> pretty sure either would take a check or money order. Big John ships
>>> the same day if he has it, 3 days to West Virginia is the worst he's
>>> done to me. I would imagine your money order would not be much
>>> slower.  Another day perhaps.
>>>
>>> Cheers, Gene Heskett
>> Thanks Gene, I have already ordered one spinx1 here
>>
>>
>> http://mesaus.com/index.php?route=product/product_id=91
>>
>> I guess it will take a month or so as I live in Italy
>>
> Thats a bummer. Maurius L., or Andy, is there not someone on your side of
> the pond that could get it there faster for when the next time comes up?
>
> Cheers, Gene Heskett
There used to be an internet shop in southern Germany, I forgot the 
address. That's EU, so shipping would last a few days at maximum. PCW 
should know, for he provided it to me some years ago.

Peter

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Re: [Emc-users] Tida_TD-1336_lathe

[Peter Blodow]

Kirk,
on my Graziano SAG 12 there is a similar spindle head with the camlock 
fastening system. I made a lot of additional bolts for different chucks 
and faceplates so I had all the parts in my hands quite frequently.
  The locking inserts (nuts or what you call them) in the spindle head 
are excentric in the middle and symmetrical so you can fasten the 
camlock either way, left or right. We are used to tighten clockwise, so 
I prefer this. The bolts are screwed loosely into the plate into 
randomly cut threads and only prevented from turning by an additional 
1/4" bolt, so it depends on chance just exactly how far they protrude 
when screwed in. (To show the desired position, they have a ring groove 
which is supposed to be about even with the faceplate's surface.) The 
excentricity of the nuts and the camlock bolts with their (weird) low 
pitch threads are designed as to tolerate this. Of course, there may by 
no means a gap between the spindle head and the plate. And when 
tightening, the wrench must come to a final position where no more 
movement is possible.

Peter


Am 01.02.2017 17:13, schrieb Kirk Wallace:
> On 01/31/2017 03:37 PM, Kirk Wallace wrote:
>> A lathe showed up on my doorstep (almost). A friend called up and said
>> "I've got a lathe in my trailer and I want to know if I can bring it by
>> today." I guess he knows me well enough to know that I could not refuse.
>> I have had it a couple of days and I took some time to scrape the first
>> layer of grime off of it and take some pictures.
>> http://wallacecompany.com/machine_shop/Tida_Samson_TD-1336_lathe/
> ... snip
>
> Another thing I'm curious about. I haven't used a D1-4 Camlock before
> and I can't seem to find information on how to use it. I did find the
> specifications:
> http://www.tools-n-gizmos.com/specs/Lathe_Spindle_Mount.html
>
> but mine is a little different than the one shown in the link above. The
> linked spindle shows the cam is just clockwise of the chuck pin puller
> hole. Mine is counter clockwise which suggests that the locking motion
> is different.
>> http://wallacecompany.com/machine_shop/Tida_Samson_TD-1336_lathe/IMG_1774-1a.JPG
> Looking closer, the example chuck plate is like mine. The spindle
> picture suggests righty-tighty (clock-wise-tighty), the chuck example
> and my lathe suggest counter-clock-wise-tighty. Do D1-4 mounts go both
> ways? Also, I found information that the pull pins need to be adjusted
> so that the cams will detent when tight. Any help clearing this up would
> be appreciated.
>
>


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Re: [Emc-users] iffy question about chuck mounting.

[Peter Blodow]

Never touch a running system.
Peter

Am 21.01.2017 20:24, schrieb Gene Heskett:
> Greetings everybody.
>
> My 3 jaw chuck atm, runs pretty true. But to be able to turn the
> faceplate around and clean up the OD of the hub for a grab surface for
> my clamp concoction so it can't unscrew itself during a violent
> reversal, I'll have to remove the chuck, removing its 5.16" socket cap
> screws.
>
> Whats my chances of getting it remounted so it runs true again once I
> have made a 2 or 3 thou cleanup cut on the rear hubs OD with the the
> faceplate reversed on the spindle?
>
> Cheers, Gene Heskett


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Re: [Emc-users] Machinekit? --> LinuxCNC computer

[Peter Blodow]

Gene,
when I started listening to this list, I was intrigued by the 
possibilties of using ordinary "left-over" desk top PCs (which were 
getting very cheap at the time) to do extraordinary work with ordinary 
out-of-time machinery. This wonderful idea met my desires to make ends 
meet and, what's more, at low cost. Now, LinuxCNC has gone commercial, 
and using "dedicated", purpose-made computers doesn't appeal much to me 
- everybody makes dedicated computers and builds modern gadgets with 
them. It has lost lots of charms by now.

By the way: at least in this country, polo shirts don't have pockets, 
that's why I dont like them.
Best wishes
Peter


Am 23.10.2016 14:46, schrieb Gene Heskett:
> I am intrigued by the processing power I can put in a polo shirt 
> pocket, but is it useable power for our purposes?


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Re: [Emc-users] Wat OT: Question about injection molding of PVC

[Peter Blodow]

PVC flooring is roilled out in long strips and then joint welded by 
little automatic machines, running along, following the joint by a 
sensor stick and equipped with a hot air fan and a roll of 4 mm PVC 
wire. Every floor working shop has been using them for a long time. PVC 
welding is easy. No CNC involved. Automation can be so simple.

Peter Blodow



Am 16.10.2016 03:44, schrieb Leonardo Marsaglia:
> 2016-10-15 22:33 GMT-03:00 John Kasunich <jmkasun...@fastmail.fm>:
>
>> Injection pressure will be trying to force the two sides of your mold
>> apart.
>> That's why injection molds are made of tool steel, and injection machines
>> have VERY sturdy construction to hold the mold closed.  I saw a machine
>> that might be big enough to make your parts - the mold closing cylinder was
>> about 2 feet (0.6m) in diameter, and the four steel tie-rods that held the
>> machine together against the clamp force were about 100mm diameter.
>>
>> Could you make it out of four strips with some kind of joining at the
>> corners?
>>
> Hello John.
>
> Yes the idea is to machine the four strips and then joing them strongly. To
> clamp the mold I was thinking about mechanical ways like eccentrics or may
> be screw clamps. That way I can hold the mold together when the injection
> takes place. I really don't worry about the time consumption on open the
> mold and close it again.
>
> The concerning part I have is if It's a good idea to move the pistons for
> the injection with a screw and a common 3 phase AC motor. My idea is to
> load the piston, wait for the plastic to reach the temperature and then
> inject no less than 30 seconds. I probably have to preheat the mold too.
>
>


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Re: [Emc-users] Problem upgrading from 2.7.4

[Peter Blodow]

Am 12.10.2016 22:00, schrieb andy pugh:
> On 12 October 2016 at 20:44, Russell Brown  wrote:
>> What version of python do you have on that?
> I would go and look, but it's raining and that machine isn't set up
> for wake-on-lan.
>
At least you have a sound reason for not going.
Peter

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Re: [Emc-users] pressure equalizer method around ball nut

[Peter Blodow]

If you ever tried to spot-weld two alu sheets, the welder developing 
about 1 volt, it will show you that it is a question of voltage to break 
through the oxide layer. After tat, you have conductivity. In order to 
spot weld, scratch the surfaces hard with a rotating steel brush, after 
that you have about 1 sec. for the welding.
Alu surfaces oxidise and thus the area in the vicinity of the contact 
gets smaller. This gives a rising current density at the contact spot. 
Current through a resistance gives cause to heating until the hole 
contact area burns up or melts down, if there is enough power delivered 
by the wires.

Peter

Am 07.10.2016 22:05, schrieb andy pugh:
> On 7 October 2016 at 20:55, Przemek Klosowski
>  wrote:
>> If the alumina layer is thickened (e.g. by anodization), the aluminum
>> objects will be isolated;
> I will also note the apparent conductivity of my anodized
> solder-sucker. But that is probably a think anodised layer, not one
> intended for isolation.
>


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Re: [Emc-users] Rotary table indexer project

[Peter Blodow]

Sorry, Chris, your first link doesn't work (not found) and the second 
requires registration with dropbox or google. Not for me.
Peter


Am 26.09.2016 05:45, schrieb Chris Albertson:
> I've started work on a motorized indexer for my rotary table.   At this
> point I am not calling this a fourth axis.  The way this will be used is to
> (1) rotate the table, (2) clamp it down, (3) perform the drill or mill
> operation (4) unlock) then if not finished go to #1.
>
> A fourth axis would required more mechanical precision.  I plan to drive
> the table only on one direction and clamp down the clamps when cutting.
> It should work well for making bolt circles and the like.
>
> Later I can see if my low-cost table can be used for more.
>
> The project adds a stepper motor to replace the crank because I am not good
> at counting or finding holes on an index plate.   The motor connects via
> direct drive to a a worm that drives a 72 tooth wheel.  I can micro step at
> about 8:1.  This gives me about 0.0001" of resolution at the edge of the
> table and a lot more near the enter.
>
> For your amusement here is a photo of the controller electronics, computer
> and all working on my electronics bench.   The user interface is a rotrary
> knob that you can "push to select" and there is a small LCD for a display.
> https://www.dropbox.com/...ElectBenchTest01.jpg
> 
>
> The little 8-bit computer can drive the stepper at almost 10,000 steps per
> second.  The steps have 105 uSec period with only a few tens of nanoseconds
> variation.  I'm currently using a 12 volt plug-in power cube to power the
> stepper.
>
> QUESTION:  Before I get further along, within the limits of this hardware
> what features would be good to include?   The memory has tons more room for
> software and many unused pins on the Arduino.  I wonder if I missed any
> useful features?
>
> 1) selectable units, either degrees/minutes/seconds or fraction of a circle
> 2) A physical button to set the zero point
> 3) A physical "step" button to move to the next point
> 4) can set the step size with rotary dial
> 5) controls lock out automatically when it does not make sense to use them
> to avoid accidental activation
> 6) A fine motion mode where the table moves 1 second of arc per click of
> the rotary dial, for fine tuning the zero point
> 7) the display will show the current position and the step size in
> selectable units
>
>
> Is there anything I missed?
>
> PS.   This is only tangentially related to LinuxCNC, connection to that
> comes later.   Another project I want to do is to add a replica of the
> physical hand wheels that go on a manual machine tool.  It would be self
> contained not using a PC.  Likely just three wheels with one of those small
> LCDs above each one to serve as a digital readout.   Basically what you see
> in that photo times three.
>


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Re: [Emc-users] Silly Q about glues

[Peter Blodow]

Reallly handy, this chart. Too bad none of these products have ever been 
seen on this side of the world.
Peter

Am 30.08.2016 22:15, schrieb Ken Strauss:
> Is that what you meant?
> http://makezine.com/2016/03/25/dont-glue-anything-without-handy-reference-ch
> art/
>
>
>> -Original Message-
>> From: R.L. Wurdack [mailto:di...@nwlink.com]
>> Sent: Tuesday, August 30, 2016 2:05 PM
>> To: Enhanced Machine Controller (EMC)
>> Subject: Re: [Emc-users] Silly Q about glues
>>
>> Sorry, Gene. My mags are down at the ranch and I'm picking apples up here
> at
>> the farm. I'll look up the reference as soon as I have a chance.
>>
>> Richard.
>>
>>


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Re: [Emc-users] OT: Servo drive tripping out

[Peter Blodow]

Thanks, Andy, guess where I have (part of) my wisdom from ... (from the 
german wiki, though).
The point I wanted to make: a connector with tinned prongs costs 5 
cents, with gold plated ones 6 cents. Very little difference, measured 
on the cost of a refrigerator. Same with machine control systems: never 
take compromises on the quality of electronic elements, it doesn't pay.

I found out now that, for instance, a few years ago, Siemens went back 
from electronic to mechanical thermostats (with a capillary pipe) in 
their refrigerators. Why?

Peter

Am 04.08.2016 03:02, schrieb andy pugh:
> On 3 August 2016 at 23:14, Peter Blodow <p.blo...@dreki.de> wrote:
>> Beginning at 13.2 degrees C. going down, it
>> starts changing its metallic character to a more crystalline form,
>
> https://en.wikipedia.org/wiki/Tin_pest
>


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Re: [Emc-users] OT: Servo drive tripping out

[Peter Blodow]

Tin is a very tricky element. It's neighbour in the Periodic Table is 
germanium, a semiconductor. Beginning at 13.2 degrees C. going down, it 
starts changing its metallic character to a more crystalline form, 
almost like powder. At -48 degrees C. it may turn to powder within an 
hour. All depending on purity and alloy status. Napoleon's army 
experienced this on the way back from Russia to France in the icy winter 
of 1812 when the tin buttons of their uniform trousers and jackets 
deteriorated to dust.

I myself experienced this when my refrigerator freezed all its contents 
to solid ice a few weeks ago. I swapped the central electronics PC 
board, but made no points. After some more experimenting, I discovered 
that the NTC sensor cable, where it was connected to the board, had 
tinned prongs on the miniature plug. Obviously, after ten years of 
service at below 10 degrees C.,  the tin coating on the prongs decided 
to develop some resistance, adding to the NTC resistance value and 
causing the microprocessor to run the cooler down as far as possible.

I found out by asking lots of people that the manufacturer later had 
changed the arrangement by soldering the sensor cable to the 
microprocessor board directly.


Peter




Am 03.08.2016 17:32, schrieb jrmitchellj .:
> If you follow Gene's suggestion, while you are in the unit, check the
> circuit boards for cracked/stressed solder joints.  Over the years, heat
> cycling will cause joints to crack, especially in areas that generate heat,
> like around resistors & transistors.  Capacitors can also heat up causing
> cracks.  As they age, their ESR can rise, causing more heat buildup.
>
> I have repaired countless items by nothing more than reflowing solder
> joints!
>
> If you are allowing your equipment cabinet to rise to 95 before cooling
> starts, the localized rise will be much higher.
>
> Ray
>
> --J. Ray Mitchell Jr.
> jrmitche...@gmail.com
> (818)324-7573
>
>


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Re: [Emc-users] brass and warpage during machining.

[Peter Blodow]

Heat treating means applying heat to whatever material on earth. 
Hardening is one aspect of it, annealing another, softening or making 
malleable yet another. It is not to be expected hat all materials behave 
the same.
Everyone knows that brass and other copper alloys harden by mechanical 
stress and soften by heating. Just try to straighten a copper wire by 
bending. Ferrous metals act different because of their crystal 
structure, changing from martensic to austenic (that right in English?) 
and back, which copper alloys don't have.

Peter

Am 02.08.2016 20:00, schrieb Mark:
> On 08/02/2016 01:40 PM, Stephen Dubovsky wrote:
>> On Tue, Aug 2, 2016 at 10:46 AM, Mark  wrote:
>>
>>> You can't "heat treat" brass/bronze/copper etc (non-ferrous) to harden.
>>> You can only anneal those metals.  They do, however, work harden, which
>>> annealing takes away.
>>>
>>> Mark
>>>
>> FWIW, There are copper alloys that can be heat treated.  Beryllium copper
>> is one example.
> That is kind of atypical though for most non-ferrous metals and alloys.
> I always treated heat treating and annealing as two separate processes,
> the former typically hardening the metal, and the latter making it
> softer.  That's how I learned it way back when, but perhaps the
> definition should be expanded.
>
> Mark
>
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Re: [Emc-users] OT Seating Tire Bead

[Peter Blodow]

Please, could someone explain to a ignorant old-worlder, what a 
clamshell digger is?
Peter

Am 28.07.2016 05:30, schrieb Todd Zuercher:
>
> - Original Message -
> From: "Gene Heskett" 
> To: emc-users@lists.sourceforge.net
> Sent: Wednesday, July 27, 2016 8:41:09 PM
> Subject: Re: [Emc-users] Nother Q about these Chinese inverters
>
> On Wednesday 27 July 2016 11:26:55 Gene Heskett wrote:
>
> I got everything hauled to the scene except my clamshell digger.  Plumb wore 
> the old man out. The rider had a flat tire that did NOT want to re-seat and 
> hold air.  Needs new rear tires, guessing 25 yo & badly weatherchecked.  And 
> them'er $50/copy.  Sigh.  OTOH, I am still looking down at the grass. :)
>
> Cheers, Gene Heskett


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Re: [Emc-users] Anyone heard of EBZ Engineering from the mid 90's?

[Peter Blodow]

Gregg,
to say it clearly once again: The Sub-D (DB-xx) connector on the side of 
your machine has surely nothing to do with PC technology, whatsoever. It 
is just an (still) easily available, low power plugging system that can 
be used for any purpose requiring multiple pins.

Especially, your connector has nothing to do with game ports, analog 
inputs, network connections or anything of that sort. I myself adopted 
Sub-D 9 long ago as my standard encoder connection system. And I am 
using Sub-D 25 in my model ship as a RC-signal bus. Anybody is free to 
make his own standards with it. Keep away any cable from that connector 
until you know what the pins are connected to!

If I had to construct a machine like yours, I would fit a power supply 
in the back of it together with a circuit board containing a indexer IC 
and a H-bridge amplifier for the steppers. Their signals, step and 
direction each, together with the limit switches (probably behind those 
bellows) would be connected to the Sub-D connector on the side. To avoid 
trouble with cables, I would chose a Sub-D 15 pin connector because they 
are not so commonly used, compared with 9 pins. That's it. The rest 
happens in software. 100% sure that the motors are pure steppers, no 
encoders needed there. As a matter of fact, I have built such mini-mills 
for circuit board drilling and fitted a precision miniature mill and my 
large milling machine for gear wheel making that way.

So, you will find 4 or 6 step-and-direction pins, several sensor switch 
pins (depending on the number of axes controlled and the way they are 
hooked up), postive voltage supply (red) and ground (black or brown) 
connected to that connector. These would all be identifiable once you 
opened that darned case and mailed some pictures. Unscrew the circuit 
board, fold it out and take pictures from the othe side. Look for 297 
and 298 type IC's on the boards, they were used frequently as indexer 
and bridge. I am very sure you won't find microcontrollers in there, 
nothing to do for them is a simple application as this.

Greetings

Peter

Am 15.07.2016 09:39, schrieb Gregg Eshelman:
> DA-15. DB is the size of a PC parallel port. 9 pin serial ports and Atari 
> 2600 or old SEGA game ports are DE. The letter references the size of 
> D-Subminiature connectors. Apple's 19 pin floppy connector is a bastard size, 
> used in very few applications - something on NeXT and Atari in addition to 
> Mac and later apple ][ external floppies, so it has no official letter 
> designation. (But people still call it DB-19.)
>
> Well, they haven't been made since sometime in the 1990's and the supply had 
> completely dried up. Big Mess O Wires makes a floppy emulator for old Mac and 
> apple ][ computers and needed those connectors but couldn't get any. 
> Eventually he roped in NeXT and Atari enthusiasts and an electronics supplier 
> wanting some - raised enough money for the 10,000 piece minimum order.
> I wonder what it felt like to have the entire worldwide supply of a new thing 
> sitting on his patio? DB-19: Resurrecting an Obsolete Connector | Big Mess o' 
> Wires
>
>
> |
> |
> |
> |   ||
>
> |
>
>|
> |
> |   |
> DB-19: Resurrecting an Obsolete Connector | Big Mess o' Wires
> |   |
>
>|
>
>|
>
>   
>
>   
>From: Ralph Stirling 
>   To: Enhanced Machine Controller (EMC) 
>   Sent: Thursday, July 14, 2016 10:14 PM
>   Subject: Re: [Emc-users] Anyone heard of EBZ Engineering from the mid 90's?
> 
> DB15 connectors are used lots of places besides ancient pc game ports.  
> Highly unlikely this machine has any connection to the game port.
>
> If you can determine the type of motors (stepper, dc brush, or unlikely 
> brushless dc), you can then either ditch all the electronics or start 
> figuring out what the chips on the pcb are doing.  If there is a big 
> microprocessor (40 pins or more), forget using the electronics with lcnc.
>
> -- Ralph
>
> 
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Re: [Emc-users] Anyone heard of EBZ Engineering from the mid 90's?

[Peter Blodow]

Gregg,
another thought: Your litle machine seems to be manufactured in a very 
professional manner, probably rather expensive since they had it made in 
Switzerland (double prices compared with Germany, but very high 
quality), for internal use in the key lock manufacturer's company. So, 
once this machine was essential for their production. No consumer junk. 
So I think, the electronics will also not be home-brew from some garage 
electrician, but will consist of professional stepper boards and other 
hi-rel components, too, which will be identifiable. And they most 
certainly didn't invent a special computer for running it, but used a 
standard IBM-AT type PC. Probably it's only a question of a special 
adapter cable, maybe even to a standard PC printer port. This is almost 
all you need for using LinuxCNC.

I assume the machine is electrically ok and gives some signs of it when 
switched on. So, open the electronics box on the rear and let me have a 
look at the interior. I suppose there will be one to three boards for 
the steppers and some more electronics for the spindle motor. If these 
are professional items, too, there will be a manufacturer's label in the 
boards, type number etc. Mail me some pictures, will you? It should be 
possible to find out how the steppers are wired. Too bad I can't have a 
look myself, because figuring out how these thing runs would be not so 
far out. Maybe I can find the driver board's manufacturer, wouldn't 
doubt it. They are usually more cooperative.

Greetings
Peter




Am 14.07.2016 02:46, schrieb Gregg Eshelman:
> Looking at a small 3-axis CNC unit from 1995. All gold/orange anodized 
> aluminum bridge style frame with the spindle moving in X and Z on it while 
> the table on the bed moves in Y.
> The label says it's a Kaba-Keycut, date is from 1995. Has a funky lever 
> action vise with special jaws and a V pointed bit in an ER-16 collet, though 
> with a very slim nut that would take a special wrench instead of the common 
> hex nut.
>
> I find nothing whatsoever about key cutting or CNC equipment with the current 
> company named EBZ Engineering, though it is still in Germany. (The motors 
> have German names etc on them.)
>
> Now for the kicker. The only interface connection on it is a DA-15 female 
> plug, same as on old PC gameports and Mac monitor ports. I opened up the 
> electronics box and there's zip, zero, nada, no marking of any sort on the 
> PCB.
> My assumption is that port has RS232 communication plus some sort of feedback 
> lines. There's a tiny button on one of the clamps holding the vise, with a 
> wire going off to somewhere, and there's probe mounted under the head to the 
> rear of the spindle. Assumption, those are for Z-zero setting.
> Alternatively, all the required step, direction, enable etc signals for a 3 
> axis stepper motor mill can fit onto only 14 pins. There's no separate 
> spindle power switch or speed knob on it so that also must be controlled via 
> the 15 pin connector.
> How might I go about figuring out the pinout on this? If that can't be done 
> and no 1995 vintage manual can be turned up, then the only option would be to 
> toss the existing electronics and fill the box with new. Without the 
> specialized vise, or with different jaws, it could be useful for milling 
> small and intricate things. Looks to have working volume around 2x2x2".
> --
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> patterns at an interface-level. Reveals which users, apps, and protocols are
> consuming the most bandwidth. Provides multi-vendor support for NetFlow,
> J-Flow, sFlow and other flows. Make informed decisions using capacity planning
> reports.http://sdm.link/zohodev2dev
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Re: [Emc-users] Anyone heard of EBZ Engineering from the mid 90's?

[Peter Blodow]

Gregg,
the EBZ group  is a fairly large german tool company, situated in 
southern germany, with factories in Hungary, India, China and the US. 
900 employees, 250 MEUR per year. They make very special machinery for 
car body building, i.e. robots. They have a US branch:

EBZ SysTec Inc.

22251 Diesel Drive
McCalla, AL 35111
USA

PO Box 160

Tel  +1 (0)205 203-9986
Fax +1 (0)205 533-7031

E-Mail info(at)ebzusa.com 

Internet www.ebz-group.com 

especially: http://www.ebz-group.com/de/main/ebz-gruppe.html

There are no publications about their individual products, probably 
because they are working mostly on secret customer specific projects. 
But I doubt that simple parts like your motors are made by one of their 
factories, those are parts that companies like them buy on the market 
and stick their label on them.

Try your luck.

Peter



Am 14.07.2016 02:46, schrieb Gregg Eshelman:
> Looking at a small 3-axis CNC unit from 1995. All gold/orange anodized 
> aluminum bridge style frame with the spindle moving in X and Z on it while 
> the table on the bed moves in Y.
> The label says it's a Kaba-Keycut, date is from 1995. Has a funky lever 
> action vise with special jaws and a V pointed bit in an ER-16 collet, though 
> with a very slim nut that would take a special wrench instead of the common 
> hex nut.
>
> I find nothing whatsoever about key cutting or CNC equipment with the current 
> company named EBZ Engineering, though it is still in Germany. (The motors 
> have German names etc on them.)
>
> Now for the kicker. The only interface connection on it is a DA-15 female 
> plug, same as on old PC gameports and Mac monitor ports. I opened up the 
> electronics box and there's zip, zero, nada, no marking of any sort on the 
> PCB.
> My assumption is that port has RS232 communication plus some sort of feedback 
> lines. There's a tiny button on one of the clamps holding the vise, with a 
> wire going off to somewhere, and there's probe mounted under the head to the 
> rear of the spindle. Assumption, those are for Z-zero setting.
> Alternatively, all the required step, direction, enable etc signals for a 3 
> axis stepper motor mill can fit onto only 14 pins. There's no separate 
> spindle power switch or speed knob on it so that also must be controlled via 
> the 15 pin connector.
> How might I go about figuring out the pinout on this? If that can't be done 
> and no 1995 vintage manual can be turned up, then the only option would be to 
> toss the existing electronics and fill the box with new. Without the 
> specialized vise, or with different jaws, it could be useful for milling 
> small and intricate things. Looks to have working volume around 2x2x2".
> --
> What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
> patterns at an interface-level. Reveals which users, apps, and protocols are
> consuming the most bandwidth. Provides multi-vendor support for NetFlow,
> J-Flow, sFlow and other flows. Make informed decisions using capacity planning
> reports.http://sdm.link/zohodev2dev
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>



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Re: [Emc-users] ER-16 spindles

[Peter Blodow]

Being in possession of a lathe, I bought a set of cheap collets, a 
special nut and a six-prong wrench to go with them and made my spindle 
myself.
Peter

Am 29.06.2016 17:16, schrieb Ralph Stirling:
> Have any of you come across cheap collet spindles that
> have a through-bore?  I am toying with an idea for a
> simple, special-purpose lathe, and need a hollow spindle.
>
> Thanks,
> -- Ralph
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Re: [Emc-users] slow time, or server upchuck (again)

[Peter Blodow]

Gene, haven't heard a lot from you recently, either - thought you were 
rinsed away by a little water, as I read in the news?
Peter

Am 26.06.2016 15:22, schrieb Gene Heskett:
> Greetings all;
>
> Its been 10 days since I last rx'd a message from this list.  Is
> everybody on vacation?
>
> Cheers, Gene Heskett


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Re: [Emc-users] Quiet?

[Peter Blodow]

Oh John,
for us over here "on the other side of the pond" it is exceedingly 
interesting what is being said about Donald in his own country. We all 
wonder who these Americans actually are that encourage him on his hate 
campaign and may even elect him... Keep writing!
Peter


Am 08.06.2016 18:53, schrieb John Kasunich:
>
> On Wed, Jun 8, 2016, at 12:11 PM, Gene Heskett wrote:
>
>> Maybe, maybe not. Shrillaries victory speech last night came straight out
>> of Bernies socialist bible, and that scares the crap out of me, lots
>> more than the Donalds blowhard bluster.
> Guys, please.  We have a fair amount of off-topic stuff on this list,
> and for the most part that's OK.  But PLEASE, let's leave the
> politics out of it.
>
> Trump fans aren't going to convert Clinton fans, Clinton fans
> aren't going to convert Trump fans.  But everyone will have
> to hear the discussions and the arguments and the name-
> calling.  We're going to have enough (far too much) of that
> elsewhere for the next several months, lets not have it here.
>
> I'm not trying to single Gene out here.  Once these things start
> they inevitably go downhill, and this one started several messages
> ago.
>
> Let's just not start.
>
>


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Re: [Emc-users] USB flash drive issue

[Peter Blodow]

How about unmounting the stick first before ejecting?
Peter

Am 12.05.2016 16:50, schrieb Jim Craig:
> All,
>
> I found an issue that I think is a bug but would like feedback before I
> post it on the GitHub issue list.
>
> I was using a USB flash drive to transfer files from my CAD/CAM pc to
> the LinuxCNC box. To do this I would plug the flash drive into the Linux
> box and would mount the volume. The files are then available at /media/usb/
>
> If I accessed a file from LinuxCNC in the Axis GUI at the location of
> /media/usb/ the file would open fine and would run perfectly.
>
> The issue is when I wanted to eject the volume so I could take it back
> to the CAD/CAM box. To do this I would open a file that is on the local
> hard drive in LinuxCNC so that it should release the /media/usb/
> resource. I would then attempt to eject the volume and it would throw up
> an error message stating that it was still busy.
>
> The only way I could eject the media was to completely close the
> LinuxCNC application so it would release the /media/usb/resource so it
> could be ejected.
>
> I am running Debian Wheezy with 2.7.4.
>
> Let me know if this is a bug or if there is something else that I should
> be doing. I know I could copy the file to the local drive and not open
> it from the USB flash drive.
>
> Thanks,
>
> Jim
>
>
>
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Re: [Emc-users] Cutting cast iron with a dry diamond blade

[Peter Blodow]

Gene,
cast iron is easy to cut, mill and turn because it contains lots of 
carbon, better known as graphite which is a natural solid lubricant. 
Using water in addition, if any, is merely for cooling and carrying away 
the debris. However, if the casting has been cooled very rapidly, it may 
be surface hardened (this is used for industrial purposes, too). You 
won't get a scratch on such "hard cast iron" with ordinary tools. So it 
may be that diamond cutting is useful for getting through the surface, 
the rest could be cut with any old steel tool.

I would have used one of my angle grinders with a grinding disc for 
steel and cut down that cast iron piece in a matter of minutes. It all 
depends on the right bonding material of the grains.

By the way; tell an old non-American, what is the idea of this lawyer 
biz you mentioned?

Peter

Am 10.05.2016 23:57, schrieb Gene Heskett:
> On Tuesday 10 May 2016 15:41:57 andy pugh wrote:
>
>> On 10 May 2016 at 14:28, Roland Jollivet 
> wrote:
>>> I once watched a contractor dry cut rebar with a diamond blade using
>>> a cut-off saw. I wanted to tell him you can't do that,
>> http://www.husqvarna.com/us/construction/products/diamond-blades-for-p
>> ower-cutters/di5-ductile-iron-blade/
> If I can put yet another oar in this water, it seems to me that Husqvarna
> et all, is far more interested in selling you another blade at quite a
> nice profit margin than in doing a job correctly.
>
> Diamond, spinning at those speeds, will shatter from impact, and if not
> adequately cooled, will get hot enough to ablate/evaporate the diamond,
> both of which will result in the premature destruction of the blades
> ability to cut anything.
>
> Unfortunately, when you are paying the person who needs to cut such by
> the hour, it quickly becomes expedient to buy the fresh blade to replace
> the one destroyed by the pressure to "get the job done".  It becomes a
> C.O.D.B.
>
> By running it wet, you can somewhat alleviate the heat that evaporates
> the diamond.  But note the "somewhat" because the heating is localized,
> confined to the actual contact of that grain of diamond with the
> material being cut, and at the rim speeds of a modern power saw, there
> is 100x more air at the contact interface than water as its carried into
> the slot being cut by the rapidity of the rim, which itself is busily
> throwing that water away from the blade and generally makeing a huge
> mess of the environment up to 15 or 20 feet away.
>
> At nominally 400 revs on a 10" wheel, the impact shock that shatters the
> diamond is reduced by 10x, reducing the cutting degradation rate by an
> estimated 10,000%.  And if not pushing the blade, but just letting the
> diamond carry away the cutting dust its making, the heating will also be
> reduced.  In making those two cuts thru a solid casting about 4.25" in
> diameter, I watched the rim temp with an IR thermometer, and never saw
> it exceed 120F at about 3/8" in from the blades edge.  It appeared the
> actual edge of the blade was running 15F cooler.
>
> Yes, it took a long time to do those 2 cuts.  Had I been physically able
> to attend to the mill full time, about a day a cut.  But that blade can
> do that, at that cut rate, probably another 100 times.
>
> Running that slow and easy, wet or dry has relatively little effect on
> blade longevity because there is not enough heat, or a high enough
> impact shock to damage the diamond.
>
> All of this seduction of the canine could have been alleviated had I been
> able to back the clock up to about 1948 when an uncle of mine landed a
> contract to cut the mounting bosses off an eyeglass lens makers cast
> iron forms so his forms would be usable in a newer machine.  My uncle
> built the first abrasive cutup saw I ever saw, and he didn't have any
> lawyers telling him what he could not do.  In '48, the abrasive wheels
> came in 10 or 11", you wrapped them on a shield of steel about 1/4"
> thick to catch the shrapnel as the recommended rpms for those wheels was
> pretty close to 9500.  So he first used a pulley ratio that gave about
> 7500, but it wasn't fast enough to easily start the fire.  So he went to
> town and got the next smaller pulley, which gave it almost exactly 10
> grand.
>
> Bringing the wheel to the casting, it only took 3 or 4 seconds to start
> the fire, and it literally fell thru the 1.25" square block of cast they
> were cutting off in another 2 or 3 seconds.  He blew up one wheel in
> cutting about 200 of them off that way.
>
> But can I buy an abrasive saw that will cut like that today?  Not no, but
> hell no, at least not without putting 5 grand or more into it.  The best
> OTC saw turns a 14" wheel about 4 grand, and it cannot get the fire
> started in a 1/2x2" bar of cold roll without 3 or 4 minutes of leaning
> heavily on the blade just to get the fire started.  The damned lawyers
> and bean counters have caused the wheel speed to be reduced (14" wheels
> are 

Re: [Emc-users] 7mmx1.0 decently hard cap screw, how scarce are they?

[Peter Blodow]

I made some M35 taps by hand years ago when I built my observatory, it 
took two persons, though.
Peter

Am 09.05.2016 22:23, schrieb Adam McLeod:
> If you are lacking torque, another option is to only run the tap in to
> your first peck, then hand tap the rest.  There should be enough there
> to get the tap started nice and square, and M8 taps aren't too difficult
> to drive by hand with a decent wrench.
>
> Adam
>


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Re: [Emc-users] 7mmx1.0 decently hard cap screw, how scarce are they?

[Peter Blodow]

Gene,

  M7 screws are as rare as white raven since this thread is only printed 
in fine italics the DIN book. The only place I know of them being used 
is for fastening the cooler fan of some Renault vehicles, but merely in 
left handed version. No kidden. The French are supposed to use M7 more 
frequently, like in constructing basement storage shelves, but, as the 
saying goes, cooks in hell are english and mechanics in hell are 
french... There is not much good with M7 anyway since the threads are 
the same pitch as M6, so their holding force will be about equal to M6, 
just making bolts heavier. Wonder how in the world you got to own M7 
cutting tools, I know nobody who ever even saw one? (I myself have a 
left handed one, by buying a wholesale box from the flea market). 
Moreover: If you managed to strip the M6 threads out, you won't gain 
much by replacing them with M7 since thread depth is just the same.

Use M8 and you're out of trouble, 25% more depth (if there is sufficient 
spindle diameter). By the way: why don't you just cut those spindle 
threads by hand, anyway, why bothering your itsi bitsi machine and PSU 
with it, or did I miss something? On the other hand, owning a lathe, why 
don't you make your own bolts to any size you want? I often have to make 
strange, e.g. imperial threads and others, like camera adapters (using 
pure unobtainium, as you say). It's easy.

Greetings
Peter


Am 08.05.2016 05:49, schrieb Gene Heskett:
> Greetings all;
>
> Trying to hold a 10" diamond saw blade yesterday, tight enough to keep it
> from slipping, I striped out the 6mm threads in my arbor.
>
> So today I bored it gently out to around .230" or 15/64's and re-tapped
> that to 7mm x1.0.  It wasn't until I was cleaning that up that I
> realized I had not seen any 7mm x1.0 screws on my side of the planet.
> So I assume that I may as well redo it for an 8mm screw tomorrow.
>
> But that will be loads of fun because with the 7mm tap in the chuck, I
> had to keep asking for a smaller peck per stroke because even in low
> gear, and the current limit in Jon's servo amp set to limit at about 15
> amps, 150% drive for that motors nameplate, I was raising the divider
> that determined the additional stroke per peck until it was taking at
> least 7 or 8 pecks to tap one additional mm deeper.  Combine that with
> the tap I was using have a longer that normal nose taper, I hit the
> bottom of the hole and that locked the spindle so I'm standing there,
> noting the spindle had stopped and jon's servo amp was singing as it
> overload regulated.  Stopped lcnc, loosened the chuck to release the
> tap, ran the head up 6" or so, and unscrewed the tap from the hole.
> Threads look great, but I suspect there is not a 7mm cap screw about in
> these here parts.  Pure unobtainium comes to mind for the alloy. :)
>
> So, just out of curiosity, are 7mm bolts really that hard to find, or am
> I looking in the wrong local stores?
>
> NAPA perhaps?  Pricy there though.  Seems metric in the label makes them
> an additional $2 a bolt or nut.  Been there, done that. Should have
> gotten a free t-shirt for the price I paid for a 6 pack of 8mm self
> lockers. Bah.
>
> Home Depot, up in Bridgeport, 26 miles up the Super-Pot-Hole, aka I-79
> has the best stock ATM, but I cannot recall seeing any 7's. 8's I can
> probably get locally at Tractor Supply.  In a decent alloy even.
>
> I also think my 8mm tap is a lot sharper than the black oxide finished
> 7mm is, so maybe I can get by driving it with the mill.  We'll find out
> tommorrow.
>
> Thanks everybody.
>
> Cheers, Gene Heskett


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Re: [Emc-users] Special cables

[Peter Blodow]

Pretty good mailgroup cooperation!
Peter

Am 18.04.2016 19:31, schrieb Dave Cole:
> On 4/18/2016 12:44 PM, andy pugh wrote:
>> On 18 April 2016 at 17:27, Peter Blodow <p.blo...@dreki.de> wrote:
>>> Use Oilflex cable, the only
>>> manufacturer I know is Lapp cable in Germany.
>> Indeed, and in Germany you can buy t by the meter from Conrad:
>> https://www.conrad.de/de/Search.html?search=olflex
>>
>> It it much cheaper from Conrad than from Rapid, too.
> Automation Direct in the US sells Polyurethane cables for prox switches
> etc that are oil resistant and they are finely stranded and cheap.
> Igus also sells a super flex  cable like Lapp but I have no idea what
> the cost comparison is.   Igus and Lapp are both not cheap.
> Igus in the US will sell direct to end users via their website.
>
> Dave
>
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Re: [Emc-users] Special cables

[Peter Blodow]

Andy,
any PVC cable will be damaged by oil environment as the softeners 
(phthalates) are dissolved or washed out by the oleic acids and oleates, 
hardening the insulation and thus adding flexure strain to the copper 
strands. Caoutchouc (india rubber or synthetic rubber) cables will in 
turn soften and become gooey and sticky. Use Oilflex cable, the only 
manufacturer I know is Lapp cable in Germany.

In addition, cheap cables (such as used in cars for financial reasons) 
contain copper alloys that tend toward bronze properties which makes 
them break in places with frequent flexure (e.g., car doors). These 
copper alloys harden cold by deformation so they will flex besides the 
place where they were flexed last time, until the cable core also turns 
inflexible. Often these cheap cables contain only few, but heavy strands 
(e.g., 12 to 16) instead of 50 to 100 fine wires. In all of our japanese 
rice cars I had to splice the cables to the tail lights after part of 
their lifetime. Regularly, I replaced them with fine stranded laboratory 
cables.

Regards
Peter

Am 18.04.2016 14:01, schrieb andy pugh:
> On a CNC machine it is worth considering the oil resistance of cables.
> Also, if mounted in a drag-chain you my need to use especially
> flexible cables. (I replaced the prox wires in my Chinese lathe for
> the second time this weekend, the standard cable that comes bonded
> into the cheap prox switches seems to have limited life when flexed).
>
> On the Holbrook I am trying to make a somewhat higher-quality job of
> things, and that includes trying to source the right cabling.
>
> A useful source (in the UK) is Rapid Electronics who seem to have
> access to the inventory of Conrad Electronics, and who sell cables by
> the metre. This is useful, as these cables run to £100s or even £1000s
> per reel.
> For Smart Serial devices, and anything else using CAT5 cables these
> are probably ideal (the PUR sheathed variants)
>
> http://www.rapidonline.com/lappkabel-2170297-unitronic-ethernet-blue-data-cable-4x2x0-22mm-od-6-3mm-49-1788
> (see the table at the bottom for variations)
>
> For cables in drag chains they have a special section:
> http://www.rapidonline.com/drag-chain-cable
>
> Of those this one is probably ideal for Modbus:
> http://www.rapidonline.com/lappkabel-unitronic-bus-pb-fd-p-violet-cable-555062
>
> And this for resolver/encoder data:
> http://www.rapidonline.com/lappkabel-6fx8008-green-data-cable-555138
>
> However, an even cheaper option for Modbus seems to be musician-rated
> cable. I have installed some of this and it works very well for my
> VFD.
> http://www.ebay.co.uk/itm/141838984494
>
>


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Re: [Emc-users] Replacing Fanuc controller on Johnford VMC-500 mill

[Peter Blodow]

Dave,
we have a server domain www.kontent.de which hosts our accounts, look it 
up. I don't know where the firm is situated, supposedly here in Germany. 
I still have a ISDN telephone line although the German Telekom tends to 
abolish them all, but can't everywhere because of bad and long telephone 
lines (ours is more than 7 km) with high signal suppression. Now, German 
Telekom is gradually digging better cables so we expect to get fast DSL 
by next year. I don't know how things will be developing then. Anyway, 
since nobody knows our domain we receive almost no spam nor spoof.

Regards
Peter

Am 10.04.2016 17:10, schrieb Dave Cole:
> Who hosts your domain?   Here in the US most DSL providers no longer
> allow a SMTP server on their networks so although I can setup a Pop mail
> server
> to receive mail, I can't send mail without using a SMTP server external
> to my actual hardware server.This was done supposedly to minimize
> spam coming from their network, but I think it has been ineffective
> other than to inhibit legitimate users of their services.
>
> Dave
>
> On 4/10/2016 6:41 AM, Peter Blodow wrote:
>> Gentlemen,
>> I wonder why everybody makes a fuss of mail providers or the like.
>> Together with a friend, we made up our own domain many years ago, and we
>> never had any problem mailing and sending anything with attachments of
>> unlimited size to and from there. We host about 15 mail accounts, all
>> friends and relatives. This costs us about 20 Euros per year. In
>> addition, we have more than 2 GB web space per acount. Anyone can do that.
>>
>> Peter Blodow
>>
>>
>> On Sunday 10 April 2016 04:15:57 Gregg Eshelman wrote:
>>>> Links got stripped. Search eBay and ye shall find. :)
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Re: [Emc-users] Replacing Fanuc controller on Johnford VMC-500 mill

[Peter Blodow]

Gentlemen,
I wonder why everybody makes a fuss of mail providers or the like. 
Together with a friend, we made up our own domain many years ago, and we 
never had any problem mailing and sending anything with attachments of 
unlimited size to and from there. We host about 15 mail accounts, all 
friends and relatives. This costs us about 20 Euros per year. In 
addition, we have more than 2 GB web space per acount. Anyone can do that.

Peter Blodow


On Sunday 10 April 2016 04:15:57 Gregg Eshelman wrote:
>> Links got stripped. Search eBay and ye shall find. :)
>


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Re: [Emc-users] Modbus wiring

[Peter Blodow]

... because this will be different from all other kinds of cables. 
Imagine large facilities, dozens of buildings, with thousands of devices 
being controlled by a central control room, wired by random cable 
colours. These are being mixed with current supply, LAN, telephone and 
all other cables together on a cable way... I was one of these customers 
who urged the companies and the DIN authorities to use easily 
identifiable cables for building control.

Peter Blodow



Am 01.04.2016 21:07, schrieb Dave Cole:
> Profibus is basically an RS485 network as well. I have no idea why 
> they used a purple jacket color. Dave 

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Re: [Emc-users] Spur gear transmission

[Peter Blodow]

If the blue and red arrows are to signify direction of rotation, there 
is a booboo in the gear drawing, they must be of opposite rotation.
Peter

Am 02.03.2016 15:52, schrieb Tomaz T.:
> I'm working on design and analysis of spur gear transmission with the help of 
> Solidworks. What I need to do is 10:1 transmission ratio, using module 1 size 
> spur gears.
> Here is what I simulated in SW:
> - 12 teeth spur gear generated from SW toolbox- 120 teeth spur gear generated 
> from SW toolbox- 10RPM motor applied to smaller spur gear- 1Nm force applied 
> to bigger spur gear (simulating some constant friction in opposite direction 
> of rotation)
> Image: https://www.dropbox.com/s/r13c84ob2ov7dvh/Gearing_1.jpg?dl=0
> After running simulation and plot graph of angular velocities, reading is 
> this (blue line is bigger spur):
> Image: https://www.dropbox.com/s/j59pc4cbss3ldhj/Graph_1.jpg?dl=0
>
> Is this normal that transmitted velocity isn't linear anymore, or is there 
> something wrong with analysis or maybe SW generated spur gears are not 
> suitable?
>
>
>
>
>   
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Re: [Emc-users] Stake in ball screw Cincinnati Arrow

[Peter Blodow]

It wasn't the recycling, but certain softening compounds in PVC were 
suspected to cause cancer and reduced by law. This war aimed at 
children's toys and other playstuff, but hit wire insulation as well 
(though nobody would use wire insulation for a lolly). Furthermore, 
machine oil and above all cooling compounds would dissolve and remove 
the new softeners more readily than the old ones, leaving hard PVC. Same 
problem is with rubber insulation, too. There are oilproof cables, 
though, Oelflex brand (made by Lapp Cables) for instance.
Peter

Am 29.02.2016 14:25, schrieb BRIAN GLACKIN:
> A note on German wiring from the early 1990's.  At that time the Green
> Party came in and pushed fro higher recycling.  Many manufacturers went
> with a higher recycled content in their wire insulation to meet the edict.
> Mercedes Benz was one of the earliest hit by this change.  Harness in the
> W124 line of vehicles in 1993-1995, were failing after 2 years in service.
> The recycled content made the covering brittle with exposure to heat in the
> near term and generally shorter lifetimes.  Sounds like this hit machine
> parts as well from that era.
>
>
>


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Re: [Emc-users] Any idea how they machine these?

[Peter Blodow]

In other words, you pretend to cut a left-hand thread but have the 
machine run in reverse so it turns out right hand?
Peter Blodow

Am 08.02.2016 11:42, schrieb Marcus Bowman:
> On 8 Feb 2016, at 10:04, andy pugh wrote:
>
>> On 7 February 2016 at 23:37, Marcus Bowman
>> <marcus.bow...@visible.eclipse.co.uk> wrote:
>>
>>> Easy. mount the tool upside down, and start at the blind bottom.
>> Sorry, I am not quite understanding your description?
>>
> Yes; apologies; my rather quick response was a bit cryptic...
>
> For an internal right-hand thread, the problem is often that the tool feeds 
> into the hole from the right, and bumps into the bottom of the hole. It would 
> be the same for an external thread bumping into a shoulder on the left.
> Machine the hole to the ID for the minor diameter of the internal thread, 
> then create a clearance groove of 1 pitch width, and just deeper than the 
> thread height, at the bottom of the hole. That blind bottom still a problem 
> if your reactions are as slow as mine, so, unless you have auto-disengagement 
> for the leadscrew, avoid the problem by cutting the thread from left to 
> right, starting with the tool in the clearance groove, applying a cut, and 
> feeding outwards into fresh air.
> Run the spindle in reverse.
> The tool can either be mounted against the front wall, upright; or can be 
> mounted against the rear wall, but inverted.
> (I think I have those the right way around...)
> I've used this method on both internal and external threads, with front and 
> rear toolposts and with the tools the right way up or upside down, to suit 
> the directions of cut,and it works a treat. The key is to cut away from the 
> blind end or the shoulder (and to take care with spindle direction and tool 
> orientation, both of which can cause local overheating of the brain's 
> visualisation processing area).
> All much easier with CNC I dare say...
>
> Marcus
>
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Re: [Emc-users] Prempt RT on Linux Mint

[Peter Blodow]

Yeah, and these "skewy" bits were the reason why in the days of parallel 
bus connections all operations had to be acknowledged on separate wires 
so it was made sure the bits had arrived correctly. This made 
connections slow, but terribly reliable. The DEC computer series like 
the VAXes were an example. This reliability was given up for the sake of 
speed, but at the same time, useless games becoming dominant in the 
computer world, it did not matter any more.

Peter

Am 04.02.2016 05:30, schrieb Chris Albertson:
> ...
>> Buses are changing from mostly parallel to serial. PCI is going that way
>> and USB3.x is very promising. It's direction most computer vendors are
>> taking. Simplifies cabling over longer distances if nothing else.
> I went to school (computer engineering) in the late 70's' and early
> 80's back then parallel was always faster.  When serial busses started
> outperforming parallel wires I was puzzled for a while then read up
> some.  The reason for serial being faster is easy,   There is no
> chance of "bit skew" with serial.   Bit Skew is when you have a
> parallel cable and some bits travel "faster" because not all
> conductors in the cable are equal.  Your max speed is limited by worst
> possible case skew.


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Re: [Emc-users] Mesa Reseller in America

[Peter Blodow]

Congratulations, John! Wish someone would have the guts to do that here 
in old Germany, too!

Peter


Am 01.02.2016 23:14, schrieb John Thornton:
> I just want to announce that I'm going to be a Mesa Electronics reseller
> in America. I just got conformation on my first stocking order should be
> here Friday February 5th. As soon as I get everything checked in the
> store will be up and running. www.mesaus.com
>
> Thanks
> JT
>
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Re: [Emc-users] collets for this motor?

[Peter Blodow]

I can very well understand Gene's feelings :-) This method of fastening 
chucks was used before self-centering chucks were introduced, chucks 
weren't supposed to be changed a lot at all. It has been used on 
dividing heads longer than on lathes and has long been replaced by the 
camlock system.
Peter

Am 31.01.2016 10:41, schrieb Andy Pugh:

>
>> On 29 Jan 2016, at 22:49, Gene Heskett  wrote:
>>
>> fits the rim of the flange, and are tapped for 3
>> 6mm studs that come thru 3 holes in the flange.
> There is a variant on that that is a DIN standard, with the important 
> difference that the holes in the flange are keyhole shaped. (And back counter 
> bored for a two-direction lock)
>


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