Re: [Emc-users] Hardinge Conquest 42 Conversion

[Jon Elson]

On 12/07/2015 11:02 PM, Jeremy Jones wrote:
> Thanks everyone. Sarah, thanks for that great link. Not sure how I haven't
> come across that yet. I'm gonna look into everything. Thinking I might just
> got this route off the bat. Looking it might be a minimum of $1500 to fix
> the controls. I think the LCNC electronics will be cheaper..I hope. Want to
> get it up and running rather quickly as this will be put into service right
> away.
These look like they have a pretty OLD control.  Unless you 
are really experienced in fixing this kind of gear, it could 
just keep on having (expensive) problems.  They just keep 
getting flakier as they get older.
Some people are using my Pico Systems gear to run some older 
Hardinge HNC machines.
> Anyone know the possibilty of switching one of these over to single phase
> during the conversion? I'm guessing the spindle drive is 3 phase. Would
> need to see it to know for sure. Don't have it in hand yet.
>
>
You can run most VFDs from single-phase power if you derate 
them. So, for a 5 Hp motor, you'd get a 7.5 or 10 Hp VFD.  
I'm doing this in my shop on a mill and lathe.  (There are a 
few VFDs that will detect the lost phase and won't run.)  
Also, the servo drives may be taking 3 phase power, this 
possibly could be a bigger problem to run  on single phase.

Jon

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Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

[Peter C. Wallace]

On Mon, 7 Dec 2015, Mark Johnsen wrote:


Date: Mon, 7 Dec 2015 21:46:11 -0800
From: Mark Johnsen 
Reply-To: "Enhanced Machine Controller (EMC)"

To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

Stephen,


Can you post a link to the entire dmesg list after you get a sserial error?

(clearing the log before you start linuxcnc )

that is from a terminal window:

sudo dmesg -C  (clear the existing messages)

(run linuxcnc until you get the sserial error)

dmesg > log.txt

and post log.txt



I have the same issue and haven't been able to find a solution when I
upgraded from 2.6.8  (?) to 2.7.0.  First I updated the firmware on my 5i25
& 7i77.  When I would run 2.7.0 I would get the following communication
error.
[   87.831899] hm2/hm2_5i25.0: Smart Serial Comms Error: There have been
more than 1 errors in 10 thread executions at least 200 times. See other
error messages for details.
[   87.831908] hm2/hm2_5i25.0: ***Smart Serial Port 0 will be stopped***

 I could jog anywhere from 2 seconds to 10 seconds and LinuxCNC would
inform me of the error and shut down the 7i77 card.  Only way to restart
was to restart linuxcnc (that I found).

The suggestion was that the 5vdc power supply powering the 7i77 was the
problem potentially drawing too much current and lowering the voltage
outside the 7i77 10% 5vdc range.  I had been running the 7i77 from the PC
through the 5i25 and over the cable and doing this for months.  So, I first
tried a 3amp 5Vdc wal wart (that I bought at some electronic store for too
much$$$) and that didn't make a difference, then I bought a meanwell 5vdc
power supply from jameco.  I would say that the meanwell holds a steady
5.1Vdc, but that didn't work either.

I did upgrade to 2.7.2 and that seemed to work better.  At least I could
jog longer or even run a program, but in the end, I still got the
communication errors.  When I did run the program, I had a 24vdc Ice cube
relay (omron, idec type) for the lube pump and I had pulled it and didn't
use it (too much lube).  I wonder if that was an issue because I had
forgotten I had it out, put it in the relay socket 2/3rds through a
program, and at the END of my cnc program, I got the errors for the
communication.  In the mesa 7i77 manual, it does say that the 24vdc outputs
do NOT need diodes, which I would normally use for a relay like this.  Not
sure I need it.  Didn't add one, but I didn't think that would be the
problem.

Anyway, I have 2 harddrives that I swap between now and have the latest
2.6.11 (or is 10, I forget) on one harddrive and I can run that all day
long.  The 2nd harddrive has 2.7.2 and I don't run it at the moment because
I don't feel comfortable that it will work.  I had been meaning to
troubleshoot more and re-install the 2.7.2 harddrive (and upgrade to
2.7.3), but haven't gotten round tuit it...

One thing that I don't understand is that in the 2.7 upgrade instructions,
there's a line item:
2.1.2. Hostmot2 dpll
The Hostmot2 dpll??s default time constant has been changed from 40960 to
2000. The original value could occasionally lead to following errors when
software like ntpd and ntpdate adjusted the rate of the linux
CLOCK_MONOTONIC time source by up to 1000ppm in a single step. The new
value allows the dpll to adjust to the change in the base period frequency
without error.

I don't know enough to know how that affects me, nor if that would be a
problem (probably not), but it's a statement and I didn't do anything for
it in the upgrade (like removing pet_watchdog).

Anyway, I hope we can find a solution, I'm a bit perplexed by it...  I
can't look at it too much this week, but maybe next I can work on it more.

Oh - one more thing is that I did have in my possession for about 1 week
(thank you Peter & Katherine!) a brand new 5i25/7i77 combo and got the same
errors.  So, we're apparently doing something here, just not sure what it
is.

Regards,
Mark




--


Message: 3
Date: Mon, 7 Dec 2015 21:29:54 -0500
From: Stephen Dubovsky 
Subject: Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update
To: "Enhanced Machine Controller (EMC)"

Message-ID:
<
caopja+aqe_4hdozokhsnwggkwiy7vseftjzgzwmgqdfzdrq...@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8

Ok, updated the 7i77 per your instructions.  That seemed to work.  It got
rid of the messages when 2.7.3 starts up.  So far so good,

When I now F2 enable the machine I get a slew of "hm2/hm2_5i25.0: Smart
serial card hm2_5i25.0.7i77.0.0 error = (4) Extra character" each with a
..."error = (13) Communication error"

Looks like something is still mismatched?

FWIW, it looks like the 5i25 is ver 1.43.  Newer than it was, though not
sure if that is the latest.

Thank you,
Stephen

On Mon, Dec 7, 2015 at 12:06 AM, Stephen Dubovsky 
wrote:

> Thank you! Will try it 

Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

[Mark Johnsen]

Stephen,

I have the same issue and haven't been able to find a solution when I
upgraded from 2.6.8  (?) to 2.7.0.  First I updated the firmware on my 5i25
& 7i77.  When I would run 2.7.0 I would get the following communication
error.
[   87.831899] hm2/hm2_5i25.0: Smart Serial Comms Error: There have been
more than 1 errors in 10 thread executions at least 200 times. See other
error messages for details.
[   87.831908] hm2/hm2_5i25.0: ***Smart Serial Port 0 will be stopped***

 I could jog anywhere from 2 seconds to 10 seconds and LinuxCNC would
inform me of the error and shut down the 7i77 card.  Only way to restart
was to restart linuxcnc (that I found).

The suggestion was that the 5vdc power supply powering the 7i77 was the
problem potentially drawing too much current and lowering the voltage
outside the 7i77 10% 5vdc range.  I had been running the 7i77 from the PC
through the 5i25 and over the cable and doing this for months.  So, I first
tried a 3amp 5Vdc wal wart (that I bought at some electronic store for too
much$$$) and that didn't make a difference, then I bought a meanwell 5vdc
power supply from jameco.  I would say that the meanwell holds a steady
5.1Vdc, but that didn't work either.

I did upgrade to 2.7.2 and that seemed to work better.  At least I could
jog longer or even run a program, but in the end, I still got the
communication errors.  When I did run the program, I had a 24vdc Ice cube
relay (omron, idec type) for the lube pump and I had pulled it and didn't
use it (too much lube).  I wonder if that was an issue because I had
forgotten I had it out, put it in the relay socket 2/3rds through a
program, and at the END of my cnc program, I got the errors for the
communication.  In the mesa 7i77 manual, it does say that the 24vdc outputs
do NOT need diodes, which I would normally use for a relay like this.  Not
sure I need it.  Didn't add one, but I didn't think that would be the
problem.

Anyway, I have 2 harddrives that I swap between now and have the latest
2.6.11 (or is 10, I forget) on one harddrive and I can run that all day
long.  The 2nd harddrive has 2.7.2 and I don't run it at the moment because
I don't feel comfortable that it will work.  I had been meaning to
troubleshoot more and re-install the 2.7.2 harddrive (and upgrade to
2.7.3), but haven't gotten round tuit it...

One thing that I don't understand is that in the 2.7 upgrade instructions,
there's a line item:
2.1.2. Hostmot2 dpll
The Hostmot2 dpll’s default time constant has been changed from 40960 to
2000. The original value could occasionally lead to following errors when
software like ntpd and ntpdate adjusted the rate of the linux
CLOCK_MONOTONIC time source by up to 1000ppm in a single step. The new
value allows the dpll to adjust to the change in the base period frequency
without error.

I don't know enough to know how that affects me, nor if that would be a
problem (probably not), but it's a statement and I didn't do anything for
it in the upgrade (like removing pet_watchdog).

Anyway, I hope we can find a solution, I'm a bit perplexed by it...  I
can't look at it too much this week, but maybe next I can work on it more.

Oh - one more thing is that I did have in my possession for about 1 week
(thank you Peter & Katherine!) a brand new 5i25/7i77 combo and got the same
errors.  So, we're apparently doing something here, just not sure what it
is.

Regards,
Mark


--
>
> Message: 3
> Date: Mon, 7 Dec 2015 21:29:54 -0500
> From: Stephen Dubovsky 
> Subject: Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update
> To: "Enhanced Machine Controller (EMC)"
> 
> Message-ID:
> <
> caopja+aqe_4hdozokhsnwggkwiy7vseftjzgzwmgqdfzdrq...@mail.gmail.com>
> Content-Type: text/plain; charset=UTF-8
>
> Ok, updated the 7i77 per your instructions.  That seemed to work.  It got
> rid of the messages when 2.7.3 starts up.  So far so good,
>
> When I now F2 enable the machine I get a slew of "hm2/hm2_5i25.0: Smart
> serial card hm2_5i25.0.7i77.0.0 error = (4) Extra character" each with a
> ..."error = (13) Communication error"
>
> Looks like something is still mismatched?
>
> FWIW, it looks like the 5i25 is ver 1.43.  Newer than it was, though not
> sure if that is the latest.
>
> Thank you,
> Stephen
>
> On Mon, Dec 7, 2015 at 12:06 AM, Stephen Dubovsky 
> wrote:
>
> > Thank you! Will try it tomorrow evening.
> > On Dec 6, 2015 11:33 PM, "Marius Alksnys" 
> > wrote:
> >
> >> Stephen,
> >>
> >> you should download "Version 14 serial remote I/O card firmware" from
> >> www.mesanet.com, under ANYTHING I/O DAUGHTER CARDS, unzip it, and
> follow
> >> the README file in sserial/utils/linuxcnc.
> >>
> >> So, you will need ssinstall script and a special script, called
> update7i77
> >>
> >> 12/07/2015 06:03 AM, Stephen Dubovsky ra??:
> >> > Hello all,
> >> > Upgraded the Ubuntu mill (2.5?) to 2.7.3.  

Re: [Emc-users] Hardinge Conquest 42 Conversion

[andy pugh]

On 7 December 2015 at 13:19, Stuart Stevenson  wrote:
>
> The harder and correct answer is 'not until you make it do it'.

Having said that, the sequence required for a lathe is rather simpler
than for a milling machine.

The "carousel" HAL component can do a lot of the work:
http://linuxcnc.org/docs/2.7/html/man/man9/carousel.9.html

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[Emc-users] Lathe spindle encoder drive

[andy pugh]

I have a lathe with a moderately large spindle. I want to drive an
encoder (well, actually, a resolver) at a 1:1 ratio from this.

The obvious way is with a 1:1 gear set, or a belt, but that does
involve really quite a large gear on the weeny resolver shaft.

I have been thinking about a 200:1 worm drive for an auxilairy
resolver for absolute Z-axis positon feedback (I want to eliminate Z
homing moves) and it occurred to me to wonder if a 1:1 ratio worm
drive is possible, with the wheel much smaller than the worm.

So, I modelled a 10-start worm and a 10-tooth wheel in CAD, and it
wasn't long before I realised that I was designing something that I
have seen before. A speedometer drive.

http://www.ebay.co.uk/itm/251440255353

Now to find one with the right ratio and bore size.

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Re: [Emc-users] Linuxcnc on Fujitsu Siemens FUTRO S400

[andy pugh]

On 7 December 2015 at 14:22, Paul Lacatus (Personal)
 wrote:

>  I found a thin client computer from  Fujitsu
> Siemens Futro S400 that has the 1GB CF card ( the "hard drive") defective
> and my ideea is to use it for linuxcnc computer. One solution is to use a
> bigger card of 8 GB for installing the linuxCNC   and nfs volumes on a
> server for data .

I have found that an 8GB flash drive is adequate for both OS and the
G-code files. G-code files are quite small in the grand scheme of
things.

You can make more space by deleting the multimedia andOffice apps from
the default OS install.

One thing you can't delete is the Orage calendar. GTK depends on Orage
(No, I have absolutely no idea why) and the GUI depends on GTK.
So, if you delete Orage and then do an autoremove, you make lots of
disk space, but can't run any GUI apps at all.
Don't Ask Me How I Know.


-- 
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Re: [Emc-users] Hardinge Conquest 42 Conversion

[Stuart Stevenson]

On Sun, Dec 6, 2015 at 2:46 PM, Jeremy Jones  wrote:

>  Does LCNC support ATCs?
>
>
The easy answer is 'yes'.

The harder and correct answer is 'not until you make it do it'.

Take your right forefinger and thumb and pinch your right earlobe. Hold
that for a little while.
Take your left forefinger and thumb and pinch your left earlobe. Hold that
for a little while.
Now, the matter sitting between your hands is the limitations of LinuxCNC.
:)

Have fun
Stuart

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Re: [Emc-users] Poor mans soft turnon

[Ken Strauss]

"Thermistor" is the generic name for a device that changes resistance with
temperature. I believe that they are available as both NTC and PTC
(negative/positive temperature coefficient) devices. As noted in my earlier
email with the TM symbol a "Surgistor" is a name trademarked by Stetron that
has now expired. For the gory details see
https://trademarks.justia.com/734/96/surgistor-73496193.html

> -Original Message-
> From: Gene Heskett [mailto:ghesk...@wdtv.com]
> Sent: Sunday, December 06, 2015 11:43 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] Poor mans soft turnon
>
> On Sunday 06 December 2015 22:57:52 Rafael wrote:
>
> > On 12/06/2015 07:25 PM, Gene Heskett wrote:
> > > Greetings all;
> > >
> > > Before tv's lost their crt's, there was a component in the power
> > > inlet circuit that had a very high negative temp coefficient, which
> > > was used to create a high voltage drop when it was cold, which in
> > > turn forced the first few seconds of its power draw after being
> > > turned on, thru the degaussing coils wrapped around the crt in order
> > > to demagnetise it.
> > >
> > > That voltage drop heated it, and it got hot enough to get down to
> > > just a couple of ohms, which was not enough to overcome the MOV in
> > > series with the coils.  This also allowed the tv itself to be
> > > soft-started, and it worked so well that it was often the major part
> > > failure in the tv for the first 3 or 4 years.
> > >
> > > About 3 or 4 of those, wired in parallel, would also serve as an
> > > inrush limiter when I turn on the power supply for my G0704 mill.
> > > But the parts houses we had locally have all evaporated.  I just
> > > checked a couple surplus places without finding any of those
> > > critters.
> > >
> > > Does anyone have a suggestion as to where a small handfull of these
> > > could be sourced?  Usually bare, they look like a graphite quarter
> > > coin with a lead wire soldered to the middle of a silver plated dot
> > > in the middle of each face.  Usually slightly thicker than a
> > > 'merican quarter.
> >
> > I think you are looking for NTC (Negative Temperature Coefficient).
> > Search brings back numerous links to choose from. However, there are
> > better solutions but cost a bit more of course.
>
> Yes, and contrary to a previous poster, the name isn't a Surgistor, but a
> "Thermistor" for the NTC component.
>
> > Here is an excellent article/solution I found searching for "inrush
> >current limiter":
> > http://www.edn.com/design/analog/4316203/Simple-and-effective-inrush-c
> >urrent-limiter-stops-surges
> >
> Unforch, they do not seem to want to feed iceweasel the pdf.
>
> > Circuit is simple enough to implement it on a generic experimental
> > board.
>
> Left coast. I assume you are getting in practice at ducking behind
something
> solid. :)
>
> Thanks Rafael.
>
> 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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Re: [Emc-users] Linuxcnc on Fujitsu Siemens FUTRO S400

[andy pugh]

On 7 December 2015 at 14:22, Paul Lacatus (Personal)
 wrote:
> Right now the computer is a tower PC with a celeron 900MHz that is bigger
> than the MF70


An alternative to this if the disparate sizes of the machine and the
controller are a problem, might be one of the VESA mount mini-ITX
computer cases, and a known-good mini-ITX board.

Then you can hide the PC behind the minotaur. (or, for less Classical
danger, behind the monitor (I liked the typo)).

For even more littleness, the BeagleBone Black and Machinekit might be
an option.

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Re: [Emc-users] Poor mans soft turnon

[Jon Elson]

On 12/07/2015 06:11 AM, Gene Heskett wrote:
> I definitely need to restore some means of bleeding them 
> off when powered down. IIRC I saw some mini-candelabra 
> sockets at Wallies a while back so I need to get 2 of them 
> and put a lamp across each half of the supply. Its 2 in 
> series and 2 of those in parallel. You can see the jumpers 
> between the buss bars in the pix.
I would just get some vitreous enamel resistors.  They are 
not that expensive, even new.  Something like a 5 W 6 K Ohm 
resistor, Digi-Key 45F6K0E is about $1.86.

Jon

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Re: [Emc-users] Linuxcnc on Fujitsu Siemens FUTRO S400

[Jon Elson]

On 12/07/2015 08:22 AM, Paul Lacatus (Personal) wrote:
> Hi everybody,
>
> I am using for some time Linux CNC on a small proxxon MF70 
> for small PCB or small faceplate . Right now the computer 
> is a tower PC with a celeron 900MHz that is bigger than 
> the MF70.  I found a thin client computer from  Fujitsu 
> Siemens Futro S400 that has the 1GB CF card ( the "hard 
> drive") defective  and my ideea is to use it for linuxcnc 
> computer. One solution is to use a bigger card of 8 GB for 
> installing the linuxCNC   and nfs volumes on a server for 
> data . The specs for the computer are in the attached pdf 
> file . Has somebody experience of using linuxcnc on thin 
> client computers ?
>
Apparently, it has a printer port, so that is how you'd 
connect the motion hardware.  The processor speed is not 
horrible, but not up to the latest tech, either.  256 MB of 
main memory is not enough, 512 MB is pretty iffy, and you 
would likely have to run one of the older versions of 
LinuxCNC.  It isn't clear how much memory your specific unit 
has.  if more than 512 MB, you are probably OK.

The remaining thing is how good the latency test is, the 
only way to know is to try it.

Jon

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Re: [Emc-users] Lathe spindle encoder drive

[andy pugh]

On 7 December 2015 at 15:54, Sarah Armstrong
 wrote:
> how did your cad turn out


https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmyPJy0liipFm0?feat=directlink

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Re: [Emc-users] Poor mans soft turnon

[andy pugh]

On 7 December 2015 at 15:53, Jon Elson  wrote:
> I would just get some vitreous enamel resistors.  They are
> not that expensive, even new.

Or higher-power lower-resistance for a faster discharge.
http://www2.mouser.com/search/ProductDetail.aspx?R=0virtualkey0virtualkeyTHS50560RJ

As the capacitance and voltage rise you get to the point that the
bleed-of resistor becomes an electric heater, but I think you may be
below that point.

My mill has 6600uF at 300V, and I wanted a 10 second discharge
That means a 500R resistor,
A 500R resistor permanently across a 300V bus dissipates 180W. And
that's a pretty big resistor. Which is why, in my case, I decided to
only switch-in the resistor at power-off.

With less capacitance, and lower voltage, the power requirement falls
rapidly. (with the square of V).

120V and 3300uF comes out at a far more reasonable 14W with a 1K resistor

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Re: [Emc-users] Lathe spindle encoder drive

[Sarah Armstrong]

interesting Andy
if we can hob one !

On 7 December 2015 at 16:17, andy pugh  wrote:

> On 7 December 2015 at 15:54, Sarah Armstrong
>  wrote:
> > how did your cad turn out
>
>
>
> https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmyPJy0liipFm0?feat=directlink
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
> --
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Re: [Emc-users] Lathe spindle encoder drive

[Stephen Dubovsky]

I *THINK* if you incline your resolver gear you can use a straight cut
gear.  IIRC, the sum of helix angles must add up to the shaft angles.  In
your picture the shaft angles are 90deg so one helix is something like
80deg (the large gear) and the other is 10deg (the small gear).  You can do
the same w/ a 80deg and 0 deg if you incline your resolver 10deg.  Is there
a need to mount the resolver exactly vertical?

Makes cutting the gears really easy.  The large gear can be cut w/ a form
tool on a lathe just like you were cutting any other screw and the little
one can be easily bought (or cut using conventional gear cutter and indexer)

On Mon, Dec 7, 2015 at 11:17 AM, andy pugh  wrote:

> On 7 December 2015 at 15:54, Sarah Armstrong
>  wrote:
> > how did your cad turn out
>
>
>
> https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmyPJy0liipFm0?feat=directlink
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
> --
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Re: [Emc-users] Lathe spindle encoder drive

[Sarah Armstrong]

this is on my todo list for my lathe too
how did your cad turn out , interesting too



On 7 December 2015 at 15:46, andy pugh  wrote:

> I have a lathe with a moderately large spindle. I want to drive an
> encoder (well, actually, a resolver) at a 1:1 ratio from this.
>
> The obvious way is with a 1:1 gear set, or a belt, but that does
> involve really quite a large gear on the weeny resolver shaft.
>
> I have been thinking about a 200:1 worm drive for an auxilairy
> resolver for absolute Z-axis positon feedback (I want to eliminate Z
> homing moves) and it occurred to me to wonder if a 1:1 ratio worm
> drive is possible, with the wheel much smaller than the worm.
>
> So, I modelled a 10-start worm and a 10-tooth wheel in CAD, and it
> wasn't long before I realised that I was designing something that I
> have seen before. A speedometer drive.
>
> http://www.ebay.co.uk/itm/251440255353
>
> Now to find one with the right ratio and bore size.
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
> --
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Re: [Emc-users] Lathe spindle encoder drive

[John Kasunich]

Clever.

Doesn't really need to be 1:1.  If the spindle makes 2, or 3, or 4 revs per
each rev of the encoder it would still work just fine even for threading.
A non-integer would be a problem though.


On Mon, Dec 7, 2015, at 10:46 AM, andy pugh wrote:
> I have a lathe with a moderately large spindle. I want to drive an
> encoder (well, actually, a resolver) at a 1:1 ratio from this.
> 
> The obvious way is with a 1:1 gear set, or a belt, but that does
> involve really quite a large gear on the weeny resolver shaft.
> 
> I have been thinking about a 200:1 worm drive for an auxilairy
> resolver for absolute Z-axis positon feedback (I want to eliminate Z
> homing moves) and it occurred to me to wonder if a 1:1 ratio worm
> drive is possible, with the wheel much smaller than the worm.
> 
> So, I modelled a 10-start worm and a 10-tooth wheel in CAD, and it
> wasn't long before I realised that I was designing something that I
> have seen before. A speedometer drive.
> 
> http://www.ebay.co.uk/itm/251440255353
> 
> Now to find one with the right ratio and bore size.
> 
> -- 
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
> --
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-- 
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  jmkasun...@fastmail.fm

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Re: [Emc-users] Lathe spindle encoder drive

[andy pugh]

On 7 December 2015 at 16:42, Dave Caroline  wrote:
> Hobbing it is the easy bit, keeping the backlash and tooth form error
> out much harder

This might not be as critical as it seems, as the index will occur at
the same point with the same gear teeth in contact every time.

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Re: [Emc-users] Poor mans soft turnon

[Ralph Stirling]

Haas cnc mills use a kitchen stove top heating element
for their spindle braking resistor.  The smaller diameter
elements are about 45 ohms, and the bigger ones 27 ohms.
Wattage is over a kw, as they run at 240vac.  The resistance
is a bit low for a capacitor discharge resistor, but at the
price you could stack a few in series.

Haas mounts them in a metal cage on top of the electrical
cabinet.

-- Ralph

From: andy pugh [bodge...@gmail.com]
Sent: Monday, December 07, 2015 8:13 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Poor mans soft turnon

On 7 December 2015 at 15:53, Jon Elson  wrote:
> I would just get some vitreous enamel resistors.  They are
> not that expensive, even new.

Or higher-power lower-resistance for a faster discharge.
http://www2.mouser.com/search/ProductDetail.aspx?R=0virtualkey0virtualkeyTHS50560RJ

As the capacitance and voltage rise you get to the point that the
bleed-of resistor becomes an electric heater, but I think you may be
below that point.

My mill has 6600uF at 300V, and I wanted a 10 second discharge
That means a 500R resistor,
A 500R resistor permanently across a 300V bus dissipates 180W. And
that's a pretty big resistor. Which is why, in my case, I decided to
only switch-in the resistor at power-off.

With less capacitance, and lower voltage, the power requirement falls
rapidly. (with the square of V).

120V and 3300uF comes out at a far more reasonable 14W with a 1K resistor

--
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http://www.ifixit.com/Manifesto

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Re: [Emc-users] Lathe spindle encoder drive

[Dave Caroline]

Hobbing it is the easy bit, keeping the backlash and tooth form error
out much harder

Dave Caroline

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Re: [Emc-users] Lathe spindle encoder drive

[andy pugh]

On 7 December 2015 at 16:38, Stephen Dubovsky  wrote:
> Makes cutting the gears really easy.  The large gear can be cut w/ a form
> tool on a lathe just like you were cutting any other screw and the little
> one can be easily bought (or cut using conventional gear cutter and indexer)

I can cut a gear with a helix about as easily as a straight one.
https://picasaweb.google.com/lh/photo/n12qECTl-i6jz2xzgGuXWtMTjNZETYmyPJy0liipFm0?feat=directlink
is my setup cutting a kick-starter quadrant.

The question is whether to cut the worm with a form tool or a hob. I
suspect that pitch accuracy would be better if cut with a hob.



-- 
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Re: [Emc-users] Poor mans soft turnon

[Marcus Bowman]

On 7 Dec 2015, at 03:57, Rafael wrote:

> 
> 
> On 12/06/2015 07:25 PM, Gene Heskett wrote:
>> Greetings all;
>> 
>> Before tv's lost their crt's, there was a component in the power inlet
>> circuit that had a very high negative temp coefficient, which was used
>> to create a high voltage drop when it was cold, which in turn forced the
>> first few seconds of its power draw after being turned on, thru the
>> degaussing coils wrapped around the crt in order to demagnetise it.
>> 
>> That voltage drop heated it, and it got hot enough to get down to just a
>> couple of ohms, which was not enough to overcome the MOV in series with
>> the coils.  This also allowed the tv itself to be soft-started, and it
>> worked so well that it was often the major part failure in the tv for
>> the first 3 or 4 years.
>> 
>> About 3 or 4 of those, wired in parallel, would also serve as an inrush
>> limiter when I turn on the power supply for my G0704 mill.  But the
>> parts houses we had locally have all evaporated.  I just checked a
>> couple surplus places without finding any of those critters.
>> 
>> Does anyone have a suggestion as to where a small handfull of these could
>> be sourced?  Usually bare, they look like a graphite quarter coin with a
>> lead wire soldered to the middle of a silver plated dot in the middle of
>> each face.  Usually slightly thicker than a 'merican quarter.
>> 
> 
> I think you are looking for NTC (Negative Temperature Coefficient). 
> Search brings back numerous links to choose from. However, there are 
> better solutions but cost a bit more of course.
> 
> Here is an excellent article/solution I found searching for "inrush 
> current limiter":
> http://www.edn.com/design/analog/4316203/Simple-and-effective-inrush-current-limiter-stops-surges
> 
> Circuit is simple enough to implement it on a generic experimental board.
> 
>> When I was setting up the mill, and building that supply, I had wired up
>> a 4 plex on the wall behind it, putting it by itself on a 20 amp
>> breaker.  Turning it on, trips the 20 instantly as the motor supply has
>> a huge amount of microfarads, probably in excess of 80,000 uf, mainly
>> because that was the size of the caps I could source, NOS, locally by
>> the fine old art of horse trading.
> 
> One variation of the above circuit could have a resistor/relay on the 
> large capacitors side to limit the inrush current then short the 
> resistor when they are at 70%+ voltage.
> 

That's similar to the PSU I built. It uses a pull-in relay (if that's the right 
term) which only latches once the supply has come up to voltage. The inrush 
current heats a metal-cased resistor and a thermistor senses the heat. The 
resistor limits the inrush to the capacitor. Once it has charged, the relay 
latches on. It only takes a second, but its enough to give an effective 
soft-start. The PSU runs 79volts at 40 amps, and uses two large toroidal 
transformers, powering a pair of steppers off each.  The specs are complete 
overkill. The start-up current is only the holding torque of the size 42 
steppers when the machine is stationary. The spindle motor is completely 
separate and has its own electronics and PSU, so that's not part of the 
equation. It only runs 2kW, so is not a problem. Soft-start there too, and 
electronic speed control, but a manufacturer-supplied control circuit.
 
Marcus

>> 
>> So, while it draws less than 3 amps with the spindle motor off, and could
>> reach 18 if the motor was in a LR state, but it takes a 30 amp breaker
>> to withstand the in-rush. If I could find some of these critters,
>> building them into that motor supply, I could put the 20 amp breaker
>> back in and it wouldn't be quite so ill eagle if an inspector looked it
>> over.
>> 
>> Cheers, Gene Heskett
>> 
> 
> Greetings from the left coast.
> 
> -- 
> Rafael
> 
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Re: [Emc-users] Poor mans soft turnon

[Gene Heskett]

On Monday 07 December 2015 05:29:15 andy pugh wrote:

> On 7 December 2015 at 03:25, Gene Heskett  wrote:
> > About 3 or 4 of those, wired in parallel, would also serve as an
> > inrush limiter when I turn on the power supply for my G0704 mill.
>
> http://uk.rs-online.com/web/p/thermistors/2118030/
>
> (And similar)
>
> But finding one that is big enough might be harder.
>
> When I built the PSU for my milling machine I put a 100W resistor on
> the inlet line, with a relay to bypass it after a fixed time (using a
> 555 timer).
>
> By a coincidence, I was building a PSU for my lathe this weekend, and
> I have taken a different approach. The drives are Mesa 8i20, and these
> report bus voltage back to HAL. So the new PSU has the internal relays
> controlled by HAL.
> One SSR turns the power on, then another will be closed by HAL when
> the bus voltage has reached a threshold, and at that point the
> ...enable... pins will be toggled.
> The same chunk of HAL will be set up so that the PSU can't be turned
> on unless the bus voltage is <2V. This is to prevent arcing/welding of
> the contacts of a third (mechanical) relay that connects a crowbar
> resistor across the caps when the power goes off.

That was the reason for the night light lamp cobbled into mine, but its 
since burned out, probably from some rigid tapping as Jon's WM servo is 
a full 4 quadrant amplifier, lighting up that lamp well past its normal 
brightness as it reverses the spindle motor.  Those caps under the pcb 
buss bars can hold a surprising charge for an hour or more.

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)
Some mill pix are at:
Genes Web page 

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Re: [Emc-users] Poor mans soft turnon

[andy pugh]

On 7 December 2015 at 03:25, Gene Heskett  wrote:
> About 3 or 4 of those, wired in parallel, would also serve as an inrush
> limiter when I turn on the power supply for my G0704 mill.

http://uk.rs-online.com/web/p/thermistors/2118030/

(And similar)

But finding one that is big enough might be harder.

When I built the PSU for my milling machine I put a 100W resistor on
the inlet line, with a relay to bypass it after a fixed time (using a
555 timer).

By a coincidence, I was building a PSU for my lathe this weekend, and
I have taken a different approach. The drives are Mesa 8i20, and these
report bus voltage back to HAL. So the new PSU has the internal relays
controlled by HAL.
One SSR turns the power on, then another will be closed by HAL when
the bus voltage has reached a threshold, and at that point the
...enable... pins will be toggled.
The same chunk of HAL will be set up so that the PSU can't be turned
on unless the bus voltage is <2V. This is to prevent arcing/welding of
the contacts of a third (mechanical) relay that connects a crowbar
resistor across the caps when the power goes off.

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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Re: [Emc-users] Poor mans soft turnon

[Gene Heskett]

On Monday 07 December 2015 03:24:21 Marcus Bowman wrote:

> On 7 Dec 2015, at 03:57, Rafael wrote:
> > On 12/06/2015 07:25 PM, Gene Heskett wrote:
> >> Greetings all;
> >>
> >> Before tv's lost their crt's, there was a component in the power
> >> inlet circuit that had a very high negative temp coefficient, which
> >> was used to create a high voltage drop when it was cold, which in
> >> turn forced the first few seconds of its power draw after being
> >> turned on, thru the degaussing coils wrapped around the crt in
> >> order to demagnetise it.
> >>
> >> That voltage drop heated it, and it got hot enough to get down to
> >> just a couple of ohms, which was not enough to overcome the MOV in
> >> series with the coils.  This also allowed the tv itself to be
> >> soft-started, and it worked so well that it was often the major
> >> part failure in the tv for the first 3 or 4 years.
> >>
> >> About 3 or 4 of those, wired in parallel, would also serve as an
> >> inrush limiter when I turn on the power supply for my G0704 mill. 
> >> But the parts houses we had locally have all evaporated.  I just
> >> checked a couple surplus places without finding any of those
> >> critters.
> >>
> >> Does anyone have a suggestion as to where a small handfull of these
> >> could be sourced?  Usually bare, they look like a graphite quarter
> >> coin with a lead wire soldered to the middle of a silver plated dot
> >> in the middle of each face.  Usually slightly thicker than a
> >> 'merican quarter.
> >
> > I think you are looking for NTC (Negative Temperature Coefficient).
> > Search brings back numerous links to choose from. However, there are
> > better solutions but cost a bit more of course.
> >
> > Here is an excellent article/solution I found searching for "inrush
> > current limiter":
> > http://www.edn.com/design/analog/4316203/Simple-and-effective-inrush
> >-current-limiter-stops-surges
> >
> > Circuit is simple enough to implement it on a generic experimental
> > board.
> >
> >> When I was setting up the mill, and building that supply, I had
> >> wired up a 4 plex on the wall behind it, putting it by itself on a
> >> 20 amp breaker.  Turning it on, trips the 20 instantly as the motor
> >> supply has a huge amount of microfarads, probably in excess of
> >> 80,000 uf, mainly because that was the size of the caps I could
> >> source, NOS, locally by the fine old art of horse trading.
> >
> > One variation of the above circuit could have a resistor/relay on
> > the large capacitors side to limit the inrush current then short the
> > resistor when they are at 70%+ voltage.
>
> That's similar to the PSU I built. It uses a pull-in relay (if that's
> the right term) which only latches once the supply has come up to
> voltage. The inrush current heats a metal-cased resistor and a
> thermistor senses the heat. The resistor limits the inrush to the
> capacitor. Once it has charged, the relay latches on. It only takes a
> second, but its enough to give an effective soft-start. The PSU runs
> 79volts at 40 amps, and uses two large toroidal transformers, powering
> a pair of steppers off each.  The specs are complete overkill. The
> start-up current is only the holding torque of the size 42 steppers
> when the machine is stationary. The spindle motor is completely
> separate and has its own electronics and PSU, so that's not part of
> the equation. It only runs 2kW, so is not a problem. Soft-start there
> too, and electronic speed control, but a manufacturer-supplied control
> circuit.
>
> Marcus

I did not put any cooling fans in this one, and it also warms up in use, 
but the major heat source is those 4 toroids that make up the spindle 
supply.  Those are stacks of 2 in the pix at sublink 

"GO704-pix/inside-of-electronics-box.jpg"

So while I am at it, I'll put a line powered rotron style fan in it to 
move some air around those toroids.  The stepper drivers are arranged 
such that the stepper supply fans, when they come on, are cooled by the 
outflow from the stepper psu's. Pix of that as it was being built are on 
my web page. That night light was to serve as a bleeder when it was 
powered down, but failed I assume while I was doing some rigid tapping 
as Jon's PWN Servo amplifier is a full 4 quadrant controller, and 
recovers the energy from the motor when its doing a reversal, driving 
the normal 126 volts no load voltage up to around 150 as it does the 
slowdown phase of reversing that 1HP motor. Thats at or slightly above 
the surge voltage rating of the capacitor bank hidden under the PCB bus 
bars to the right of the toroids in the above pix.

The active link is to GO704-pix, which I thought was in my sig, but its 
under 'More recent stuff is "here"' on the front page.  Now I think I 
have the link in the sig fixed. I'll revert that in a few days.  Pix of 
that shop-made cyclone dust separator are also there.  The entry line 
going in the top, projects downward to about 3" below the sides tangent 
entry.  Even the 

Re: [Emc-users] Poor mans soft turnon

[andy pugh]

On 7 December 2015 at 12:11, Gene Heskett  wrote:
> IIRC I saw some mini-candelabra sockets at Wallies a while back
> so I need to get 2 of them and put a lamp across each half of the
> supply. Its 2 in series and 2 of those in parallel.

I wonder if it would be worth using 240V lamps, just to keep the
brightness down?

Though, in the UK, you can pretty much only get LED and CF energy
saving lamps now, which are not ideal as dummy loads :-)

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Re: [Emc-users] Poor mans soft turnon

[andy pugh]

On 7 December 2015 at 11:23, Gene Heskett  wrote:
> a third (mechanical) relay that connects a crowbar
>> resistor across the caps when the power goes off.
>
> That was the reason for the night light lamp cobbled into mine, but its
> since burned out, probably from some rigid tapping as Jon's WM servo is
> a full 4 quadrant amplifier, lighting up that lamp well past its normal
> brightness as it reverses the spindle motor.

If you are using the Pico servo amp then I guess you are running from
120V power?

My caps are charged to about 320V which makes me rather wary of them,
hence the active discharging circuit.

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Re: [Emc-users] Poor mans soft turnon

[Gene Heskett]

On Monday 07 December 2015 06:52:38 andy pugh wrote:

> On 7 December 2015 at 11:23, Gene Heskett  wrote:
> > a third (mechanical) relay that connects a crowbar
> >
> >> resistor across the caps when the power goes off.
> >
> > That was the reason for the night light lamp cobbled into mine, but
> > its since burned out, probably from some rigid tapping as Jon's WM
> > servo is a full 4 quadrant amplifier, lighting up that lamp well
> > past its normal brightness as it reverses the spindle motor.
>
> If you are using the Pico servo amp then I guess you are running from
> 120V power?
>
Yes, with a slight stepdown, so the rectified voltage is about 126 no 
load, 123 when the motor is at 2500 revs but not loaded.  And they can 
do serious damage to a screwdriver an hour after powerdown, so I 
definitely need to restore some means of bleeding them off when powered 
down.  IIRC I saw some mini-candelabra sockets at Wallies a while back 
so I need to get 2 of them and put a lamp across each half of the 
supply. Its 2 in series and 2 of those in parallel.  You can see the 
jumpers between the buss bars in the pix.

> My caps are charged to about 320V which makes me rather wary of them,
> hence the active discharging circuit.

Yes, thats not play voltage for sure.  Neither is mine, but I've been 
used for the discharge medium for higher voltages than that, several 
times.  Somehow, I'm still here.  Not my time I guess.  A good jolt and 
some burns can sure put you up for a month with shingles though.  That 
is definitely NOT on my list of fun experiences.

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Some mill pix are at:
Genes Web page 

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Re: [Emc-users] Poor mans soft turnon

[Gene Heskett]

On Monday 07 December 2015 07:19:25 andy pugh wrote:

> On 7 December 2015 at 12:11, Gene Heskett  wrote:
> > IIRC I saw some mini-candelabra sockets at Wallies a while back
> > so I need to get 2 of them and put a lamp across each half of the
> > supply. Its 2 in series and 2 of those in parallel.
>
> I wonder if it would be worth using 240V lamps, just to keep the
> brightness down?
>
240 volt lamps would be special order, probably in S-6 format on this 
side of the pond, and in my experience, not at all dependable, the very 
fine filaments are VERY easily broken by vibration even when cold. So 
thats something I'd never consider.  But a single 120 volter across each 
63 volt supply would suffice for this I believe.  And at a dull red 
glow, should last till the rapture.  We have one "nightlight" that has 2 
of those bulbs in it, in series.  They are dim, but 20 some years old. I 
use it for the off load to absorb the leakage of an X10 lamp module 
whose other load is a string of ccfl and led Christmas lights we 
rednecks never take down.  Otherwise they all flicker when they are 
supposed to be off. :(

> Though, in the UK, you can pretty much only get LED and CF energy
> saving lamps now, which are not ideal as dummy loads :-)


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)
Some mill pix are at:
Genes Web page 

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Re: [Emc-users] linuxcnc 2.7.3 - mesa 7i77 update

[Stephen Dubovsky]

Ok, updated the 7i77 per your instructions.  That seemed to work.  It got
rid of the messages when 2.7.3 starts up.  So far so good,

When I now F2 enable the machine I get a slew of "hm2/hm2_5i25.0: Smart
serial card hm2_5i25.0.7i77.0.0 error = (4) Extra character" each with a
..."error = (13) Communication error"

Looks like something is still mismatched?

FWIW, it looks like the 5i25 is ver 1.43.  Newer than it was, though not
sure if that is the latest.

Thank you,
Stephen

On Mon, Dec 7, 2015 at 12:06 AM, Stephen Dubovsky 
wrote:

> Thank you! Will try it tomorrow evening.
> On Dec 6, 2015 11:33 PM, "Marius Alksnys" 
> wrote:
>
>> Stephen,
>>
>> you should download "Version 14 serial remote I/O card firmware" from
>> www.mesanet.com, under ANYTHING I/O DAUGHTER CARDS, unzip it, and follow
>> the README file in sserial/utils/linuxcnc.
>>
>> So, you will need ssinstall script and a special script, called update7i77
>>
>> 12/07/2015 06:03 AM, Stephen Dubovsky rašė:
>> > Hello all,
>> > Upgraded the Ubuntu mill (2.5?) to 2.7.3.  Using a 5i25 & 7i77.  It
>> > complained that the 7i77 needed updating.  I found some docs on the
>> forum
>> > and updated the 5i25.  But it still complains "hm2/hm2_5i25.0: Warning:
>> > sserial remote device 7i77 channel 0 has old firmware that should be
>> > updated" (I also get a warning for ch 1.)  How do I update the 7i77
>> > firmware?  I moved the jumpers W4 & W12 (?) on the 7i77 like the
>> > instructions said to when I updated the 5i25.  Is there something else I
>> > have to run besides mesaflash?
>> >
>> > I had to rerun pncconf to regenerate the hal/ini fles. 2.7.3 crashed on
>> the
>> > old ones but the new seem fine.  I just opened the old .pncconf files
>> and
>> > right-clicked all the way to the last menu and re-saved them.
>> >
>> > Thank you,
>> > Stephen
>> >
>> --
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>> > Give your users amazing mobile app experiences with Intel(R) XDK.
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>> multiple OSs.
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>> >
>>
>>
>>
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Re: [Emc-users] Linuxcnc on Fujitsu Siemens FUTRO S400

[Paul Lacatus]

> On 7 dec. 2015, at 18:27, andy pugh  wrote:
> 
> On 7 December 2015 at 14:22, Paul Lacatus (Personal)
>  wrote:
>> Right now the computer is a tower PC with a celeron 900MHz that is bigger
>> than the MF70
> 
> 
> An alternative to this if the disparate sizes of the machine and the
> controller are a problem, might be one of the VESA mount mini-ITX
> computer cases, and a known-good mini-ITX board.
> 
> Then you can hide the PC behind the minotaur. (or, for less Classical
> danger, behind the monitor (I liked the typo)).
> 
> For even more littleness, the BeagleBone Black and Machinekit might be
> an option.
> 
> 
My first idea was to use a beaglebone black but it needs a cape to emulate the 
parallel port and also a hdmi monitor. For a try with the thin client I need 
only a 8GB CF card. I think I'll try. I think it have 512 MB ram since it was 
running XP . What version of linuxcnc is recommended ?
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Re: [Emc-users] Lathe spindle encoder drive

[Dave Caroline]

While the index will be in the same place, any tooth form error will
affect hobbing.
Must write this subject up one day.


Dave

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Re: [Emc-users] Poor mans soft turnon

[Gene Heskett]

On Monday 07 December 2015 10:53:53 Jon Elson wrote:

> On 12/07/2015 06:11 AM, Gene Heskett wrote:
> > I definitely need to restore some means of bleeding them
> > off when powered down. IIRC I saw some mini-candelabra
> > sockets at Wallies a while back so I need to get 2 of them
> > and put a lamp across each half of the supply. Its 2 in
> > series and 2 of those in parallel. You can see the jumpers
> > between the buss bars in the pix.
>
> I would just get some vitreous enamel resistors.  They are
> not that expensive, even new.  Something like a 5 W 6 K Ohm
> resistor, Digi-Key 45F6K0E is about $1.86.
>
> Jon

Well, I had this crazy thought of drilling some holes above them in the 
front cover and using them for a power on indicator.  The 
mini-candelabra sockets and the lamps would cost more than the R's, but 
there would be a certain artistic "panache" to it, reminding me it 
hasn't been powered down when I turn off the lights for the night as I 
always look back to see what else besides the computer & monitor is on.  
A mental checklist as it were.  

Busy making the breadboard end keys, which at the feed rates I can use, 
takes about 20 minutes a key, and needs my presence for a couple minutes 
as the end of each is approached to make sure the cutoffs don't get 
tangled up & wreck a key.  So thats about an hours runtime to do them 3 
up in the width of ebony I have.  And I'm digging the slots with wood 
chisels as I don't have a 1/4" slot cutter.  Or a guide and stop for it.  
I'd dig them with a router, but it would take longer to make a guide 
shoe for the router than it takes to dig them by hand.  The downside of 
course is edge damage from the chisels.  One lid has them fitted & glued 
as of lights out this evening.  I can remove it from the jig & do the 
next lid tomorrow while 6 more keys are being cut.  Need 4 more, but the 
roundover has already created one scrap to save for pen making or 
whatever.

Thanks Andy.
'
Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Some mill pix are at:
Genes Web page 

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Re: [Emc-users] Poor mans soft turnon

[Gene Heskett]

On Monday 07 December 2015 11:13:45 andy pugh wrote:

> On 7 December 2015 at 15:53, Jon Elson  wrote:
> > I would just get some vitreous enamel resistors.  They are
> > not that expensive, even new.
>
> Or higher-power lower-resistance for a faster discharge.
> http://www2.mouser.com/search/ProductDetail.aspx?R=0virtualkey0virtual
>keyTHS50560RJ
>
> As the capacitance and voltage rise you get to the point that the
> bleed-of resistor becomes an electric heater, but I think you may be
> below that point.
>
> My mill has 6600uF at 300V, and I wanted a 10 second discharge
> That means a 500R resistor,
> A 500R resistor permanently across a 300V bus dissipates 180W. And
> that's a pretty big resistor. Which is why, in my case, I decided to
> only switch-in the resistor at power-off.
>
> With less capacitance, and lower voltage, the power requirement falls
> rapidly. (with the square of V).
>
> 120V and 3300uF comes out at a far more reasonable 14W with a 1K
> resistor

I have nominally 63 volts and nearly 100k u-f to discharge.  I have a 
similar getup on the lathe at slightly lower total voltage (107) & quite 
a bit less u-f, and its about 15 minutes to screwdriver safe.  3 or 4 
minutes until the bulb is dark.

This may need the switched load if you want to work in it without going 
in and re-boreing an empty coffee cup & refilling it for a time 
killer. :)

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Some mill pix are at:
Genes Web page 

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Re: [Emc-users] Lathe spindle encoder drive

[Gene Heskett]

On Monday 07 December 2015 11:17:37 andy pugh wrote:

> On 7 December 2015 at 15:54, Sarah Armstrong
>
>  wrote:
> > how did your cad turn out
>
> https://picasaweb.google.com/lh/photo/jQREjwevQMPSQyyJspt0wtMTjNZETYmy
>PJy0liipFm0?feat=directlink

Nice!

Cheers, Gene Heskett
-- 
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Some mill pix are at:
Genes Web page 

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[Emc-users] My Holbrook conversion

[andy pugh]

Nothing to do with CNC, but looking inside a rather well-made lathe
http://bodgesoc.blogspot.co.uk/2015/12/holbrook2.html

Then some CAD design and pattern-making for new parts
http://bodgesoc.blogspot.co.uk/2015/12/Holbrook3.html

And the LinuxCNC part,
http://bodgesoc.blogspot.co.uk/2015/12/a-start-on-controller.html

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Re: [Emc-users] Hardinge Conquest 42 Conversion

[Jeremy Jones]

Thanks everyone. Sarah, thanks for that great link. Not sure how I haven't
come across that yet. I'm gonna look into everything. Thinking I might just
got this route off the bat. Looking it might be a minimum of $1500 to fix
the controls. I think the LCNC electronics will be cheaper..I hope. Want to
get it up and running rather quickly as this will be put into service right
away.

Anyone know the possibilty of switching one of these over to single phase
during the conversion? I'm guessing the spindle drive is 3 phase. Would
need to see it to know for sure. Don't have it in hand yet.

On Mon, Dec 7, 2015 at 8:35 AM, andy pugh  wrote:

> On 7 December 2015 at 13:19, Stuart Stevenson  wrote:
> >
> > The harder and correct answer is 'not until you make it do it'.
>
> Having said that, the sequence required for a lathe is rather simpler
> than for a milling machine.
>
> The "carousel" HAL component can do a lot of the work:
> http://linuxcnc.org/docs/2.7/html/man/man9/carousel.9.html
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
> --
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