Re: [Emc-users] Reading config values with a realtime HAL module.

[Dave Caroline]

For probe compensation batch reading would be far more useful than compiled in,
then it becomes simple to read the compensation file for any stylus
you change too.

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Re: [Emc-users] Rough motion with servos

[Dave Caroline]

"The computer I am using is showing it's age and the ancient version
of Debian I have been running won't even boot properly on my new
computer." implies some change to us, what?, changing OS will change
the latency too


Dave

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Re: [Emc-users] Rough motion with servos

[Dave Caroline]

New PC new possible latency problems?

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Re: [Emc-users] LCNC TED Talk style

[Dave Caroline]

oops missed a link

http://www.archivist.info/cnc/wormtest/

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Re: [Emc-users] LCNC TED Talk style

[Dave Caroline]

There are some odd uses that dont lend themselves to video
I have used Linuxcnc for Worm division accuracy testing
http://www.collection.archivist.info/searchv13.php?searchstr=pd+wormtest

another used it for antenna measuring
http://emcar.sourceforge.net/

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Re: [Emc-users] Question on thread geometry

[Dave Caroline]

As that one has a range then you turn to final diameter ans dont go
too deep with the insert, that leaves a flat on top.
Measure on the job with thread wires etc to check depth.


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Re: [Emc-users] Slide covers

[Dave Caroline]

There are two folds used in bellows both should be easy to find
a google images search for
bellows fold pattern

Dave Caroline

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Re: [Emc-users] Timing Belt?

[Dave Caroline]

Better off with helical or bevel gears for 90 degrees I think.
Else you will have to space widely and go over shaped rollers so it
arrives at the pulleys square and hope it does not wear too fast. flat
belts used some crafty alignment and crowned pulleys for this.

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Re: [Emc-users] OT: analog to step/dir

[Dave Caroline]

You could get an analogue in connected to stepgen.N.position-cmd to do this
with any scaling needed. What is the use case?

Dave Caroline

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Re: [Emc-users] 3D Printers

[Dave Caroline]

Traditional pattern making was 3d built up, did not need subtractive
milling or 3d plastic printer

:)

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Re: [Emc-users] More Renishaw questions

[Dave Caroline]

I have tried a SFH213 Photodiode with a comparator but it is a bit
fiddly and not that sensitive, will try a QSE159 when it arrives.

Dave Caroline

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Re: [Emc-users] More Renishaw questions

[Dave Caroline]

Ken I have a LT02 and that is switched on by a just about any infrared
pulse waveform and the return appears to be 115k baud optical, I am
building my own OMM with an arduino MI as soon as I get around to it,
had to get a fast opto diode an opto transistor I first obtained was
deaf and too slow (less than an inch to get a signal)

Results will be on the web soon.

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Re: [Emc-users] Thing with a square hole.

[Dave Caroline]

you dont need space for an edm machine the fella down the road
probably accepts folding paper, price depends on qty, I get taps burnt
out for a tenner

Dave

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Re: [Emc-users] Thing with a square hole.

[Dave Caroline]

probably easiest to EDM the square

Dave Caroline

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Re: [Emc-users] OT: What Is It?

[Dave Caroline]

Classic metal transfer due to the arc

Dave Caroline

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Re: [Emc-users] g-code database

[Dave Caroline]

I have started to do a mysql version
output at
http://www.archivist.info/cnc/gcode/

changes, added parameters, added an ID, fixed a few things, added some
missing codes

and not finished...
there is a link to the .sql at the bottom of the page

Dave Caroline

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Re: [Emc-users] g-code database

[Dave Caroline]

It perhaps would be useful as a .sql file so it can be placed in a
mysql/web database

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Re: [Emc-users] Swiss Type Lathe-Turn Machine

[Dave Caroline]

If you look at an old swiss cam auto then the concept of interleaved
moves was exactly how they optimised the speed of the cycle.

On my Bechler the tooling is on separate slides with accessory live
axes opposite the spindle.

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Re: [Emc-users] Swiss Type Lathe-Turn Machine

[Dave Caroline]

Horribly broken web page javascript I see a blank white page

Dave Caroline

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Re: [Emc-users] An observation on digital calipers

[Dave Caroline]

I have a real Mitutoyo and have had intermittent problems recently, it
turned out to be the lower battery contact has a small crater with the
under lying corrosion pushing upwards stopping proper contact
(probably from a leaky battery at some time), a rejig of the spring
contact has fixed it.

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Re: [Emc-users] Haas thoughts

[Dave Caroline]

That is very out of date, LinuxCNC having branching etc in the gcode
as well as rigid tapping, read the docs for real info not random
websites

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Re: [Emc-users] CNC little hobber

[Dave Caroline]

The differential gears are nothing to do with prime but to add the
traverse into the equation and also to add a rotation for a helical.
I have a diagram of one at
http://www.collection.archivist.info/hobbing.html

then you can wind the hob back along its cut traverse and it remains "in gear"

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Re: [Emc-users] CNC little hobber

[Dave Caroline]

And I used Andy's info and cnc'd a Barber Colman hobbing machine

http://www.collection.archivist.info/searchv13.php?searchstr=barber+colman+pd

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Re: [Emc-users] Best way to jog all three axis using a single push button?

[Dave Caroline]

Maybe some kins so it is a real vector (I think that is what another
art installation did)

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Re: [Emc-users] Rotary table indexer project

[Dave Caroline]

Too me this is nuts, just use linucnc to index, no need for add on
code and hardware, goes both ways, coordinated moves (hobbing, helical
cuts and radii), indexing is trivial in an Ocode routine.
When I first set up my machine it was for cutting gears, using
linuxcnc got rid of all the errors of the manual methods we were using
in the clockworks. I started with only 2 axes under cnc the rest
manual (rotary and cutter pass)

Dave Caroline

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Re: [Emc-users] xl pulleys

[Dave Caroline]

HPC gears in the UK make pulleys in the same way as I do and list the
intermediate stage in their catalogue, see
http://www.hpcgears.com/n/products/15.toothed_bar_stock/toothed_bar_stock.php

or make a hub assembly and press fit any gear on


Dave Caroline

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Re: [Emc-users] Need unlocked copy of a pdf for a breakout board I just bought two of.

[Dave Caroline]

That looks like a board I would not recommend look close to the white
sockets near the axis outputs, it has series resistors for the driver
optos, these of course are in the driver as well, this means half
current through the opto and failure to work.

I was working with a free issue board where I met that problem before

Dave Caroline

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Re: [Emc-users] Nice old iron

[Dave Caroline]

Marcus often internal slides and even external if a good metal will
not have lost enough in rusting to make them unusable and any original
oil can keep most in reasonable condition for a number of years. When
you clean the surface rust with a scraper (not too sharp) and or wire
brush you can still see machining marks.

My southbend came rather black from a paint shop but any rust I had to
clean off is small fry compared to the wear on the slide from its
production days.
I have cleaned and painted a few parts over the years, still scruffy though
http://www.collection.archivist.info/searchv13.php?searchstr=southbend+pd

in my hobbing machine, was a bit of a fight to free and take apart
http://www.collection.archivist.info/searchv13.php?searchstr=barber+colman+pd
I had some water into the slide, mostly ok, just needed a clean with a
scraper and fine (1200 grit) wet and dry to clean up. sorry no picture
of that area after cleaning.

Dave Caroline

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Re: [Emc-users] Nice old iron

[Dave Caroline]

Do not let "stored outside" frighten you
in my garden for many years to restored and running
http://www.collection.archivist.info/searchv13.php?searchstr=filing+new
about a week of restoration
and another that was usable after a day or two
http://www.collection.archivist.info/searchv13.php?searchstr=harrison+pd
I got that rusty anyway then stored the base outdoors

No before pictures but this was found outdoors in a puddle at a scrapyard
http://www.collection.archivist.info/searchv13.php?searchstr=dumore
after cleaning de rusting and tested, not been painted.

Dave Caroline

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Re: [Emc-users] snagged touch probe on eBay - anybody know how to interface ?

[Dave Caroline]

I have an LT02 with LP2 probe that I need the protocol to switch it on
although for a backup I got a standard socket (FC3 iirc) that the LP2
can fit in so normal wired connection can be used

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Re: [Emc-users] snagged touch probe on eBay - anybody know how to interface ?

[Dave Caroline]

I have a Valeron probe that also had an infra red transmission, was
too lazy to reverse engineer and just cleaned the contacts and wired
direct, some probes have adjustable force, some are set to a high
force mine was mounted on CAT50 so is a brute.

http://www.collection.archivist.info/searchv13.php?searchstr=valeron

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Re: [Emc-users] Machine measurement

[Dave Caroline]

I get around this sort of problem with various forms of travelling microscope

http://www.collection.archivist.info/searchv13.php?searchstr=travelling+pd
to measure an axis travel I used an accurate DTI in one plane
http://www.archivist.info/cnc/screw_error/

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Re: [Emc-users] Need some advice on where to buy shim stock in custom widths

[Dave Caroline]

I get rid of the curled/rough edge by a bit of grinding/filing and
also I roll it with a ball bearing on a bit of ground flat steel with
a finger through the bearing pressing down.

Sharp scissors or best tins nips

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Re: [Emc-users] Multi-spindle machines

[Dave Caroline]

Polygon turning https://www.youtube.com/watch?v=KMdBIBzGtKI
multi spindle cnc https://www.youtube.com/watch?v=97JZX1JkYQk

sliding head with a back spindle
https://www.youtube.com/watch?v=TkYNLlk6EE0
and for the greedy multi spindle milling
https://www.youtube.com/watch?v=_IYFMfM7dYk

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Re: [Emc-users] Attachments/Pictures with Mailing List Posts?

[Dave Caroline]

I am on gmail and did see the pic

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Re: [Emc-users] linuxcnc and raspberry pi3

[Dave Caroline]

They did not say no, were not saying no, were not implying no,
You misunderstood, jepler was merely asking for a pull request to make
the review process easy.

He wants to help.

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Re: [Emc-users] Tool Marks?

[Dave Caroline]

I a picture of the machine and setup could have helped, it could be
vibration of tool, machine or work.
You also did not mention the material, Some materials have grain due
to how they are made.

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Re: [Emc-users] OT: lapping machine disc

[Dave Caroline]

Interesting that someone else is looking at this subject. A few days
ago I dug out an old machine I rescued from factory about to be
redeveloped, it has no grooves and also rotation is from above if
wanted.
http://www.collection.archivist.info/searchv13.php?searchstr=cooke+polishing

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Re: [Emc-users] Lathe limit puzzle

[Dave Caroline]

It mostly gets in the way so is usually off the bed.

Dave

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Re: [Emc-users] Lathe limit puzzle

[Dave Caroline]

The denford starturn has the switch on the saddle and a sliding member
gripping the bed just visible under the chuck to the rear
http://www.collection.archivist.info/archive/DJCPD/PD/2009/2009_09_10_Starturn_cnc_lathe/P1010045.JPG
So you can put it where you need for a setup

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Re: [Emc-users] Timing belt size?

[Dave Caroline]

Also please be aware of
http://www.micromo.com/microstepping-myths-and-realities

a consistent amount of movement from a microstep is not going to happen

Dave Caroline

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Re: [Emc-users] Lubrication

[Dave Caroline]

I should have mentioned the beam axle was installed in 1849, not sure
if the bearing bronzes have ever been replaced on the beam axle. In my
time (about 15 years) I have only machined one half bearing on a pump
rod that had dirt blocking the oilway, we cleaned the journal surface
with wet and dry about 800 grit and reassembled, no problem since.

it is the regular oiling and keeping dirt out that keeps old stuff running.

http://www.middleton-leawood.org.uk/leawood/photos.html

Dave Caroline

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Re: [Emc-users] Lubrication

[Dave Caroline]

We have the similar sort of problem with the axles on a beam engine,
they are plain bronze and only rock with 30 tons of rocking weight. we
actually use a steam cylinder oil for our bearings. It is a type of
oil like the slideway oil that really sticks to the surface and takes
little movement to lift the two surfaces apart on a film of lubricant.

Dave Caroline

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Re: [Emc-users] Lubrication

[Dave Caroline]

And a reading list if you have a good local library
http://www.collection.archivist.info/searchv13.php?searchstr=621.822

Dave Caroline

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Re: [Emc-users] Lubrication

[Dave Caroline]

This is a deep subject named tribology. some lubricant makers also
provide recommendations.
see refs at bottom
https://en.wikipedia.org/wiki/Tribology

Dave Caroline

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Re: [Emc-users] Controller/machine resolution

[Dave Caroline]

we are all saying it makes NO difference how many trailing 0s you have
the accuracy is machine and its maths, see Andy's answer

Dave Caroline

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Re: [Emc-users] Controller/machine resolution

[Dave Caroline]

A number is a number regardless of trailing 0's, no affect on accuracy
or resolution.
Where users do get it wrong though, is not understanding how path
following has a tolerance. This is separate from the number and its
0's but the speed of how you can change direction.
see http://wiki.linuxcnc.org/cgi-bin/wiki.pl?TrajectoryControl
and
http://linuxcnc.org/docs/2.6/html/gcode/gcode.html#sec:G64

Dave Caroline

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[Emc-users] A whatsit probe

[Dave Caroline]

Last year while looking and researching into CMM probes I came across
an interesting probe that was not that well described.
picture :-
http://www.collection.archivist.info/archive/mirror/probe/scanning_probe.JPG
Internals
http://www.collection.archivist.info/searchv13.php?searchv4page=1=lvdt+probe

it has flat spring hinges and LVDT sensors and measures the
deflection, no contacts
the springs have dampening foam stuck to them

Ebay seller had it as Renishaw/Zeiss

Separately I got some stylii for it
http://www.collection.archivist.info/searchv13.php?searchstr=stylus+probe

the extensions to the right are correct for this probe

No makers name or model on the outside
numbers inside 1444   0,25

It has limit switches if deflected too far.

I wonder if anyone know the actual maker and model so I can hunt a bit
more for information

Dave Caroline

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Re: [Emc-users] Gib screw direction

[Dave Caroline]

Actually tapered gibs are a pain if they dont have a screw both ends,
Those with a single screw are in a slot so they can resist the gibs
tendency to self tighten and for removal of the gib. Broken or bent
gib screws seem to be a regular problem with taper gibs.

Dave Caroline

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Re: [Emc-users] Micro-switch repeatability

[Dave Caroline]

I originally searched for a switch with data and a local distributor
had some movement specs of the plunger, I got some but unfortunately
that distributor no longer lists the item. but it is a Patterson V4
type microswitch, the .tw website of theirs is not easy to read
though. One day I might fit them

Dave Caroline

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Re: [Emc-users] Creating G-code?

[Dave Caroline]

I used to create my gears with a bit of php but then is became obvious
that the same maths could be done in gcode, one less step, so the
preamble in the gcode has a tooth qty/whatever is needed for that
class of work.

Dave Caroline

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Re: [Emc-users] Question about closed loop CNC

[Dave Caroline]

Just needs the loop closing and a sensible driver I think. eg :-

http://www.galil.com/news/servotrends/closed-loop-stepper-motor-performance-gains?utm_medium=email_campaign=01-16%20ServoTrends_content=01-16%20ServoTrends+CID_99eb132dcec7ff54cbcbb34e1ca392e5_source=Campaign%20Monitor_term=Read%20More#overlay-context=news/servotrends/new-ethercat-io-controller/

Dave Caroline

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Re: [Emc-users] VFD Tweaking

[Dave Caroline]

What I did was reduce the maximum acceleration so the motor took less
current coming up to speed.


Dave Caroline

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Re: [Emc-users] Resetting rotary movement count

[Dave Caroline]

Here is an example of with and without limits in a trunnion design
http://www.ebay.co.uk/itm/CNC-Rotary-Table-Dividing-Head-Rotational-Axis-4th-5th-Axis-A-B-Axis-100MM-Chuck-/161679996211

Dave

On 05/01/2016, andy pugh  wrote:
> On 5 January 2016 at 04:37, Cecil Thomas  wrote:
>> By the way if there have been any changes in LCNC that let you "home"
>> or set the rotary axis back to zero without exiting the program or
>> actually running the axis back to zero I'd like to know about it
>> since I haven't looked into it for over 10 years.
>
> Re-homing the rotary would reset the absolute position.
> There are HAL pins to home each axis. (halui.joint.N.home bit in)
> You can drive a bit pin from G-code.
> So I think it could be done, but it seems like a kludge.
>
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Re: [Emc-users] Resetting rotary movement count

[Dave Caroline]

Dewey I had no idea that size limit existed, same default for negative?

Maybe time for an update to the docs? even removal of the standard
 from stepconf (or at least ask the user)

Dave

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Re: [Emc-users] Resetting rotary movement count

[Dave Caroline]

I had problems in this area, I think it is not a feature but a bug
that an rotary axis cannot be set to 0 or be infinite in its
rotations, the wrapped rotary docs as an option just seemed wrong for
this when I last read them a few years ago.
Winding back is a very slow operation and should not be needed.

There are rotaries with mechanical limits and rotaries without limits,
an arbitrary large number used as a limit is a kludge waiting to bite
the unsuspecting.

Dave Caroline

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Re: [Emc-users] Lost fractions of a step

[Dave Caroline]

I forgot to mention, I had no accumulated step loss in my tests, I
started each test with encoders at 0 and they completed with 48000 and
2, not even a +-1 digit error which surprised me.

Dave Caroline

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Re: [Emc-users] Lost fractions of a step

[Dave Caroline]

In my experience of watch and clock gear cutting, heating is almost
non existent as an error source, for steel one cuts under a lubricant
which cools and brass is cut dry with a sharp cutter and often the
clamping washers if used will keep it cool. Only one "brass" wheel
gave me a problem and that was in naval brass for a tower clock, it is
closer to a bronze.

Dave Caroline

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Re: [Emc-users] Lost fractions of a step

[Dave Caroline]

And another thing, almost all rotaries have backlash, do make sure
this is removed in gcode before you start cutting this will result in
a single tooth error.

Dave Caroline

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Re: [Emc-users] Lost fractions of a step

[Dave Caroline]

The internal numbers in gcode are floats there is no rounding down
unless you put small constants in your gcode, I calculate the tooth
angle in gcode so internally it is as accurate as needed.

eg do not calculate yourself use a line such as
#=[360/#]


I never see your problem and have been using linuxcnc since 2.2.
I would see a problem if I did not nod the a axis to remove the backlash.


Dave Caroline

On 03/01/2016, Cecil Thomas <wctho...@chartertn.net> wrote:
> I guess I wasn't as clear as I had hoped about my question.
> To be more specific:
> When the commanded value for a move is converted into steps (or
> microsteps) and that number of steps contains a fractionWhat
> happens to the fractional part of a step
>
> I am not speaking of dropped steps as would be the case in a stepper
> whose movement is inhibited by not being able to complete a step due
> to load, velocity, acceleration, setup or duration.
> I am only questioning whether LinuxCNC drops the non integer portion
> of a step when converting from commanded position change to steps.
>
> I have assumed that the system can only issue steps as an integer and
> that the fraction is dropped.  If this is the case then the system
> can ONLY "round down" so all commanded moves that don't convert to
> integers wind up being short of the desired move.  Never "long".  The
> only way the error can "even out" is by virtue of having the effect
> balanced by equally "short" moves in the opposite direction.
>
> As I have designed my program there are many more moves in one
> direction than in the other so I assume that the "shortness"
> accumulates over a large number of moves.  My calculations for the
> accumulation of error in my system seem to match the measured
> results.  I can change my program to  try to balance the forward and
> back moves or I can add a stage of reduction to the A axis to reduce
> the magnitude of the "leftovers" or both but before I proceed I would
> like to be sure that the trajectory planner does as I assumed "Only
> round down".
>
>
> Cecil
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Re: [Emc-users] Lost fractions of a step - Clock Wheels and Pinions

[Dave Caroline]

The book which has a selection of standards is Gears for small
mechanisms by W.O. Davis, it was reprinted by TEE publishing ISBN
1857610156
Note the correct form has a rectangular root which stops the end mill kludge.
We just used the Thornton cutters to get it right.

The cycloidal form has a number of "standards"  swiss,black forest and
the british one based on the swiss.

http://www.clock-works.clara.net/cata/wnpc3.html

Dave Caroline

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Re: [Emc-users] Lost fractions of a step

[Dave Caroline]

Microstepping increases resolution but not accuracy, you can easily
lose torque in intermediate positions, any stiffness in the rotary
will just add error.
Perhaps the worst thing I have seen though is rotary error itself, the
lower the reduction ratio usually means a greater error from the
worm/wheel in the rotary. Here you see tooth width error at worm wheel
tooth rate.

I was working at a clockmakers and I had some high count wheels
rejected. This made me measure all the rotaries we had plus a gear set
I had ready for the George Thomas design and a rotary we borrowed,
only one a 1940's Boley was within any kind of spec. On this we made
new dividing disks and cured our quality problem.

As it happens my xmas project is to start to document the errors in
this typical setup as used by many.
http://www.archivist.info/cnc/wormtest/
The page is not yet finished I need to finish the tooth error average
for the 48 tooth gear and the high resolution microstepping error,
which currently shows as regular noise on the upper graphs.

Dave Caroline

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Re: [Emc-users] Spindle control

[Dave Caroline]

motion.spindle-at-speed IN BIT
the IN states it is an input so you already found it.
that pin being in the pins section of
http://linuxcnc.org/docs/html/man/man9/motion.9.html

Dave Caroline

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Re: [Emc-users] Grounding Issues

[Dave Caroline]

It might help to draw a diagram showing the electronics (drives
modules etc) and where they are grounded showing outlines of the
cases.

This is to get an idea where any common mode interference signals can come from.

Also pictures of the wiring with annotation of wire bundles to get an
idea of any capacitive or inductive coupling.

Dave Caroline

On 20/12/2015, John Thornton <j...@gnipsel.com> wrote:
> I have a BP knee mill with an Anilam 1100M CNC kit on it. I've removed
> all the Anilam controls a while back. I've retained the drives and power
> supply and added a GS2 VFD for the spindle. I have a 5i25 7i77 setup.
>  From the get go I've had problems with the electronics on this machine.
> The VFD is controlled by modbus via the gs2 component. The VFD gets
> reset to default parameters all the time from noise on the modbus. the
> 5i25 get sserial errors. The sserial errors are so bad now it won't even
> move an axis. The spindle works ok. The power supply is a simple bridge
> rectifier with a huge blue cap and a large power resistor across the cap.
>
> Peter keeps telling me it's a grounding issue so where do I start
> looking and what do I need to do?
>
> Thanks
> JT
>
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Re: [Emc-users] Grounding Issues

[Dave Caroline]

The din rail in the 05 pic is that real tight to the back panel (add
star washers to cut through paint), make sure the green/yellow blocks
have the middle screw tight.

One mighty thin grounding wire in bpel04.jpg, also could add star
washer to cut through paint

You could measure the ground resistance too if you can.

Others are likely to mention you have two grounds rather than a star
ground. Make sure cases are tight to frame to guarantee continuity

Dave Caroline

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Re: [Emc-users] Probe

[Dave Caroline]

On a cmm the probe can be calibrated around a reference ball in
multiple directions to get the effective diameter of the stylus ball,
this should be done whenever the stylus is changed.

This can also calibrate out the variation in different directions
caused by the variation in contact force needed to break the contact,
some probes have a contact force adjustment at the rear which forces
the stylus downwards, while lightening the force reduces stylus
bending it also makes the electrical contact less good so is a
compromise.

More modern probes use a force sensor to get around the kinematic
design problem.

Dave Caroline

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Re: [Emc-users] Lathe spindle encoder drive

[Dave Caroline]

Hobs can be ground to generate cycloidal teeth as well as involute,
the key word here is "generate" which is the process of making the
required curve.

Dave Caroline

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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

[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] Lathe saddle protection

[Dave Caroline]

I have the mechanical version on one of the lathes too, it is job
specific I dont see how a proximity switch could know all possible
errors of eg hitting jaws, chuck body or work or even the headstock.
The little denford cnc lathe has the electrical stop movable on the
bed.

Dave

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Re: [Emc-users] machine motion

[Dave Caroline]

I have seen this on my machine which still has 2.4 on, it is on a
machine with not enough ram. I make sure unwanted background stuff is
not running to avoid it.

Dave

On 29/10/2015, Stuart Stevenson  wrote:
> Gentlemen,
>   re: the cinci at MPM
> When they push the arrow key to move an axis the machine keeps moving. A
> couple weeks ago the X axis was the only one doing this but now other axes
> demonstrate this feature.
> They disconnect the keyboard, use the mouse to move the axes with using the
> +/- buttons and get the same result.
> What should the next focus be to troubleshoot this?
>
> Ubuntu 8.04
> LinuxCNC 2.4.?
> Axis Display
>
> I know, I know - it needs upgraded. Not possible at this time.
>
> thanks
> Stuart
>
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Re: [Emc-users] Spiral spring covers

[Dave Caroline]

These are not much more than a version of a plain clock spring. I
imagine a bit of modification to a large clock spring or get a spring
from one of the pull out barriers used in public areas trade name was
tensator iirc

Dave

On 27/10/2015, andy pugh  wrote:
> Does anyone know a cost-effective source of spiral spring covers?
>
> I have just been quoted £125 each for a pair of spiral spring
> leadscrew covers for my lathe (£318 delivered in VAT) by Beakbane. DQR
> didn't even bother to reply.
> Given that the ballscrew + double ballnut came in at £170 this seems
> somewhat excessive. Does anyone know where I can find some that I am
> prepared to afford?
>
> --
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> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
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Re: [Emc-users] Spiral spring covers

[Dave Caroline]

the tensator style are also used as constant force for tool balance
purposes and can be almost any size to suit.

Dave

On 27/10/2015, andy pugh <bodge...@gmail.com> wrote:
> On 27 October 2015 at 15:35, Dave Caroline <dave.thearchiv...@gmail.com>
> wrote:
>> These are not much more than a version of a plain clock spring. I
>> imagine a bit of modification to a large clock spring
>
> I am rather committed to one that is 50mm wide, which would be quite a
> big clock spring.
>
>>  or get a spring
>> from one of the pull out barriers used in public areas trade name was
>> tensator iirc
>
> I imagine that those are quite small, seat-belt sized at a guess.
>
> I rang DQR who import theirs from Germany, and the price came in as
> £41 each. Quite a difference.
>
> --
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> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
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Re: [Emc-users] Cylindrical grinder Jones and Shipman

[Dave Caroline]

 A good make from near me (30 miles ish,) I imagine a cnced version
would be useful

Dave

On 06/10/2015, Marshland Engineering  wrote:
> I've just purchased an old but good Jones and Shipman grinder. While
> stripping
> it all for sand blasting and repainting, it looks like a great candidate
> for
> CNCing. CNC the headstock rotation and the grinder forward/backward travel.
>
>
> See here (Not mine)
>
> http://www.excellmachine.com/products/cylindrical-grinders/
>
> The headstock only needs to turn at maybe 10 RPM, so a 300 - 500 watt motor
> should do the job, as the grinder only takes very small cuts in the part.
> The
> main grinding head (80KG or so) will need a bit more.
>
> I can still use the automatic table travel and use a micro switch to
> increment
> the grinder travel for longer parts.
>
> I would like to eventually grind engine camshafts and I think this will do
> the
> job.
>
> Any comments ?
>
> Cheers Wallace
>
>
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Re: [Emc-users] multiple gcode streams in parallel

[Dave Caroline]

Actually this problem touches the independent axes problem that I
foresee in my sliding head lathe where an axis that will be cutting
later needs to start part way though another's coordinated move in
order to save time.

Dave Caroline

On 24/09/2015, andy pugh <bodge...@gmail.com> wrote:
> On 24 September 2015 at 02:18, Jerry Scharf <jsch...@finsix.com> wrote:
>> I now need to extend it to run two separate robots off the same linuxcnc
>> controller and receiver program
>
> If you need the robots to synch then I think you need to be a bit cleverer.
>
> If you imagine one robot moving in XYZ space and another moving in UVW
> space I think you need a pre-processor that "interleaves" the G-code.
> This will include breaking up an XYZ move to start a UVW move and
> vice-versa.
>
> All the axes of a G-code line reach the end point at the same time. So
> to coordinate two robots you need to combine the moves onto one line,
> otherwise you can't have both moving.
>
> --
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Re: [Emc-users] multiple gcode streams in parallel

[Dave Caroline]

might be better to let the two talk to each other in some way so move
starts/runs are really synchronised properly rather than rely on
buffers.
eg classic ladder or some clocking or whatever

Dave Caroline

On 24/09/2015, Jerry Scharf <jsch...@finsix.com> wrote:
> Hi,
>
> I have hacked up a simple program to allow a client to connect up to the
> linuxcnc system and issue g code commands. It's fairly stupid, just enough
> to get what we needed done.
>
> I now need to extend it to run two separate robots off the same linuxcnc
> controller and receiver program. This brought up a question about the
> python interface.
>
> Can I issue two separate motion commands for different axes at the same
> time? One bot is a single axis on b and the other uses a,x,y,z. The motion
> for each is serialized by the nature of the network buffers, but I am
> trying to understand whether I need to serialize the commands between the
> different streams. It seems right now like if I move the machine manually
> from the GUI, the program then thinks the controller is not ready to accept
> mdi commands.
>
> I have an allocation command that is being extended to have you tell it
> which axes this client wants to move. This prevents two programs from
> fighting over a given stepper...
>
> It's really minimal code but I will share it if people are interested.
>
> jerry
>
> --
> Jerry Scharf
> FINsix IT
> 650.285.6361 w
> 650.279.7017 m
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Re: [Emc-users] BeagleBone and LinuxCNC for a lathe.

[Dave Caroline]

Why stepper ? gearing up the speed with a pulley even less sense, they
lose so much torque at a sensible lathe spindle speed that I cannot
understand the reasoning for going down the wrong rabbit hole.

Just think what would happen if your chatter frequency was anywhere
near the stepper resonance too.

I do use small lathes (watch (DC) and clockmaker (AC induction motor)
sizes) and need to get the RPM up a lot for small stuff.


Dave Caroline

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Re: [Emc-users] Min spindle encoder resolution for mill rigid tapping?

[Dave Caroline]

There is no such thing as instantly there is a delay until an edge
is detected, a delay before the software has looked at the current
position and direction and a delay before Z starts to follow the
reversal, the sum of delays is a strain on the tap, making all numbers
less will reduce the strain.

I have made a 50 slot wheel for my 5 axis in readiness to try rigid tapping.

200 counts per rev, Z screw is 1mm per rev, that is about .2 thou from
the encoding and more for any software delay to Z command.

Someone with a .2 pitch screw and 8 slots has a possible error of
6.25 thou before seeing the encoder edge. not something I would try.

Dave Caroline

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Re: [Emc-users] Min spindle encoder resolution for mill rigid tapping?

[Dave Caroline]

It also depends on minimum tap size, a tiny tap will be less able to
stand any vertical strain due to encoder resolution in thou per
encoder edge and there has to be an amount due to the turn around of
up to something (a count) plus any delay in the software and servo
driver lags (ferror)

Rather machine dependent(and its settings) and I doubt anyone can
write a general specification.

I wonder if the tap makers have any numbers for machine taps.

Dave Caroline

On 11/08/2015, Jon Elson el...@pico-systems.com wrote:
 On 08/10/2015 06:38 PM, David Bagby wrote:
 Hi,
 I'm planning a mill conversion to LCNC and I'd like it to be able to do
 rigid tapping.

 I figure that this will require an encoder or equivalent) on the
 spindle. I won't be able to to easily attach a common encoder disc to
 the spindle, so I will probably have to create an encoder (which appears
 easier than doing a remote encoder driven via a belt etc).

 I've looked but not found a spec for the required encoder resolution.
 Does anyone have advice as to min spindle encoder resolution (ppr)
 required?
 Has anyone gotten by with 8 or 12 pulses (32 or 48 quadrature) ?


 I've been doing it using the 81 tooth bull gear on my
 Bridgeport 1J head, and that works fine.  That comes out to
 324 quadrature counts/rev.  I'd guess that your counts will
 likely work OK, too. You can figure out the steps/second the
 encoder value will show. For instance, at 100 RPM, the
 spindle will be turning 1.667 RPS, and 32 counts/rev will
 give 32 * 1.667 = 53.33 increments/second to the encoder
 value. Most machine controls don't have the bandwidth to
 keep up with that, and will just average over it.

 The worst situation would be that this would feed a
 stairstep position to the PID (assuming a servo Z axis) and
 that the PID + drive combination would have some resonance
 at certain frequencies that could be excited by the stairstep.

 Jon

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Re: [Emc-users] Gear Hobber

[Dave Caroline]

and feed the hob once every revolution of the work. 
That is geared as well it is a continuous function

For adjusting the twist, I was figuring on accurately placing two
drill bushings that would hold two dowel pins against which I would
place my sine bar, and just use a set of gage blocks to get the angle
right.
a rotary axis,
but this does not have to be as accurate as one first thinks, on my
hobbing machine and the one I used to use it is just lines marked on
the head and vernier lines on the body to clamp up the angle. On the
Mikron you could only estimate to about half a degree iirc.
On the Barber Colman, see the ball handle upper middle to the rear of the head
http://www.collection.archivist.info/archive/DJCPD/PD/2014/2014_09_17_Barber_Colman_cnc/IMG_1830.JPG
That has a vernier marked to allow estimation to 5 minutes.

Dave Caroline

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Re: [Emc-users] Gear hobbing machine

[Dave Caroline]

squiffy One also needs to take into account the face width of the
cutter so it is not always possible to do that.

Also while dreaming of applications and methods, worm wheels need a
plunge rather than go across the face, one could also use a special
path to match a prospective worm with the curve/wrap of the worm wheel
around the worm.

You also need some crazy wide cutter to hob the worm itself

Dave

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Re: [Emc-users] Gear hobbing machine

[Dave Caroline]

John that same counting cleverness needs to be in or merged with the
differential
for helical gears to allow it all to remain in gear and have a fine
feed and to move the cutter head back to be able to measure and take
another shaving.

http://www.collection.archivist.info/hobbing.html

having used the hal method
I did get a slight error
http://www.collection.archivist.info/searchv13.php?searchstr=speedo
pics at bottom show a slight helix
I did add encoders to the machine to see if there was any slip/step
loss/other bugs but did not find the error, being small when sliced
into gears it remains as a feature.

Dave Caroline

On 30/07/2015, John Kasunich jmkasun...@fastmail.fm wrote:


 On Wed, Jul 29, 2015, at 09:35 PM, richsh...@comcast.net wrote:
 I am adapting a version of the little hobber and want to use linux-CNC
 to do the ratio division between the hob and the work spindles.
 Additionally, a third axis that is actually the feed needs to be
 incorporated. Any thoughts.

 The encoder-ratio HAL component was invented with this specific use in
 mind.
 http://linuxcnc.org/docs/html/man/man9/encoder_ratio.9.html

 It is a software based encoder counter (like the regular software encoder
 counter), but it does the math differently to avoid some problems that can
 happen if you use a more normal approach.

 The normal approach would be to use either software or hardware encoder
 counters to measure the position of each axis, then scale the positions
 based on the tooth ratios, and eventually compare them to determine how to
 drive the slave axis.  The problem is that if you run long enough you start
 running out of accuracy.  Imagine that your hobber has been running for
 hours.  You might find yourself subtracting 100,000,000.03 revolutions of
 the master from 100,000,000.05 revolutions of the slave.  If the math
 doesn't have enough significant digits, the 0.02 revolution difference gets
 lost in the noise.

 The encoder ratio component uses a different approach to the math, and will
 never run out of accuracy no matter how long it goes.

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

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Re: [Emc-users] Gear hobbing machine

[Dave Caroline]

Andy has implemented it on a mill
http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Hobbing

And I used the ideas from that page and did a stepper version on an
old mill for someone and also an old hobbing machine made by Barber
Colman

http://www.collection.archivist.info/searchv13.php?searchstr=barber+colman
and http://www.archivist.info/cnc/hob2/

there are some more thoughts I wrote up some years ago
http://www.collection.archivist.info/hobbing.html

in that diagram there is a differential, a hal comp has recently been
implemented so that is now possible

Dave Caroline

On 30/07/2015, richsh...@comcast.net richsh...@comcast.net wrote:
 I am adapting a version of the little hobber and want to use linux-CNC to
 do the ratio division between the hob and the work spindles. Additionally, a
 third axis that is actually the feed needs to be incorporated. Any thoughts.

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Re: [Emc-users] Before i go bonkers: M98, M99

[Dave Caroline]

Linuxcnc supports subroutines with a different syntax

http://linuxcnc.org/docs/html/gcode/o-code.html

Dave Caroline

On 26/07/2015, John Thornton j...@gnipsel.com wrote:
 Just because code is available in other controls doesn't automagicly
 mean it is included in LinuxCNC. That is an unrealistic expectation...

 On 7/26/2015 6:29 AM, Andreas Pettersson wrote:
 It don't seem that LinuxCNC supports M98 and M99 for repetitive tasks..
 like cutting slots with a specific distance..

 For example..

 G91 G21
 F30
 G1x-4.12
 G0x5
 M98 P1000 L9
 G0x2
 G90
 G0Z50
 M30

 o1000
 G0Z2.34
 G1x-5
 G0x5
 M99
 %

 (this would work in Mach3, for making several grooves on a cnc lathe).

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Re: [Emc-users] Small cnc-controlled chuck

[Dave Caroline]

Use a collet chuck with auto closing.
I have seen one machine where the wood was pushed through a square
driven collet and over a grinding head similar to a swiss lathe. was
making fishing floats in balsa

Dave Caroline

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Re: [Emc-users] OT: lathe cut-off tool FS advice

[Dave Caroline]

I used to drive a capstan for long periods, getting the blade right
was key to less cleanup work, taper the end but the right amount for
your material, part drops off no pip, then over travel to clean the
bar pip. That was in my HSS days.

I have now crossed over to a sandvick insert with is pretty damned
good even on on a manual lathe
http://www.greenwood-tools.co.uk/shopscr23.html
http://www.sandvik.coromant.com/en-gb/products/t-max_q-cut/Pages/default.aspx

the inserts come in left right and flat forms, also reasonable for
turning in tight places

I also hand grind HSS for tiny clock/watch parts, getting the edge on
centre is critical for good work

Dave Caroline

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Re: [Emc-users] X-mode Breakout

[Dave Caroline]

I only found something called XP mode for a printer port

Dave

On 29/06/2015, Gene Heskett ghesk...@wdtv.com wrote:
 On Monday 29 June 2015 11:07:24 Todd Zuercher wrote:
 Does any one know of any breakout boards that will work with X-mode? I
 mean besides simple straight through terminal blocks. Preferably
 something with isolation and buffering.

 Since google is flooded with the energy drink and something Subaru is
 doing, perhaps a definition of x-mode might help?

 Cheers, Gene Heskett
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Re: [Emc-users] X-mode Breakout

[Dave Caroline]

what X-mode

Dave Caroline

On 29/06/2015, Todd  Zuercher
zuerc...@embarqmail.com wrote:
 Does any one know of any breakout boards that will work with X-mode? I mean
 besides simple straight through terminal blocks. Preferably something with
 isolation and buffering.

 --

 

 Todd Zuercher
 mailto:zuerc...@embarqmail.com

 
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Re: [Emc-users] Threading wizard problems

[Dave Caroline]

Just waiting is a symptom of not seeing the index pulse

Dave Caroline

On 23/06/2015, Marius Liebenberg mar...@mastercut.co.za wrote:
 Any suggestions please gents?

I am testing a wizard that Robert Adams is doing for threading with
Linuxcnc. There are problems with the Gcode but I am not clued up
enough
to help. Below is the code that is generated but it does not execute.
It
runs to G76 and then it just waits there.
I think the I and K values are swapped and the I must be negative for
outside thread but cannot tell anything more.

G18 G90 G7
G21
G94
G97 S828 M3
T3 M6
M8
F401.1
G0 Z2.54
G0 X8.635
G76 P1.25 Z-15 I0.635 J0.2 K1.083 Q0 H0 L2 E1.083
M9
M5
M30



-
Regards / Groete

Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
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Re: [Emc-users] what causes stepper motor stall

[Dave Caroline]

While mentioning the top speed no one is mentioning the acceleration
rate, try slowing that down. Also increase supply voltage to the
motor/drive as this also gives a faster more powerful response from
the motor drive combination.

Dave Caroline

On 05/05/2015, Tom Easterday tom-...@bgp.nu wrote:
 Thanks, I'll give it a try tomorrow.  I did see in the Vexta manual that it
 be connected as you suggest so I am hoping this is my problem and not a bad
 motor or drive as Jon alluded to (Thanks as well, Jon).
 -Tom

 On May 4, 2015, at 8:41 PM, Peter C. Wallace p...@mesanet.com wrote:

 Just to make sure its not a current drive issue, can you try connecting
 the step and dir signals to the 7I85S such that the 7I85S sinks current to
 drive the OPTO? The current batch of 7I85S's sink current better than
 source so you would connect the OPTO + to 5V and OPTO- to 7I85S output to
 get maximum drive

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Re: [Emc-users] Backlash - what are ok numbers?

[Dave Caroline]

+0 -0 is an ok number for climb milling, which most CAM thinks it is
ok to do for best finish, else you should program your paths for
conventional milling where the play is taken up by the cutting force.

Dave Caroline

On 07/04/2015, Karl Jacobs karl.jac...@gmx.de wrote:
 just for correctness: 0.1mm is about 4 thou, not 2.5 ...
 Cheers,
 Karl
 (a traveller between the metric and imperial parts of this planet)


 Am 07.04.2015 um 07:01 schrieb dave:


 On 04/06/2015 12:29 PM, Gene Heskett wrote:
 On Monday 06 April 2015 14:12:31 John Alexander Stewart wrote:
 Hi all;

 Finally fixed the Oldham couplers for my X/Y axes on my latest build,
 and was measuring backlash for inserting in the LinuxCNC ini file.

 This is for a G0704 style of mill conversion, using one of those
 kits from the old KeilingCNC place.

 X/Y/Z is 0.1mm, 0.24mm 0.1mm  or, 2.5 thou, 9 thou, 2.5 thou.
 The 2.5 thou is a bit loose, bigger balls in the nut perhaps?

 The 9 thou Y indicates either the thrust bearing at the solidly anchored
 end of the screw is duff, or perhaps not properly assembled.  I was able
 to fix one of those in a cheap 16mmx5 Chinese screw on my toy lathes z
 by padding the outer ring separation with some half thou alu foil shims.
 Several of them stacked. Tricky to cut too.  Seems to be holding up so
 far.

 Is this considered ok or out of range?

 I've put these figures in my mill ini file, and it's currently running
 the X and Y axes back and forth; will measure it again after a bit of
 wearing in.

 Any thoughts/comments?

 (as an aside, Andy Pugh's feedback for spindle soft-gearing works a
 treat - thank you again Andy)

 John.
 Let us know what you found John, it helps the next person with a similar
 problem.

 Cheers, Gene Heskett
 I've been dealing with a loose Y axis on my cinci contourmaster; this
 machine
 is set up so one can turn either the ballscrew or the servo motor to
 adjust
 position. The so-called lock on the servo end was loose and so the
 backlash
 was self-adjusting;out to unusable amounts.   Ugh. I'm in the process of
 a dual fix ... complete rebuild the mount for the ballscrew so I can
 lock it down tight and add a 10 5 um glass scale for reference.
 For now I will connect just the glass scale with it's attendant tuning
 problems (just not quite enough counts) but the future holds a config
 where P and D are fed from a 40K count/in encoderon the ballscrew and I
 is driven by the glass scale in like manner to Stu's big machine.

 Some years ago I was asked to fab a bunch of blocks for a US First
 robotics team. Set them up and ran as a batch.
 When finished I miked them to see how I'd done. SD was 0.001 but the
 dimensions were all large by about 2 thou. This on a machine (mazak)
 with 0.0025 backlash on both X and Y. Appropriate cutter comp might have
 landed these in the right range if it made a difference. ;-) Just
 personal experience.

 Dave

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Re: [Emc-users] Cleaning machinery

[Dave Caroline]

Some times it just needs to be a complete strip so you can remove bad
paint and rectify faults. My hobbing machine probably from the 1940s
had revolting paint and grime on the outside and a layer 1/2 to 1
thick in the coolant tank which is integral but under the main unit,
plus the slide had rusted and I planned on cnc so needed to get inside
to see what gearing ratios etc were in it.

Cleaning was a white spirit to remove outer grime then wire brush on
cast finishes, for joint faces I use a HSS lathe tool but ground as a
scraper, not too sharp, great for getting the jointing compound or
surface rust off cast iron without the damage a sharp wire brush can
inflict.

Some surfaces need a fine wet and dry paper(880-1200 grit) to make
them pretty again.

an example
http://www.collection.archivist.info/searchv13.php?searchstr=barber+colman

Dave Caroline

On 29/03/2015, Peter Blodow p.blo...@dreki.de wrote:
 Try to remove what can be removed mechanically with a scraper etc. Then
 I use strong anionic detergents like in household baking oven cleaner or
 motorcycle spray, letting them soak in for an hour or so, reapplying
 wehre drops have run down or drying shows. Only the very last traces are
 left for organic solvents.
 I used to know a shop where used machinery was cleaned up and made ready
 for re-selling. They had an ordinary hand held high pressure gun, but
 instead of hot water supplied with hot heating oil (or kerosene, if you
 like), the machines being supported on gratings above a car washing pit.
 There is no dirt that can withstand that. Afterwards, to remove the oil,
 washing with detergents and hot air drying followed. After all this the
 machines were ready to be sprayed with new paint.

 Peter


 Am 29.03.2015 01:42, schrieb richsh...@comcast.net:
 I just bought a 1975 vintage Anayak FV2 mill, imported to the US by DoAll.
 It has so much grease, muck, and yuck on it, I need to clean it. So far
 I've tried citrus based solvent, paint thinner, automotive, parts
 cleaner.. Applying it via green and brown scotch brite pads. Any
 suggestions on a degrease process?

 - Original Message -

 From: emc-users-requ...@lists.sourceforge.net
 To: emc-users@lists.sourceforge.net
 Sent: Saturday, March 28, 2015 2:44:22 PM
 Subject: Emc-users Digest, Vol 107, Issue 78

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 emc-users@lists.sourceforge.net

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 emc-users-ow...@lists.sourceforge.net

 When replying, please edit your Subject line so it is more specific
 than Re: Contents of Emc-users digest...


 Today's Topics:

 1. Re: Possible New Lathe (richsh...@comcast.net)
 2. ot: voltage and steppers (kqt4a...@gmail.com)
 3. Re: ot: voltage and steppers (Dave Cole)
 4. Re: ot: voltage and steppers (kqt4a...@gmail.com)
 5. 2.6.4 to 2.6.7 update without a network connection?
 (Gregg Eshelman)


 --

 Message: 1
 Date: Sat, 28 Mar 2015 15:24:42 + (UTC)
 From: richsh...@comcast.net
 Subject: Re: [Emc-users] Possible New Lathe
 To: emc-users@lists.sourceforge.net
 Message-ID:
 1991675046.16595850.1427556282912.javamail.zim...@comcast.net
 Content-Type: text/plain; charset=utf-8

 Boris? Obviously, an oversize Van Norman vertical mill, I'd say 7,000 lbs
 or so.

 - Original Message -

 From: emc-users-requ...@lists.sourceforge.net
 To: emc-users@lists.sourceforge.net
 Sent: Friday, March 27, 2015 11:45:16 PM
 Subject: Emc-users Digest, Vol 107, Issue 76

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 When replying, please edit your Subject line so it is more specific
 than Re: Contents of Emc-users digest...


 Today's Topics:

 1. Re: Converting straight lines to arcs? (andy pugh)
 2. Re: Tsudakoma TRNC-201S on a bridgeport Interact Series II?
 Crazy? (Gregg Eshelman)
 3. Re: Possible New Lathe (Gregg Eshelman)
 4. Anyone have leftovers from a 9x20 CNC conversion? (Gregg Eshelman)
 5. Re: Possible New Lathe (Gregg Eshelman)
 6. Re: Velocity closed loop + Position losed loop on an axis
 (Jon Elson)
 7. Re: Velocity closed loop + Position losed loop on an axis
 (Karlsson  Wang)


 --

 Message: 1
 Date: Sat, 28 Mar 2015 00:36:39 +
 From: andy pugh bodge...@gmail.com
 Subject: Re: [Emc-users] Converting straight lines to arcs?
 To: Enhanced Machine Controller (EMC)
 emc

Re: [Emc-users] Possible New Lathe

[Dave Caroline]

Looks like a nice casting to start a project from.
I had rear nuts on the Hobbymat MD65, utter pain.

Other thing to think about collets and taper, I usually use cheap
morse taper collets but that often gives problems for long stuff.

The good side was selling off the junk parts I no longer wanted after
using part of the MD65 lathe as my mill, a well known one has a market
for the parts.

Dave

On 27/03/2015, John Alexander Stewart ivatt...@gmail.com wrote:
 My Emco Compact-8s have the 3 M8 nuts to hold chucks on to the flange - it
 does not have the rotating collar.

 I find it fine - I don't change chucks that often (like, the ER-25 collet
 adapter has been on there for a year). Changing is pretty quick, but there
 is an art to getting the nuts threaded on - they are in tight quarters. The
 rotating collar is one that helps with this issue.

 John.
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Re: [Emc-users] PCB adapters for oscilloscope probes

[Dave Caroline]

At the very very small level Cascade has some stuff
https://www.cmicro.com/products
A design for PCBs from another maker
http://www.ggb.com/40a.html their 40A looks like a good idea

a FET probe (many makers)

and I like Peters idea of build it in or I think on a probing assembly
you put on top or under. The sites I point to above are probe tips to
add to a test jig of some sort.
Some jig images at
http://www.hsprobe.com/RFProbe.html


Be very careful your probing does not affect the circuit, It is very
easy to accidently add a micro stripline to your circuit making a
resonant element (causing ringing or worse). This comes from my
experience as part of a team working on a video switcher.

Dave Caroline

I just did a RF probing then a rf pcb probing google search

On 18/03/2015, Philipp Burch p...@hb9etc.ch wrote:
 Hello everyone!

 Thanks for all the great responses. I looks like it will boil down to
 creating something own.

 @Florian:

 Excellent idea with the DIL socket! I already thought about putting
 together something own, but those sockets for the tip connection didn't
 come to my mind. Other probes suitable for this application aren't
 available, so I'm stuck with this 3.5mm stuff, I guess. Also the SMB/SMC
 connector with the spring-loaded 3.6mm diameter is a good idea!

 @andy, Peter:

 Building the probe using a series resistor and an SMA/MCX connector on
 my own also came to my mind, but just a little too late, since the PCBs
 are being manufactured already. But it will definitely be an option for
 next time. Since you are suggesting it, I believe it will actually work ;)

 @Bertho:

 A little PCB for the ground connection seems to be a good idea, thanks
 for that!

 @Roger:

 The resistive part of the load isn't that much of a problem, since it
 does not interfere with the controller operation. I'll have to take it
 into account, but that's much less of an issue than a capacitance of a
 few pF. The signals are also quite low-impedance (at least when it comes
 to DC), so that's ok.

 Cheers,
 Philipp

 On 17.03.2015 23:20, Florian Rist wrote:
 Hi Philipp

 Now the question: Does anyone here have an idea how or where to get
 some
 spares of those adapters?

 Do you have other probes available as well? It's much easier to find
 these adapters for 2.5 mm probes.

 http://www.digikey.com/product-detail/en/PK106-4/PK106-4-ND/3587113

 http://www.keysight.com/en/pd-2422998-pn-N4864A/25-mm-probe-tip-to-pcb-adaptor-vertical?cc=ATlc=ger

 Using your probes, don't you think you'd bee good just using any
 suitable receptacle for the tip and the ground spring contact on the
 probe to connect to a ground plane? You could extract a single pin from
 precision DIL socket for the probe tip.

 If you need 'full' pcb adapter for the 3.5mm probes and since this is
 the LinxCNC mailing list, you could get a few carrier DIL socket for the
 center pin and mill the outer sleeve from a piece of brass.

 https://www.buerklin.com/de/katalog/Carrier-IC-Fassungen-Typ-MPE-GARRY-MC-Metal-Carrier-DIL-B091000.html

 (I'm not 100% sure if a standard probe tip fits in..)


 See you
 Flo

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Re: [Emc-users] Debug print in Gcode

[Dave Caroline]

Explained at
http://linuxcnc.org/docs/html/gcode/overview.html#sec:messages

debug being a special case of msg

Dave Caroline

On 17/03/2015, Marius Liebenberg mar...@mastercut.co.za wrote:
   Can someone please tell me where does the debug statement in Gcode
 print its output?



 -
 Regards / Groete

 Marius D. Liebenberg
 +27 82 698 3251
 +27 12 746 6064
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Re: [Emc-users] stepper lose steps at low speed

[Dave Caroline]

Make sure you dont power down, stay at full power, you did not mention
microsteps, Are you expecting higher resolution and accuracy than is
possible with a stepper.
You can see regular accuracy error due to the stepper when I tested a
linear axis
http://www.archivist.info/cnc/screw_error/

I also have seen some terrible rotary tables and some good ones, there
is a basic error at worm and gear rate which will/should be better at
higher reduction ratios, all the low reduction I have measured were
bad (up to .7 degree error and worm wheel rate) they were all below
60:1 the 72:1 I tested was within specification and used for some gear
cutting masters I made. The Vertex 90:1 I use seems ok not done the
full test I did on the 72:1.
Method was angle dekkor and precision polygon.

Dave Caroline

On 03/03/2015, Tomaz T. tomaz_...@hotmail.com wrote:
 What could be the reason that stepper is losing steps at very low speeds?
 On my machine I have servos for XYZ axes (Pico control), and two (leadshine)
 hybrid steppers for rotary axes, which I found out that they are loosing
 steps at very low speeds. I think it might not be related to driver and
 stepper, as I tried to switch them with some other non-hybrid stepper and
 driver and results were the same, also after changing breakout board
 My HAL content:http://pastebin.com/n6KAUE10My INI
 content:http://pastebin.com/zETiGmFT  
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Re: [Emc-users] Lathe Spindle Encoder

[Dave Caroline]

That physical example I showed is actually just an A plus index, it
was original fitment on my Starturn cnc lathe that I upgraded to
linuxcnc, even the optos are original.
Screw on chucks too

Dave

On 01/03/2015, Martin Dobbins tu...@hotmail.com wrote:



 
 If you are interfacing the encoder directly through the
 parallel port, then
 Halscope could be used to check the A-B quadrature alignment.
 No bulky test gear needed.

 Jon


 Jon,

 Thank you, all I have to do is learn how to use Halscope rather than buy an
 oscilloscope just for this.

 However, since I don't want or need spindle reverse (screw on chucks!), I'm
 thinking of trying just a single pulse to begin, or perhaps better something
 like this:

 http://linuxcnc.org/docs/html/examples/spindle.html

 at 6.1 where just phase A and index is used.

 I hope hardware setup will be easier since I won't need to get phase A-B
 quadrature alignment setup.  If that will work initially I can make it more
 sophisticated as I learn more.

 Martin












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Re: [Emc-users] Lathe Spindle Encoder

[Dave Caroline]

If using a parallel port I would say that has a rather high count,
This sort can he home brewed (48 slot) :-
http://www.collection.archivist.info/archive/DJCPD/PD/2013/2013_08_04_starturn_encoder/IMG_1631.JPG
and still give the through hole


Dave Caroline

On 01/03/2015, andy pugh bodge...@gmail.com wrote:
 On 1 March 2015 at 17:16, Martin Dobbins tu...@hotmail.com wrote:
 Would this be any use as a headstock spindle encoder?

 It could be used, and it has an index (without which there isn't much
 point).
 But that isn't a particularly spectacular price, and the coupling is
 likely to not be useful. You would need a 1:1 belt drive or gearing to
 keep the spindle through-hole.

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

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Re: [Emc-users] What Would You Do?

[Dave Caroline]

My old Starturn lathe came with a smaller drive that failed, the
repair was about £4 for a chip, it can be very cheap to do your own
drive repair.

Dave

On 08/02/2015, Jon Elson el...@pico-systems.com wrote:
 On 02/08/2015 10:40 AM, Dean Posekany wrote:

 Here's my question for the worldly experience of the group. I'm retired
 and this is a serious hobby machine and I don't have a great deal of
 money that I can throw that this. So when the inevitable failure of the
 next stepper driver occurs, what would you do? Repair the OEM750
 (~$280)? Or would you look at replacing the Parker hardware with
 something else like Gecko or maybe go the Mesa route? I've really been
 pleased with the stepper performance I get from the Parkers and the
 software stepper generation that Linuxcnc gives me is more than fast
 enough for the work I do. The repair is expensive and the drives were
 released in 1997. So they're 18 years old. I just don't have enough real
 world experience with this stuff to feel like I can make a good decision.


 Well, A Gecko 203 is less than HALF the price of your Parker
 REPAIR, and meets the
 7.5 A 75 V spec, too.  Seems like a no brainer to me!  I
 used the Gecko 201 in
 some old projects, and they were VERY good.  The reason I do
 not make stepper
 drives is because the Gecko is so good, I'd never come
 close.  It should be very
 easy to drop in Geckos as the Parker drives fail, or just
 swap them all at once.

 Jon

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Re: [Emc-users] Friction torque limiter

[Dave Caroline]

I believe
http://www.warnerelectric.com/torque-limiters.asp
has european distribution too

Dave

On 06/02/2015, Viesturs Lācis viesturs.la...@gmail.com wrote:
 Hello!

 I would appreciate, if somebody could suggest European
 manufacturer/reseller for reasonably priced friction torque limiters.
 I mean someting like this:
 http://www.nuteckcouplings.com/torque-limiters.html

 The goal is to limit the max torque between sprocket and shaft to 100 Nm.
 I have tried contacting some italian manufacturers, but they do not
 seem to care to respond. I got an offer from a german manufacturer,
 but that seems too pricey, so I would like to find some other
 alternatives as well.

 Viesturs

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