Re: [Emc-users] Freecad

[John Alexander Stewart]

Hi Bruce;

They are either dinosaurs, ref:

https://www.zdnet.com/article/microsoft-developer-reveals-linux-is-now-more-used-on-azure-than-windows-server/

or they are using DirectX, rather than OpenGL.

I did spend a *little* bit of time on the HTML5 standards group, and was
interested to hear of the reasons for WebGL being at such a low level (my
thought was that it should provide more  standardized methods) as note the
name is not WebDirectX.  Now, I'm likely totally wrong, but companies tied
to DirectX have an incentive to keep Windows up there, and they are slowly
getting hammered, and re-writing for OpenGL is of course $$

My random thoughts, anyway.

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Re: [Emc-users] pot for vfd

[John Alexander Stewart]

Does it need cleaning? It might be a simple fix to spray some "contact
cleaner" inside of the pot (often you can spray some in where the contacts
and back cover don't quite meet)

Might be worth the try?

On Fri, Jun 5, 2020 at 10:53 AM grumpy--- via Emc-users <
emc-users@lists.sourceforge.net> wrote:

> a few years ago i switched my lathe to a 3 phase motor and vfd
> i added a 10k pot to the lathe panel
> recently the motor speed started fluctuating
> i switched the vfd back to using the pot on it's front panel
> no more fluctuation
> can someone recommend a 10k pot that will handle the vibration
>
>
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Re: [Emc-users] parallel ports configuration

[John Alexander Stewart]

does "lspci" show ports?

You may wish to "lspci > withports.txt" remove them (or, if on-board,
disable in BIOS) reboot, "lspci > noports.txt", and do a diff between the
two text files, to help see what the system thinks.

John.


On Tue, Jul 10, 2018 at 8:14 PM yomin estiven jaramillo munera <
yejm...@gmail.com> wrote:

> Hi guys, I need configure 2 parallel ports  PCI express (
> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?WCH) for a application of 6 axis.
> however I am having some problems with the recognition of parallel ports in
> Debian.
> Someone knows what can I do with that?
> I need that linuxcnc recognizes the 2 ports. but i must do a initial
> configuration from terminal.
> can you help me?
>
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Re: [Emc-users] Pendants for LinuxCNC or MachineKit

[John Alexander Stewart]

John;

I could give you my machine config, but it might be confusing, as it is not
"textbook optimal"

Start here by googling "linuxcnc xhc-hb04" and see what you get.

Basically:
1)
loadusr -W xhc-hb04 -I xhc-hb04-layout2.ini -s 4 -H

There are at least 2 button sets, mine is "layout2"

2)
# Home button
net home halui.home-all <= xhc-hb04.button-home


I'll add text from a file below - you can see that I've had it for a while,
but it shows some button mappings:



XHC HB04 Pendant connected to KC20:

Last updated Sept 04 2015

Row 1:
BUTTON=17:button-resethalui-estop-activiate
BUTTON=16:button-stophalui-program.stop

Row 2:
BUTTON=01:button-goto-zerohalui.mdi-command-09
BUTTON=02:button-start-pauseNC
BUTTON=03:button-rewindhalui-program.step
BUTTON=04:button-probe-zhalui.mdi-command-03If pyvcp.o957 is true.

Row 3:
BUTTON=0C:button-spindlehalui.spindle.forward
BUTTON=06:button-halfNC
BUTTON=07:button-zeroor with selectorzero selected axis
BUTTON=08:button-safe-zhalui.mdi-command-10

Row 4:
BUTTON=09:button-homehalui.home-all
BUTTON=0A:button-macro-1NC
BUTTON=0B:button-macro-2halui.machine.on
BUTTON=05:button-macro-3NC

Row 5:
BUTTON=0D:button-stepxhc-hb04.stepsize-up
BUTTON=0E:button-modexhc-hb04-stepsize-down
BUTTON=0F:button-macro-6halui.spindle.decrease
BUTTON=10:button-macro-7halui.spindle.increase

Selector:
off, X,Y,Z,A, Spindle.

feed knob - xyza movement; spindle override, feed override?

Display:

shows:
axis-pos-feedbackpos-absolute
axis-pos-relativepos-relative
spindle-rps
feed-override



On Mon, May 7, 2018 at 1:33 PM, andy pugh  wrote:

> On 7 May 2018 at 17:47, Ken Strauss  wrote:
> > One can delete all of the tracking garbage starting with the question
> mark:
> > https://www.ebay.ca/itm/CNC-USB-Hand-Wheel-Pulse-
> Generator-MPG-Pendant-for-M
> > ach3-3-Axis-Router/271618047181
>
> You can delete the item description too.
>
> https://www.ebay.ca/itm/271618047181
>
> --
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> "A motorcycle is a bicycle with a pandemonium attachment and is
> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
> 
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Re: [Emc-users] Pendants for LinuxCNC or MachineKit

[John Alexander Stewart]

Hi John;

Absolutely - have one on one of my mills. I added it what must be a couple
of years ago; I believe that the "XHC-04" is what it is called.

I've got spindle control, jogging, zero setting, and probably other things
- not all the icons are in use, but more than enough to use it 90% of the
time after machine is homed; only the "start" button is now only used on
the monitor.

On Mon, May 7, 2018 at 12:25 PM, John Dammeyer 
wrote:

> Don't know if this link will make it through but a search of EBAY for
> "Wired USB MPG Pendant Handwheel Hand Wheel LCD Display for CNC Milling
> Router"  brings up this wired pendant.  Does this work with LinuxCNC and/or
> MachineKit?
>
> Thanks
> John
>
>
> https://www.ebay.ca/itm/CNC-USB-Hand-Wheel-Pulse-
> Generator-MPG-Pendant-for-M
> ach3-3-Axis-Router/271618047181?_trkparms=aid%
> 3D222007%26algo%3DSIM.MBE%26ao
> %3D2%26asc%3D20180124145912%26meid%3D7e85757f7c5b4a4193ccd1373886
> 3a81%26pid%
> 3D15%26rk%3D5%26rkt%3D6%26sd%3D401277102389%26itm%
> 3D271618047181&_trksid
> =p2047675.c15.m1851
>
>
>
> 
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Re: [Emc-users] non-contact position sensors, surprisingly good performance.

[John Alexander Stewart]

Hi Gene;

Regarding the DM1182 - Ok - I see what it is you are doing. Very
interesting - I've been out of the loop for a year or two and getting back
into it.

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

[John Alexander Stewart]

Regarding the g0704 z axis and the automation direct 120v system, could
someone post a link to the product?

All in this thread an interesting discussion, thanks - John.
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Re: [Emc-users] ATS-667 again

[John Alexander Stewart]

Thanks David and Gene;

Thanks for the responses.

1) The stiffness of mounting is one that I had not really thought much
about but makes sense.

2) a higher tooth count gear is something I'll look at this AM. Have lots
of old gears kicking about - and, the idea of adding a bit of steel gooped
to the side is a good idea!

3) This lathe is belt driven, so no rigid tapping, and I had adopted Andy
Pughs' HAL feedback loop for a two-speed mill which works very well. IIRC,
Andy had it working for his 6-speed horizontal mill, so crossing fingers, I
can get it going for this 6-speed lathe.

Funny how a project will sit for a year or two, then get exciting again!

John.
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[Emc-users] ATS-667 again

[John Alexander Stewart]

Hi all;

I am restarting an older CNC lathe conversion - an Emco Compact-8, fwiw.

I have the 5i25 and 7i76, and 6 ats-667 sensors for spindle. (6, because if
I only ordered 3, I'd end up breaking one, and shipping is expensive...)

Any wiring issues I should be aware of?  Field voltage is about 8v; well
within the range of the ATS-667. I have some small relays for driving the
VFD for the spindle, also driven off of field power.

The Emco spindle has a 40 tooth gear, and the aluminium pulley has a set
screw, so I should be ok with that - 40 teeth should be more than enough,
right?

Thanks for any advice/war stories you are willing to give.

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

[John Alexander Stewart]

Interesting - thanks, and tell us how you get on with them.

John.
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Re: [Emc-users] I bought a Unimat SL1000

[John Alexander Stewart]

Hi Greg;

I'm going to attempt to CNC it using 3D printed mounts for NEMA 17 stepper
> motors. The plan is to make them with channels I can fill with urethane
> resin and perhaps some pieces of metal if they don't prove sturdy enough.
> I'll also be embedding Rivnuts to provide solid threads where needed.
>

Mine's been sitting for a number of years collecting dust - did some CNC
stuff on it, but (to be honest) while I had an SL1000 when I was a kid,
getting another one after having "real lathes" was a bit of an eye-opener.

The CNC-d Unimat SL was good at MakerFaire and other shows, though.

Here's a link: http://cnc-for-model-engineers.blogspot.ca/search?q=unimat -
4 years ago already... Time flies.

Tell us how you progress -

JohnS.
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Re: [Emc-users] 3D Printers (Gregg Eshelman)

[John Alexander Stewart]

Greg:

If you want inexpensive but good quality and compact, check out the
> Monoprice Select Mini. (AKA Malyan M200)
>

Very interesting - thank you for the pointer. I may have to re-think my "no
3D printer at home"...

John.
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Re: [Emc-users] Emc-users Digest, Vol 131, Issue 89

[John Alexander Stewart]

Two replies here:

From: Andrew 
>
> > The olde Stratasys that I had access to at work (I have since left)
> > produced items about 1,000x better than I ever got from my home printer,
> > despite weeks and weeks of tweaking the home printer.
> >
>
> Do you mean FDM Stratasys?
> What was so good about it (or so bad about your home printer)?
>

Stratasys:
Yes, an older FDM machine. Cost (CA $$) well above 40,000.00.

It would print in two materials so one could make overhangs without
printing supports on same material.

It generally printed the shape you wanted.

The Home machine - Printrbot Simple. The wooden kit. The Dremel sanding
disks with fishing line for the X and Y axes actually worked quite well.

The wooden print bed was not flat. The machine had "droop" when arm was way
out away from body. The first power supply was DOA. The main board
eventually gave up the ghost (z axis) but was replaced for reduced cost.
The coupling for the acme screw for Z axis wobbled, so the z axis would
produce "ripples" or "waves" on what should be flat surfaces.

Eventually got the aluminium extruder, and printed the bits for
toothed-belt X and Y.

Oh, also some thermal issues - zero the Z axis, print for a couple of
hours, and Z axis was out. Zero it when hot, and when cold, it was out the
other way.

BUT (and, I can understand Andy's comment) it was an interesting learning
experience, and produced some useful parts.



> From: Chris Albertson 
>
> I see the argument as going like this
>
> One group says these 3d printers are worthless because they can't be used
> to make the stuff I am now making.   For example  "I can't print an exhaust
> valve for a diesel truck motor."
>

3D Printers are most definitely the way of the future. But, sometimes it
pays to contract out what one could do at home; car oil changes I have
done, but I'll let someone else do it, especially when it's -40c outside.

I do have more ties to on-line 3D Printing services than I want to put into
email. I have watched one of the industry leaders go from a start-up to,
well, the industry leader, from the vantage point of watching someone I
knew quite well go through the experience.

Another ex. colleague of mine designs antennas, and prints them. Seeing an
antenna printed on mylar, that actually works, is really neat.

What is printed is amazing, and will continue to evolve. No doubts about
that.

 Back to work; thanks for ALL of the discussions here.  John.
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Re: [Emc-users] Emc-users Digest, Vol 131, Issue 87

[John Alexander Stewart]

Andy to my comment wrote:

>> Do you really need a 3D printer?

> No, nor do I need a lathe or milling machine, I could get parts made
> by machine shops. Or simply not bother making stuff at all.

True enough, although a group of us do tend to share tools - last foreign
user of my machine shop made some over-size BA bolts by printing at work in
nylon a 43 tooth 1 Module gear and using one of my metric feedscrew
change-wheel lathes -  it was just easier for him to do this and continue
on his restoration project.

He calculated the gear train, designed the required gear in MATLAB, got it
printed by watching the machine squirt it out, and then had the pleasure of
using it - all without actually owning a 3D printer.

The olde Stratasys that I had access to at work (I have since left)
produced items about 1,000x better than I ever got from my home printer,
despite weeks and weeks of tweaking the home printer.

Am I glad I got my 3D home printer? Yes! Am I glad I put it on a shelf
never to touch it again? YES!!.

;-)

Regards - John.
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Re: [Emc-users] 3D Printers.

[John Alexander Stewart]

I've got a 3D printer here, a PrintrBot Simple, wooden one.

The city library has a set of printers and laser cutters. I think I'd use
that. Current project, drawing up some parts that will get printed at the
library or at Shapeways.

Do you really need a 3D printer?  I don't - my Printrbot is sitting on a
shelf as a bit of art work, kind of looks steam-punky. ;-)

(I build model live steam locomotives, and, plastic and hot coal and steam
might not work too well, but your application may be perfect)

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

[John Alexander Stewart]

Andy -

The guys at the shop where I last worked beside used to slightly grind the
flutes of a standard end mill, leaving (say) 6mm of flute length for
cutting pockets.

That way, the "higher up" flutes did not re-cut swarf, and thus deflect the
tool, and there was no tool rubbing on the higher up sections, either.

They cut many complex shapes used in space, air, water, and underground, so
they were well worth asking for advice.

Maybe that would do for you?
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Re: [Emc-users] Tida_TD-1336_lathe

[John Alexander Stewart]

Kirk - why replace the tailstock? With gang tooling, you'll be able to make
lots of things...

(I'm -slowly- CNCing a smaller 8x18 lathe)

John.
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Re: [Emc-users] ATS667 help plz

[John Alexander Stewart]

By the way - this is all good. I've dug out my ATS-667s from my storage
box, as this winter's project is to continue the long -dormant CNC lathe
conversion.

VFD is done, now slowly working on the spindle sensors, so great timing
Gene!

(slowly == work and life and family get in the way, but progress is slow
but sure on all my projects)

John.
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Re: [Emc-users] Question regarding fuses, line reactors

[John Alexander Stewart]

Andy - that's a good point about "plug-in" equipment.

The lathe with original motor does not have a fuse, nor does my larger
plug-in lathe, nor my mill. All with capacitor start "2-phase" motors;
either 120v or 240v. My 240v circuit is fused for 15A. I generally only run
1 machine at a time, so one 15A 240v circuit has done me well for a couple
of decades.

Maybe I'm over thinking this...

John.




On Tue, Nov 1, 2016 at 8:59 AM, andy pugh <bodge...@gmail.com> wrote:

> On 1 November 2016 at 12:33, John Alexander Stewart <ivatt...@gmail.com>
> wrote:
> > The VFD suggests 10a external fuses, plus a line filter. I'm running this
> > on 240v, over here in North America.
>
> I don't know what your standards are in the US, but as the lathe is
> "plug-in" equipment it may be that it doesn't matter.
> I tend to prefer MCBs to fuses. In the UK the domestic-wiring
> suppliers only go down to 3A, which may be too big for some equipment
> wiring. My 12V/60W power supplies ended up with 1A class D breakers
> from RS but even those were not slow enough for the PSU inrush
> current.
>
> For the input-side filter, search eBay for the "Rasmi" brand. Lots of
> different types and pretty inexpensive.
>
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> designed for the especial use of mechanical geniuses, daredevils and
> lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916
>
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[Emc-users] Question regarding fuses, line reactors

[John Alexander Stewart]

Hi all;

Back to my CNC lathe project; it has sat dormant for a few years now.

Opinions wanted:

The VFD suggests 10a external fuses, plus a line filter. I'm running this
on 240v, over here in North America.

Are 10A slow blow 250v glass fuses ok for this application?  Is it overkill
to fuse both hot leads, I presume so, but if I'm going to the bother of
putting in 1 fuse holder... Also, I could use class J fuses, but note that
glass fuses seem to be just fine for other workshop equipment.

Line Reactors. 10A. Generally a good idea or not really worth worrying
about?

The 3-phase from the VFD will be in a metal braid for shielding, grounded
at the VFD end. The 4-wire cable will have the U-V-W + ground, weird to
ground both the VFD side and the motor, but that's the way it's done, I
guess.

The lathe is an 8x18, Austrian made lathe. Would have loved a Tormach, but
the size of the thing would mean a new house, and *that* gets expensive.

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

[John Alexander Stewart]

Peter;

On Sun, Oct 23, 2016 at 9:27 AM, Peter Blodow  wrote:

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

If I attach an older PC, or Mini-ITX board to the side of a machine
cabinet, is that ok or is it "dedicated" in your eyes?

I kind of like attaching the computers to my machines - they are all on
casters, so I can roll them around if/when I want to.

John.
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Re: [Emc-users] Problem upgrading from 2.7.4

[John Alexander Stewart]

Russell - is there a "z" axis on your machine?

John.

On Wed, Oct 12, 2016 at 12:00 PM, Russell Brown  wrote:

> Quoth andy pugh.
> >On 12 October 2016 at 08:49, Russell Brown  wrote:
> >> If I click 'OK' linuxcnc loads but the initial X & Y show as 4.23e+289
> >> and 2.95e+240 and axis.ngc is not showing in the display.
> >
> >Is this one of them "Universal" milling machines, for milling entire
> universes?
>
> The heating's come on today so it's probably expanded a bit but not that
> much :-)
>
>
> >It might be as simple as a position.txt file with bad numbers in it?
>
> Hm.
>
> A) that doesn't explain the weird error message about axis.ngc.
> B) the same position.txt works with 2.7.4
> C) deleting position.txt doesn't fix either problem.
>
> FWIW, position.txt contains:
>
> 211.51237592697140144
> -82.01800169944763752
> 99.75883250664918478
> 0.0
> 0.0
> 0.0
> 0.0
> 0.0
> 0.0
>
> I've just tried sim axis_mm.ini with 2.7.7 and it also generates the
> spurious popup about "Bad character 'z' used" in axis.ngc :-(
>
> Created a new user (to avoid config issues), logged in, ran 2.7.7 and
> picked sim.axis/axis_mm..  same popup error message about "Bad
> character 'z'" near line 12 in /usr/share/axis/images/axis.ngc.
>
> If I try to open "/usr/share/axis/images/axis.ngc" from the File menu I
> again get the error message.
>
> If I try to open a previously used simple .ngc file, linuxcnc complains
> that the tool (tool 1) isn't found in the tool table  even though
> tool 1 *is* plainly there if I edit the tooltable.
>
> If I try to 'cut' axis.ngc, it wants me to home; I do that but X & Y go
> from 0 to X -1.26e+58 and Y 3.11e+231.  Click run again and it pauses.
> When I click pause to continue, I get the error "can't do that
> (EMC_TRAJ_SET_TELEOP_ENABLE) in auto mode with the interpreter idle".
>
> Uninstalled 2.7.7 (apt-get remove --purge linuxcnc), reinstalled 2.7.4
> (apt-get install linuxcnc=1:2.7.4) and, still as my new test user, fired
> up linuxcnc with sim/axis_mm.ini.
>
> No complaints about bad characters, no silly numbers on homing and the
> sim happily 'cut' LinuxCNC as expected.
>
> Just for fun, I tried 2.7.5 and it's borked in the same way as 2.7.7.
>
> Tried building a git pull of linuxcnc-dev but configure fails saying
> python is too old (2.7 needed; lucid has 2.6.5).
>
> Somethings very broken with 2.7.5+ on lucid :-(
>
> So...  am I stuck on 2.7.4 ?
>
> --
>  Regards,
>  Russell
>  
> | Russell Brown  | MAIL: russ...@lls.com PHONE: 01780 471800 |
> | Lady Lodge Systems | WWW Work: http://www.lls.com  |
> | Peterborough, England  | WWW Play: http://www.ruffle.me.uk |
>  
>
> 
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Re: [Emc-users] Probe cycle switches to MDI

[John Alexander Stewart]

Danny - not an answer, but I do find sometimes that my USB MPG will cause
that to happen.

It is on an older version of LinuxCNC that I should update sometime, hoping
that a bug fix has cured it.

Sorry for no answer, but at least you know you are not the only one. ;-)

John.
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Re: [Emc-users] 5i25 failure?

[John Alexander Stewart]

> >> I'm afraid the technical details are above my pay grade. I can however
> >> help you with Mesa cards that relate to Linuxcnc.
>
>
Just got the 5i25/7i76 plug and go kit from Mesaus.com, shipped to Canada
via USPS/Canada Post, and it all worked flawlessly.

As an aside - I really like the USPS shipping - inexpensive, and the
"border brokerage fees" for UPS or FedEx are incredible. This came out
about $50.00 less via USPS.

:-)

John.
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Re: [Emc-users] LinuxCNC officially rocks

[John Alexander Stewart]

On Mon, Aug 29, 2016 at 7:52 AM, Ron Ginger 
wrote:

> >> > On 28 August 2016 at 00:18, Jon Elson  wrote:
> >>> >> Oh, they have the share data if you click the link for the
> >>> >> whole survey.  VERY impressive numbers for LinuxCNC!
> >> > All based on a total of approx 18 responses from LinuxCNC users,
> >> >
> > JUST 18??  Hmm, this is a pretty sparse survey, then.
> > Disappointing.
> >
> > Jon
>
> Yes, that is a very unrealistic survey. 
>

Well, at least I know that there are at least 18 others out there using
LinuxCNC so it was not totally wasted!

;-)

https://en.wikipedia.org/wiki/Lies,_damned_lies,_and_statistics

John.
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Re: [Emc-users] LinuxCNC officially rocks

[John Alexander Stewart]

Agree that LinuxCNC is fantastic.

What gets me is the number of Mach3 users - why don't they switch? Is it
that they are (essentially) computer illiterate, and know only Windows
(barely), or is it just momentum in the home hobbyist field??

(I'm lucky in that I was "into" wire-wrapping computers as a teenager (RCA
1802, Intel 8085...) but I do understand that many of my age group have a
different relationship with computers, so when I ask the first question,
above, it's not meant as a slight against them - it's just - how do we get
more people to use and improve LinuxCNC?)
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Re: [Emc-users] Need some advice

[John Alexander Stewart]

On Sat, May 14, 2016 at 8:03 PM, Gene Heskett  wrote:

>
> You are dreaming John, it has 3, maybe 6mm studs screwed into the back of
> the chuck, which fit thru matching holes in the spindles flange & you
> have to putz around 20 minutes a nut to get the nut started straight,
> because theres not any real room between the flange and the spindle
> housing for fingers.
>

I don't understand the issue with this. My go-to EMCO Compact-8 lathe has 3
M8 bolts that you need to thread nuts on and tighten to hold chucks in
place.

It is dead simple, and very fast. About the same as getting my L00 lathe
chuck changed on my larger lathe.

Maybe, with Genes' little 7x lathe, it is too small for fingers to fit, and
it is a hassle??

John.
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Re: [Emc-users] CAD/CAM for LinuxCNC

[John Alexander Stewart]

Well, OnShape is available for Linux. I am currently figuring that package
out. Not sure about CAM, but will try CamBam on the output.
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Re: [Emc-users] Lathe limit puzzle

[John Alexander Stewart]

Andy;

I rejected that idea on the previous lathe because of the tailstock.
> I hadn't considered it on this lathe but it might be the answer. I
> just have to remember to move the tailstock out of the way.
>

I expect to put an estop switch on my tailstock, and home close to the
"tailstock end" of the lathe, for those times when the tailstock is locked
too close to the headstock. (better to estop on stupidity than destroy
something, or loose position, right??)


My Unimat CNC homes at the tailstock end, but no tailstock, but for my
larger lathe (whenever it comes up in the queue to finish...) it will have
the tailstock.

Homing the lathe at headstock end seems like it would be courting disaster.

John.
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Re: [Emc-users] Any Interest or Ideas for a Linuxcnc Fest 2016 ? Continent?

[John Alexander Stewart]

Why don't you guys meet up at the CNC Workshop, in Dearborn Michigan?

It is at the Tech Shop Detroit, which is a very interesting place (as is
the Henry Ford museum, and Greenfield Village, almost adjacent to Tech Shop)

The CNC Workshop could still do with some LinuxCNC discussions/seminars,
and I really don't think I'll be able to make it this year.

Ron Ginger would (I believe) be quite open to having some more LinuxCNC
talks, even if very informal, and we do need to get out there and promote
this incredible bit of software.

Just an idea - John.
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Re: [Emc-users] CNC Workshop - we need LinuxCNC/MachineKit talks.

[John Alexander Stewart]

Hi Jim and others:

http://www.thecncworkshop.com/

I found that each and every one of the attendees and exhibitors and vendors
were down to earth, nice people. It was a pleasure to be there. Techshop
Detroit was very accommodating.

Ron Ginger was also a pleasure to meet in person.

I did have my machine-kit driven CNC lathe there last year, which drew a
bit of interest. This year they do have a CNC lathe build, but IIRC the
interface used is one of those expensive, Mach-only ones. (Ron - pardon me
for rooting for the LinuxCNC vendors!)

It would have been interesting to use a pico or mesa interface and show
LinuxCNC also running on the build-lathe - but it will not be me doing it
this year.


John.
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[Emc-users] CNC Workshop - we need LinuxCNC/MachineKit talks.

[John Alexander Stewart]

Hi all;

Last June, I attended the CNC Workshop in Dearborn Michigan, and gave two
talks on LinuxCNC.

(I have the notes up at cnc-for-model-engineers.blogspot.com if you want to
see what I presented)

It was a good time, with great people. It was worth the 8 hour each way
drive.

This year, I'm in the midst of contract negotiations, and am unsure whether
I'll be able to take time off, so I can not commit.

Can someone (or, a group) go and present something on LinuxCNC and/or
PathPilot and/or MachineKit?

Even if someone takes my slides and presents them again, but with their own
experience wound in, it might be a start.

The audience was small, so the presentation was intimate, and almost
one-on-one, which was great IMHO.

FYI - I really enjoyed Dearborn, the Henry Ford Museum, and the Greenfield
Village, which is right around the corner from the CNC meeting. I'd love to
go back this year, but can not commit at this time.

John.
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[Emc-users] Andy Pugh and his bike go on Hackaday

[John Alexander Stewart]

Just FYI - I don't know if I have seen this on this list but on hackaday.com,
there is a post about Andy and his Ner-A-Car bike, and LinuxCNC.

http://hackaday.com/2016/04/07/1921-ner-a-car-motorcycle-reborn-with-epic-parts-remanufacture/

Good for you Andy!

John A. Stewart.
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Re: [Emc-users] XHC-HB04 on LinuxCNC

[John Alexander Stewart]

Danny, have one, have homing, zeroing axes, GOTO zero, manual spindle
machining spindle and feed speeds.

Not near machine ATM, but can send config files if you wish later.

Keep at it, it works well with linuxcnc
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Re: [Emc-users] Stepper, ideal pulses without feedback

[John Alexander Stewart]

Just FYI - about a year ago or so I purchased from Jeff @xylotex a BBBlack
and DB-25 cape - ran my Unimat SL CNC'd lathe just fine (feeding a spare
Gecko G540, 2 axes of which were unused)

BBBoard from Xylotex came with LinuxCNC Machinekit on a little SDCard. An
out of the box solution.



On Fri, Mar 18, 2016 at 3:50 PM, John Dammeyer 
wrote:

> You might look at the Replicape and a BeagleBone Black.   There are several
> other capes including one with a standard DB-25 parallel port that run
> LinuxCNC on the Beagle.   Search for MachineKit.
>
> John
>
> > -Original Message-
> > From: Nicklas Karlsson [mailto:nicklas.karlsso...@gmail.com]
> > Sent: March-18-16 12:27 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Stepper, ideal pulses without feedback
> >
> >
> > Nice box and standard port is always good, I should think about it.
> Steppers
> > are for an xyz engraver so it is essentially a mini CNC machine without
> tool
> > changer.
> >
> >
> >
> > On Fri, 18 Mar 2016 12:00:55 -0700
> > "John Dammeyer"  wrote:
> >
> > > You are welcome to look at my Electronic Lead Screw Code.  Follow the
> > link
> > > to the code.  It's written for a PIC in C.
> > > John
> > >
> > >
> > > "ELS! Nothing else works as well for your Lathe"
> > > Automation Artisans Inc.
> > > http://www.autoartisans.com/ELS/
> > > Ph. 1 250 544 4950
> > >
> > >
> > >
> > >
> > > > -Original Message-
> > > > From: Nicklas Karlsson [mailto:nicklas.karlsso...@gmail.com]
> > > > Sent: March-18-16 11:46 AM
> > > > To: emc-users@lists.sourceforge.net
> > > > Subject: [Emc-users] Stepper, ideal pulses without feedback
> > > >
> > > >
> > > > I am planning to use a micro controller for stepper step pulse
> generation.
> > > I
> > > > have considered to use an inverter card but special purpose stepper
> > > circuits
> > > > are cheap so I use one of these instead. It should be possible to
> feed
> > > timer
> > > > values then toggle should happen via DMA timer output compare values.
> > > >
> > > > Can anyone suggest how an ideal step generation curve should look?
> > > > Constant acceleration up to top speed? Constant deceleration from top
> > > > speed to zero? Or just stop generating pulses?
> > > >
> > > > Regards Nicklas Karlsson
> > > >
> > > >
> > >
>
> 
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>
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>
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>
>
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Re: [Emc-users] Learning LinuxCNC Youtube Channel

[John Alexander Stewart]

Jim - thanks for progressing with these videos.

I wonder if it might be an idea to get a mic that you clip to your clothes,
as in the intro there's a lot of echo.

Keep going!  John.
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Re: [Emc-users] junk Drill chuck from Grizzly

[John Alexander Stewart]

Gene;

Smart move.

My ER collet chucks reside on my mills, and almost never get removed.
(boring head, cutoff saw, but do not have a drill chuck that fits the
spindles)

I do have some smaller drill chucks (expensive, good) that I have on
parallel shanks, trimmed so that they will go into an ER collet, and bottom
out, but not stick out too much, maybe 2-3mm. The shanks I have are 1/2",
so fit well within an 13-12mm collet.

Sometimes it is nice to have a (good) drill chuck for the smaller drills,
otherwise sometimes 3 hands are required (hold drill, keep spindle from
rotating, tighten ER collet nut)

John.
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Re: [Emc-users] Gib screw direction

[John Alexander Stewart]

Gene;

I have the Canadian equivalent of the G0704, CNCd, and I think the Y gib
goes to the back of the machine to tighten. I did go through the exercise
to adjust the ways, but it needs doing again, and, finding out why the
backlash compensation on the Y is so high
​
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Re: [Emc-users] Micro-switch repeatability

[John Alexander Stewart]

Bertho;

I did some tests, plotted the results, etc, at:

http://cnc-for-model-engineers.blogspot.ca/2015/06/home-switch-repeatability.html

I think my major issue was the mounting for my dial indicator, and if you
do read the article, I did some tests with my new mill, and results are the
same or better.

I was *totally* surprised at how well they worked.

John.
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Re: [Emc-users] collets for this motor?

[John Alexander Stewart]

Gene;

I have quite a few sets of ER collets. My original ER25 ones are from Regio
Fix, and were expensive when I bought them. (Marcus is right...)

They are by far the best collets.

I have some ER-40s from Maritool in the USA. They seem fine, too.

I have some precision ones from CTC Tools, that are "ok" but my go-to
collets are the Regio Fix ones in the ER-25 size.

I have some cheapies from CTC Tools, like a 1/8, 1/4, 3/8 and 1/2. (these
are not their "precision" set) Fine for holding some of my inch shanked
tooling like drill chucks in the mill, or material that will get turned
down on the lathe.

Marcus is also right about the smaller ends; my Regio-Fix ER-25 collets go
smaller than the CTC tools ones, and some ER-11 collets from Arc Euro in
the UK (they have parallel shank adapters) are, I believe, half mm
increments, but sold in 1mm increments, so about 1/2 the small drills I can
not hold (maybe it was my mistake on purchase, but I should fill in
that set sometime)

BTW - about 80% of the time my lathes have ER collet holders on, 100% of
the time (and, I mean 100%) on the mills.



On Fri, Jan 29, 2016 at 6:32 AM, Gene Heskett  wrote:

> On Friday 29 January 2016 04:12:24 Marcus Bowman wrote:
>
> > On 29 Jan 2016, at 06:32, Gene Heskett wrote:
> > > On Thursday 28 January 2016 23:25:05 Ken Strauss wrote:
> > >> Note that metric ER collet sets can grip any size in their range.
> > >> However, there are gaps with most sets of Imperial sized collets.
> > >
> > > You are saying that a 3mm if comfortable with a 1/8" in it, and a
> > > 6mm can handle the 1/4"?
> >
> > No; that won't work. An ER series collet can only hold up to the
> > maximum stated size for that collet. After that, you must use the next
> > largest collet. So for a 1/8inch drill bit you must use the 3-4mm
> > collet. They are all marked with a range, and you must not go above or
> > below the stated sizes for each collet.
> >
> > You also need to be careful of the range you are buying. Some
> > suppliers sell sets which either (a) don't cover the range right down
> > to the smallest size for that range (so some ER11 sets don't go below
> > 1mm) and you would then need to buy additional collets to complete the
> > set. Or (b) some suppliers sell sets which cover the full range but
> > have too great a gripping range in the very small sizes. So they sell
> > 0.5-1mm, 1-2mm and 2-3mm etc. The better approach is to use 0.5-1mm,
> > 1-1.5mm, 1.5-2mm then rising in increments of 1mm 2-3, 3-4 etc for the
> > rest of the range. Note you can't really go below 0.5mm (20 thou)
> > because the collets are not designed to close down that far. The specs
> > for the ER11 range, from the inventors of the concept are here:
> > https://www.rego-fix.com/en/home-north-america/products/collets-reduct
> >ion-sleeves/er-collets/paction/list/pcontroller/Article/anext/1/redirec
> >ted/1/ptab/kind/size/er-11/kind/er-11-standard-mm.html
> >
> > If you go to:
> > https://www.rego-fix.com/en/home-north-america/products/er-system/er-c
> >ollets/paction/list/pcontroller/Article/anext/1/redirected/1/ptab/size/
> >size/er-11.html you will see there are different precision ranges. I
> > have not been able to find any for sale in the UK, but I guess they
> > would be, for me at least, largely unaffordable. Lots of collets are
> > sold in what we might term "value" sets. Despite what the vendors are
> > claiming, the runout is high, and, with sizes as small as ER11 that
> > can be very noticeable especially on smaller sized tools. As someone
> > else has noted (later post, I think), the cost of a good set is
> > relatively high, and can be twice the cost of the cheap-as-chips sets
> > commonly sold. There's a reason for that, and my experience has taught
> > me to buy the branded sets (like Vertex, or the Swiss Rego_Fix
> > originals) and just stump up the cash. It makes a significant
> > difference. My last set of ER11 collets, delivered at the beginning of
> > this week, and destined as collets for a grinder, were all marked with
> > both the metric sizes and the imperial sizes gripped by each collet.
> > Very handy. Cheap sets were available for £11 (roughly 20 USD) or £48
> > (roughly 90USD) and this set for £64 (roughly 110 USD). Ouch. Low
> > runout is fine by me, especially given the cost of small diameter
> > carbide cutters.
> >
> > Marcus
>
> Thanks for the tutorial, I appreciate it.  Before all this discussion
> I've bought a $23 set of 9, so I don't expect ultra low runout.  But it
> will take a while before I can exersize them.
>
> It looks like the only practical way to put it on the G0704 is to buy
> another head casting & machine to fit this 80mm motor.  So thats the
> next step.  Or sell this and buy the Sable, either the whole machine for
> $720 & ship from Taiwan, or just their spindle assembly for $99 & ship.
> But that only gives me 10k rpms, so the feed rates would still be under
> 8 ipm. As that one is a belt drive, I'd 

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

[John Alexander Stewart]

Thank you for the follow up - it was an interesting discussion to follow
(along with the "how long will a rotary table turn?" one that Marcus
started)

John.
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Re: [Emc-users] Rookie Question - Direct wire or connectors

[John Alexander Stewart]

On Sat, Dec 26, 2015 at 6:22 PM, Gene Heskett  wrote:

> On Saturday 26 December 2015 17:39:11 John Thornton wrote:
>
> > Gene got a link to one?
> >
> > JT
>
> <
> http://www.ebay.com/itm/10pcs-Aviation-Plug-Male-Female-Wire-Panel-Metal-Connector-16mm-4-Pin-GX16-4-/311141053346?hash=item487173b3a2:g:aRoAAOSwY45URiPA
> >
>
> One of many similar listings.


I'm another happy user of these things. Mainly for my "A" axis rotary
tables, as I can (dis)connect-when-powered-off easily and they are
available locally.

John
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Re: [Emc-users] Z axis stepper gradually losing position

[John Alexander Stewart]

I had X issues - observable on a long job of engraving. Job came out
slightly not square!

5I25 to a Gecko G540 - as mentioned above, inverting the polarity of the
signal(s) fixed it - I was pushing the Gecko G540 slightly too fast. Only
one input of the XYZA showed the symptom.

The machine has been rock stable since.

I'd have to go through my backup files and/or notes to see exactly what
signal was inverted.

May I suggest doubling pulse lengths, and seeing if that helps? Give the
drivers time to settle into a known state?

Good luck - John.

On Fri, Dec 11, 2015 at 8:47 PM, Gene Heskett  wrote:

> On Friday 11 December 2015 18:21:20 andy pugh wrote:
>
> > On 11 December 2015 at 22:41, Marcus Bowman
> >
> >  wrote:
> > > The tiniest error in your (software) backlash settings accumulate
> >
> > If it does, that's a bug.
> >
> > It is more likely to be that the backlash comp moves are at max speed.
> > If max speed is over-optimistic, then that can case problems.
>
> Does that not depend on the Linuxcnc version? I haven't heard it trying
> to do a backlash move at knock it out of the park speeds in quite a
> while.  I had assumed (there's that word again) that a backlash move was
> now being made not only subject to the max vel, but also, subject to the
> max-accel settings which it didn't do 2-3 years ago.
>
> Or am I dreaming?  ChangeLogs readable by us dummies might be helpful?
>
>
> 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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[Emc-users] For SamS - Emco Compact 5 PC user(s) needs help on Model Engineer website

[John Alexander Stewart]

Hi Sam - apologies for sending this to the list, but could not locate your
email address.

Model Engineer (www.model-engineer.co.uk) - get on there, and look for the
thread  titled "Emco Compact5 lathe with Welturn" and maybe you can help,
*and* spread the great work you, and others here, have done.

JohnS.
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[Emc-users] Fw: new message

[John Alexander Stewart]

Hey!

 

New message, please read <http://lamaylaw.com/lady.php?gx1rd>

 

John Alexander Stewart

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[Emc-users] Fw: new message

[John Alexander Stewart]

Hey!

 

New message, please read <http://comercioelectronicob.com/settled.php?6>

 

John Alexander Stewart

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Re: [Emc-users] CAD/CAM for LinuxCNC

[John Alexander Stewart]

re: Mach3/4 and LinuxCNC;

1) Andy's right - supporting hordes of users who come to an open source
project is a problem (been on the receiving end of *that* one...)

2) Andy's also right - LinuxCNC is not in competition. I'd use Mach3/4 if
LinuxCNC did not do what it was asked to do, but, LinuxCNC just works.

3) Not everybody will choose your option - after all, we have many
cars/trucks/planes/etc manufactured because each person (thankfully)
chooses their own requirements.

I appreciate Ron Ginger's comments - having met him, he's a down to earth,
bright individual, who bears listening to.

John.
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Re: [Emc-users] Knurling with a threading tool using spindle coordinated motion (G33) on EMCOTurn 120P CNC lathe

[John Alexander Stewart]

Very neat - thank you for posting the code and the video.

On Fri, Sep 11, 2015 at 7:52 PM, Tom Easterday  wrote:

> Here is a video of our G33 knurling routine running.  Pretty cool.  I’m
> sure we aren’t the first to do this, but since I haven’t seen it before I
> will pretend like it :-)  BTW, this knurl is only about 5 thou deep, deeper
> ones will follow.
>
> https://youtu.be/zdCQ0X7b2uo
>
> Here is the code:
>
> G8
> G53 G0 X0
> G53 G0 Z0
> M6 T3 G43
>
> # = 0.700
> # = [#/2]
> # = 0.025
> # = [# + #]
>
> # = 0.000
> # = 0.25
> # = 0.010
> # = 0.002
> # = 28
> # = 30
> # = [# - #]
>
> # = 100
>
> # = 3.142
>
> ; The surface is the circumference of the workpiece
> # = [# * #]
>
> ; Given a knurl angle, calculate Z feed given 
> # = [TAN[#] * #]
> # = [# * #]
> (debug, feed per revolution: #; per min: #)
>
> ; thread _width_ is equal to distance traveled in one rev, i.e.
> 
> # = #
> ; Thus, TPI will be 1/
> # = [1/#]
>
> ; To do a n-start thread, we need to start each thread
> ; /n further back (Z+) than the prior thread
> # = [#/#]
>
>
> M3 S#
>
> #100 = #
> #110 = [[# * #] + # +
> #]
> (debug, knurl lead in: #110)
>
> G0 Z#110
> G0 X[# - #]
>
> O100 WHILE [#100 GT 0]
>(debug, start Z: #110; feed: #)
>(calculate the lead in for the knurl AFTER this one)
>#105 = #110
>#110 = [#110 - #]
>
>;G33 Z#110 K#
>;G1 Z# F#
>;G1 Z#105 F#
>G33 Z# K#
>G33 Z#105 K#
>;G0 X#
>G0 Z#110
>;G0 X[# - #]
>
>#100 = [#100 - 1]
> O100 ENDWHILE
>
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[Emc-users] Mesa software out of date error?

[John Alexander Stewart]

Hi all;

After updating to linuxcnc 2.7.0-pre6, I got the following message:

hm2/hm2_5i25.0: Warning: sserial remote device 7i76 channel 0 has old
firmware that should be updated


Got the latest 5i25.zip from www.mesanet.com/software/parallel/5i25.zip

ran sudo mesaflash --device 5i25  --write 5i25_7i76x2.bit

powered off and rebooted the machine, still gives the warning.

Ran sudo mesaflash --device 5i25 --reload

and it still gives the warning. It would seem that I'm updating the 5i25,
but maybe I should be updating the 7i76 - correct??

Any idea of what files should be downloaded, and what process to use?

Merci - John.
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Re: [Emc-users] Mesa software out of date error?

[John Alexander Stewart]

Ok - *just* got it working.

For those with the "insmod" error,
- you run the "update7i76" as non-root (as per the readme in
sserial.zip)
- make sure you have field power turned back on; the module will NOT
load
  without the 7i76 powered up.

When I slapped my forehead, got the 7i76 powered, the update went just fine.

LinuxCNC now reports (via Show Hal Configuration) that I have gone from SW
version 0X0B to  0X0E, and the warning/error is no longer shown at startup.

Peter - thank you for these utilities, and for your constant emails/posts.
I did find
the 5i25 update on the linuxcnc forum, which helped considerably.

:-)

John.



On Sat, Sep 5, 2015 at 12:16 PM, Peter C. Wallace <p...@mesanet.com> wrote:

> On Sat, 5 Sep 2015, John Alexander Stewart wrote:
>
> > Date: Sat, 5 Sep 2015 11:37:08 -0400
> > From: John Alexander Stewart <ivatt...@gmail.com>
> > Reply-To: "Enhanced Machine Controller (EMC)"
> > <emc-users@lists.sourceforge.net>
> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net
> >
> > Subject: [Emc-users] Mesa software out of date error?
> >
> > Hi all;
> >
> > After updating to linuxcnc 2.7.0-pre6, I got the following message:
> >
> > hm2/hm2_5i25.0: Warning: sserial remote device 7i76 channel 0 has old
> > firmware that should be updated
> >
> >
> > Got the latest 5i25.zip from www.mesanet.com/software/parallel/5i25.zip
> >
> > ran sudo mesaflash --device 5i25  --write 5i25_7i76x2.bit
> >
> > powered off and rebooted the machine, still gives the warning.
> >
> > Ran sudo mesaflash --device 5i25 --reload
> >
> > and it still gives the warning. It would seem that I'm updating the 5i25,
> > but maybe I should be updating the 7i76 - correct??
> >
> > Any idea of what files should be downloaded, and what process to use?
> >
> > Merci - John.
>
> Yes, the complaint is about the 7I76s firmware
>
> download
>
> http://www.mesanet.com/software/parallel/sserial.zip
>
> cd to the utils/linuxcnc directory and read the README file
>
>
> >
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> >
>
> Peter Wallace
> Mesa Electronics
>
> (\__/)
> (='.'=) This is Bunny. Copy and paste bunny into your
> (")_(") signature to help him gain world domination.
>
>
>
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Re: [Emc-users] Lathe conversion

[John Alexander Stewart]

Hey Andy - reading your web page - Ok - the Emco Compact-8 was the one
copied extensively overseas. It was made in Austria originally.

The Compact-8 is approx 8" diameter swing and 18" between centres. The
Asian 7x lathes are NOT equivalent, and are NOT copies of the Emco
Compact-8. Some of the 9x20 Asian lathes were pretty good copies, some not
so. One I saw in a store had the tailstock rattling about with about 1mm
play. Some have various spindle threads, some have quick change gearboxes,
etc, etc.

I have two Austrian made Compact-8 lathes, and I *really* like them.  Note
that none have the vertical head on the back of the bed; that is a bit of
an issue but people keep trying it. (One of my Compact-8s did have a
vertical head added, but it's when my workshop in NL was about the size of
a single bed, so I had only 1 machine tool and a small bench; it has not
had this vertical head on it in close to 30 years)

If/when I downsize, the old english iron (Kerry, Centec, etc) will go, but
one of the Emco Compact-8s will remain, along with one of my CNC mills;
we'll see which one. That's if, no plans but you never know...

Just FYI - John.




On Fri, Sep 4, 2015 at 11:12 AM, andy pugh  wrote:

> I am converting a Holbrook Minor lathe to CNC.
> First stage, making it run on domestic power:
> http://bodgesoc.blogspot.co.uk/2015/08/holbrook1.html
>
> --
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
>
>
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Re: [Emc-users] BeagleBone and LinuxCNC for a lathe.

[John Alexander Stewart]

Hi John;

I've a small Unimat SL that I've CNC'd (and talked about it at the last
CNCWorkShop back in June, and in my blog)

Some random thoughts:

1) Beaglebone is fine. Sure, graphics is slow, but so what? Change Axis
to the DRO display and you are fine.

2) My OLD Unimat has a not so great spindle, which is a bit of a problem.
And an old motor, which is very weak.

3) Currently, I have no spindle feedback for threading.

4) Others have used stepper motors for spindle control on Unimats; one chap
in Germany, and, maybe Cecil on this list?

5) I've a larger, stronger lathe (a big brother to the Unimat - an Emco
Compact-8) that is my target lathe for CNC; not sure if I'm going to
develop the Unimat further.

I have the Xylotex cape, with the Beaglebone direct from them, pushing a
Gecko G540.

Look at cnc-for-model-engineers.bogspot.com and top left corner is a search
box, put Unimat in there. Maybe it'll give you some ideas.

John.

On Wed, Aug 12, 2015 at 5:45 AM, andy pugh bodge...@gmail.com wrote:

 On 12 August 2015 at 09:37, John Dammeyer jo...@autoartisans.com wrote:
  The lack of a spindle input or PWM output on the Probotix cape and the
  higher price of the PMDX cape rules out the Beagle for any sort of Linux
 CNC
  at the moment.  That and what appears to be a lack of continuing support
 for
  the Beagle and LinuxCNC.

 I think you may be misinterpreting the situation.

 Machinekit seems to be committed to the Beaglebone, and the Machinekit
 flavour of LinuxCNC will work just as well as old-school LinuxCNC with
 a lathe.

 All you need to do is set up one of the step generators in the PRU in
 velocity mode and connect then net spindle-speed
 motion.spindle-speed-out-rps = .stepgen.02.velocity-cmd

 (*** because I don't know the BBB PRU Hallname).

 That gives you a working lathe, though it doesn't give you an index,
 so threading won't work initially.
 However, this does not mean that threading can't work. It should be
 possible to configure a synthetic index in HAL. But I suggest you talk
 to the Machinekit folks about that.
 ( www.machinekit.io )

 As for the Probotix cape not having a PWM output, you can use a
 step-dir output. PWM is just another aspect of the PRU driver.
 If you want to convert that PWM to analogue voltage then some external
 components might be needed, but this can be as simple as a resistor
 and capacitor. Or, off the shelf,

 http://store.mesanet.com/index.php?route=product/productpath=74_78product_id=205


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Re: [Emc-users] Switches for home, limits

[John Alexander Stewart]

Gene;

The no longer required manual locks reminder gives me some additional
 freedom as that had not occured to me.  What had occured was how do I
 keep them from being demolished if not correctly positioned?

 So that opens up additional possibilities, thanks John.


The X axis on mine; I retain one of the round table stops in that front of
table dovetail that you mention in a previous email.

The microswitch is positioned on a front plate, spacers and M6 bolts to
pre-existing holes. Microswitch is horizontal so that (in theory, anyway)
the table stop will not crash into and destroy the switch.

I removed the front measuring tape, and on my front plate, I machined up
some long rectangular bars from scrap that are bolted to the front plate,
but ride in the slot where the measuring tape was; the fit is pretty close,
so the chance of swarf getting onto the microswitch is pretty small.

The Y axis - I machined a flat on the base casting, with a bunch of tapped
holes, so the Y axis switch base is just a bit of angle. Again, an existing
locking handle hole on the saddle casting is used for the trigger. The Y
axis switch is covered with a metal cover machined from something from my
scrap box (an old hammond box) such that the microswitch is covered; the
base angle under the roller machined away such that if any swarf does
indeed find its way in, hopefully gravity will help it find its way out. It
is also under the table, so I don't expect too much swarf to get in.

The only issue that I have with the Y is that there is a potential
interference with the right hand bracket for the X axis; one of these days
I'll take a file to the bracket so that I can get the full table travel
without the possibility of interference.

Hope this helps - John.
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Re: [Emc-users] Switches for home, limits

[John Alexander Stewart]

Gene:

I used (for better or worse) microswitches.

X axis - you can see it to the left of one of the pics. Uses the original
table stop and some of the screws that were in the table (for locking
handles? can't remember off hand)

http://cnc-for-model-engineers.blogspot.ca/2015/04/g0704-and-cnc-conversion-kit-last.html

The Z and Y axis:

http://cnc-for-model-engineers.blogspot.ca/2014/09/the-new-cnc-mill-kc20vsbf20g0704-part-3.html

John.
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Re: [Emc-users] Fwd: Tread Mill controller

[John Alexander Stewart]

Be warned; with my KBIC clone in my G0704 (King Canada KC20VS) I needed to
add another small power supply to power the KBIC when replacing the
potentiometer with the Mesa 7i76 board - the KBIC would barely supply
enough current for the potentiometer, but not for the opto on the 7i76.

Also, the potentiometer leads are floating around 110v, (220v if that's
your power) so it is not low voltage circuitry.

There's some info at:

http://cnc-for-model-engineers.blogspot.ca/search?q=kbic

John.

On Wed, Jul 22, 2015 at 2:43 AM, Gene Heskett ghesk...@wdtv.com wrote:

 On Wednesday 22 July 2015 01:50:48 Kirk Wallace wrote:
  On 07/21/2015 05:16 PM, George Ramsower wrote:
  I have a tread mill motor I got for the purpose of putting it on
   my lathe. I've found a few motor controllers but just haven't
   figured out which one to use.
  What I want is a controller that will control the speed I set it
   at and keep the motor turning at that speed under different loads.
   This would be a normal method of doing this so it's not unusual.
   It's a 120 volt DC motor.
  Thanks for input on this.
  
   George R.
 
  I have a soft spot for KBIC speed controllers. They use back EMF for
  speed feedback and work well from crawling to full speed. Reversing
  needs a relay and should not be switched until the motor is stopped.
  LinuxCNC can set the speed with a PWM signal to an opto-coupler then
  to the KBIC potentiometer input.
  http://www.wallacecompany.com/machine_shop/kbic/

 I think the controller in my micromill is a kbic, or possibly a clone of
 one.  The switching transistor failed several years ago, so I looked it
 up and found it wasn't much of a bug.  Surveying my pile of defunct
 computer PSU's I found a bug with 5x the current, double the voltage,
 and only about 20% more gate capacitance. When and if I replace that 200
 watt motor with the 400 watter from the lathe, it won't have a problem
 running it.  It is an extremely stiff control, so stiff I had to put in
 an ammeter to see how hard it was working as there is no detectable
 speed sag when the load goes from 120 ma running free to 2 amps and a
 blown fuse.

 You can either use the OEM potentiometer to set speed, or something like
 a mesa Spin1-x(sp?) and control it with linuxcnc.  I am running the
 micromill's spindle with a PMDX-106, so I have the best of both worlds
 as I can switch back and forth between manual control and computer. Live
 in real time.  PMDX has replaced that model with a different one but
 I've no experience with the newer version.

 
  Another driver I have used is Pico-Systems PWM driver which can drive
  the motor either way. Speed feedback will need to be with a spindle
  encoder then through a LinuxCNC PID or some other control algorithm.
  My driver needed to have the output capacitors removed for continuous
  operation, but newer drives may not need this modification. The driver
  inputs have opto-couplers so the driver signals can be connected
  directly to most interface hardware.
  https://pico-systems.com/pwmservo.html
 
  My unfinished use is here:
  http://www.wallacecompany.com/machine_shop/Shizuoka/Carousel_Overview-
 1a.png
  http://www.wallacecompany.com/machine_shop/Shizuoka/100_1136-1a.jpg
  http://www.wallacecompany.com/machine_shop/Shizuoka/100_1133-1a.JPG

 Cheers, Gene Heskett
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Re: [Emc-users] Axis DRO

[John Alexander Stewart]

Len - actually, I'd like to *find* the velocity information in 2.6...

Like you, I too find the over-abundance of numbers in the stock Axis
display confusing.

Maybe there's some toggle settings in a pull down menu that can disable it?
Not near a running machine at the moment.

John.
​
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Re: [Emc-users] encoder opto update

[John Alexander Stewart]

Cecil;

As usual, I like your style. Question - how many slots did you put on the
disc? I have an Emco Compact-8 that is the same size as yours, and I'm just
wondering what is the number most people use.

Thanks - John.
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Re: [Emc-users] encoder opto update

[John Alexander Stewart]

Cecil - no worries - at first I thought gosh - metric dimensions - very
kind of you then I figured it out! ;-)

Merci - John.

On Tue, Jul 7, 2015 at 2:33 PM, Cecil Thomas wctho...@chartertn.net wrote:

 Opps, Sorry,
 Make that .25 inches deep!

 Cecil



 The disc has 20 slots, about 2.5 deep except for the index slot



 Question - how many slots did you put on the
 disc? I have an Emco Compact-8 that is the same size as yours, and I'm just
 wondering what is the number most people use.

 Thanks - John.

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

[John Alexander Stewart]

Tom; on my larger manual lathes, HSS tooling, I'd expect a  chip load about
1/10 of what you are doing, and a speed about 1/5 to 1/10 of what you were
trying.

Mind you, maybe I'm a chicken, and I don't have Carbide cutoff
experience, so don't take the above as gospel.

JohnS.
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Re: [Emc-users] Programming services

[John Alexander Stewart]

Marius;

I think this is a good idea, but a little bit premature for me in my
current phase of employment.
​
I would also expect (from my limited experience) that an organized
LinuxCNC/MachineKit support organization, much like the Linux vendors do,
would make a lot of sense.

There seemed to be more interest in LinuxCNC at the latest workshop in
Dearborn Michigan than I might have thought; it *is* getting attention.

John.
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Re: [Emc-users] Threading wizard problems

[John Alexander Stewart]

Marius;

Out of interest - where is this wizard located? Is it available for all??

I saw Tormach's lathe at the CNC Workshop last week, and I think we have
some work to do to be as nice as that machine was

Thanks - JohnS.
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Re: [Emc-users] TB6600 Stepper Motor Drivers

[John Alexander Stewart]

Dave - As mentioned by others, cut the center tap wiring; I did this for my
Sherline Rotary table to let it run with my other machines. I used full
coil; probably could have got away with using half coil only.

Was looking at the Sherline CNC machines website last night - one of these
might make a very nice upgrade to my Unimat CNC lathe. Lucky guy to find
one used!

John.
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[Emc-users] CNC Workshop mini review

[John Alexander Stewart]

The workshop went well, in my opinion.

TechShop Detroit is an amazing place, and is an ideal host for a workshop.

LinuxCNC/Machinekit wise:
Tormach were here with their lathe, and pcnc1100 mill. Running
PathPilot.
Robert Luken had two sessions on GCode, and LinuxCNC.
Jon Elson had a LinuxCNC overview, and talks about servos and his
products.
I did two talks, one about my MachineKit equipped Unimat SL CNC'd
lathe, and the other on spindle control using LinuxCNC.

I did not know what level of experience people would be at; while there was
a wide knowledge base, my spindle talk was probably too detailed, even in a
quickly cut-down version.

I did learn a lot about other stuff. A worthwhile trip.

Next year, it would be nice to get more of a LinuxCNC/Machinekit focused
track; lots of interest in my Xylotex-caped BeagleBone, and LinuxCNC is
definitely present.

That's a direct hint to people on this email list, in case you missed it.
;-)

Thanks to Ron Ginger, Joe Katona and Will Brick (plus all of Techshop
Detroit) for hosting this event.

John A. Stewart.
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Re: [Emc-users] Schematics for a GO704

[John Alexander Stewart]

Gene;

I wired up the G0704 sensor to my Mesa 7i76/5i25 combo and use it  with
Andy's Lincurve stuff for speed feedback. And full speed control via the
same combo.

I'll be mentioning some of this at a seminar at the upcoming CNC Workshop.

Some stuff on my blog - the Canadian name for the G0704 is KC20VS, so
search for that.

Blog is cnc-for-model-engineers.blogspot.com - ask questions. (gotta run -
better half is waiting!)

John

On Sun, Jun 7, 2015 at 9:03 AM, Gene Heskett ghesk...@wdtv.com wrote:

 On Sunday 07 June 2015 06:31:00 Belli Button wrote:
  http://cdn0.grizzly.com/manuals/g0704_m.pdf

 Is exactly what came with the machine. The wiring diagram is in it twice,
 but nothing on the PCB's.

 From the sounds of it, its a scr or triac control. More evidence of that
 in the fact that the reversing switch is wired to the motor.

 The rpms display is driven by a single slot interrupter from a disk with
 round holes drilled into it on the top of the spindle.  Eg, no room for
 a disk like I put on the lathe, but the top cover of the gearbox could
 be machined away to do something similar, but would need me to design a
 new pcb to mount the slot interrupters. That means their speed display
 will not work but since we can do that with linuxcnc, thats no biggie.

 Yet TBD whether I rip out their speed control and put in one of the Pico
 servo amps. I am extremely pleased with how it worked on a similar sized
 motor on my toy lathe.  It sure simplifies the reversal as that servo
 amp handles that with no relays to putz with.

 The motor kit came Friday, and thats the first Nema 34 motor I'v seen, it
 will go on the z axis. Buying the package like that sure makes it nice.
 Looks like all I'll have to do is mount the stuff and wire it up.
 Its 2 each 470oz/in nema 23's with 8mm shafts, a 1600oz/in nema34 with a
 12mm shaft, 2 ea DM542's and a 42 volt PSU for the nema23's, a DM860 and
 a 60 volt psu for the nema34, and a bare bones but all opto, breakout
 board.  On fleabay for a tad under $400.

 I just got to get me back into working condition. I pulled something
 loose in my game knee and back getting it into position in the garage.

 Thanks Belli Button.

 Cheers, Gene Heskett
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Re: [Emc-users] Sandy box

[John Alexander Stewart]

On Fri, Jun 5, 2015 at 8:42 AM, Gene Heskett ghesk...@wdtv.com wrote:


 One thing I haven't noted yet, no on has mentioned the price of this
 little box?


Gene - I don't know about the SandyBox, but my BeagleBoneBlack, with
parallel cape plus LinuxCNC (MachineKit) on an SDCard was about $80.00 US
from Xylotex.

All I needed to ad was a power supply, correct HDMI cable, keyboard with
mouse, and I was able to transition my little Unimat CNC lathe away from an
Intel D525MW based system quite easily.

The only issue I currently have is that the Gecko G540 needs a 10khz signal
sent to it as an i'm here signal, and I've disabled this for now.

I can access this via keyboard/mouse/monitor or via my (wired) network.

John.
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Re: [Emc-users] How to delay spindle-at-speed

[John Alexander Stewart]

Tomaz;

I had the same problem:

http://cnc-for-model-engineers.blogspot.ca/2014/01/spindle-ramping-up-to-speed.html

The solution (as found in my blog page above):

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


FYI - when I put a Mesa 5i25 in there, I accurately figured out how to set
the spindle speed:

http://cnc-for-model-engineers.blogspot.ca/2013/02/kx1-5i25-and-spindle-speeds.html


John.
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Re: [Emc-users] How to delay spindle-at-speed

[John Alexander Stewart]

Scott - Hal was a bit of a problem to learn for me, too. But then one day
it clicked and now it's not really a problem. Syntax still is a bit of a
mystery at times, so I'm not near the Hal expert that many on the list is.

Keep at it, and you'll have more and more fist pumping Yeah! moments. ;-)

Work through that spindle speed example; I take scrap paper and put blocks
down with lines between them, and label everything. It makes understanding
(for me) Hal a lot easier.

Oh, and ask questions here, I have asked many questions in the past and
have had clear, concise, explanations.

John.
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Re: [Emc-users] Linuxcnc Fest for 2015

[John Alexander Stewart]

Ron;

Thank you for this email - I had wondered about the Mach4 focus of the
seminars, and wondered about Tormach/MachineKit.io/LinuxCNC seminars to
balance the sheet, so to speak.


John A. Stewart.
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Re: [Emc-users] Backlash - what are ok numbers?

[John Alexander Stewart]

Karl - Aaargh!

And to think I used to work in imperial measurements only. Living around
the world, now back in imperial land you'd think that I'd still be able
to work in thous but looks like I can't!

Thanks for the correction - John.
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Re: [Emc-users] Backlash - what are ok numbers?

[John Alexander Stewart]

I can't believe that I'm replying to my own thread, with an off-topic post.

Look on youtube for the westjet metric time video - priceless. (Canadians
are in theory metric, and I most certainly am, but almost all materials are
in inch, based on our proximity to the USA. The WestJet April 1 metric time
video is a great parody of our issues with metric)

John.
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[Emc-users] Backlash - what are ok numbers?

[John Alexander Stewart]

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.

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.
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Re: [Emc-users] Custom EMC installation? -- BINGO!

[John Alexander Stewart]

Neil;

I've got 3 of these boards. Two with Mesa 5i25s in them, and they *scream*.
One that is software stepping, that'll be repurposed shortly (beagleboard
with xylotex cape arrived yesterday - smiles all around)

Make sure:

1) hyperthreading is turned off in BIOS;
2) try the isolcpus bit - saves one core for the real time stuff.

http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2


should point you there.


Also, note that if you are using the parallel port, you might have an issue
that is easy to fix; Jon Elson posted, I took it and put it on my blog,

http://cnc-for-model-engineers.blogspot.ca/2013/01/intel-motherboards-and-parallel-port.html

Hopefully you can figure it out from that blog post, if not, ask.

Hope some of this helps -

John.


On Tue, Mar 31, 2015 at 6:58 PM, Neil emc_d...@narwani.org wrote:

 Peter,

 Yep, it's what I installed, on an Atom D525MW 1.8 Ghz.
 uname -a gives me 3.18.9-rt5 #1 SMP PREEMPT RT ...

 Cheers,
 -Neil.


 On 3/31/2015 5:03 PM, Peter C. Wallace wrote:
  Are you sure you are running the preemt-rt kernel?
 
  Preemt-rt has  pretty poor latency on Atom MBs (I think you said you
  had an Atom) but not 1.x ms bad
 
 
  http://freeby.mesanet.com/atom-330-preempt-rt.png
 
  i
 
  Peter Wallace
  Mesa Electronics
 
  (\__/)
  (='.'=) This is Bunny. Copy and paste bunny into your
  ()_() signature to help him gain world domination.
 
 
 



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Re: [Emc-users] Possible New Lathe

[John Alexander Stewart]

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] It's not an ORAC, but it should do...

[John Alexander Stewart]

Greg - just saw this email from you in my spam folder.

I've got a genuine Compact-8 waiting to be CNC'd - one of these years. Have
the 3 phase motor, VFD, the Mesa 5i25/7i76 got put in another vertical
mill, but that's easy to purchase.

I was thinking of using the feed screws but making acetal nuts using the
melt the plastic method.  I do read that this works fine, or sometimes
it's a bit tight. Maybe ball screws are the best way forward.

If you do proceed, tell me how you get along.

John.


On Sun, Mar 1, 2015 at 5:57 AM, Gregg Eshelman g_ala...@yahoo.com wrote:

 Picked up a JET 9x20 for only $50 last night. When did JET paint their
 stuff grey? I've only seen them green or off-white.

 Should make a decent base for CNC conversion, many 9x20's have been
 done. Should be able to make it at least as good as an ORAC since those
 are built on a Compact 8 clone and the 9x20 is a slightly larger copy.

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Re: [Emc-users] PathPilot (what hardware?)

[John Alexander Stewart]

Andy -


  the LinuxCNC community develops a case of PathPilot envy, someone will
  write an open source version.
 

 http://www.linuxcnc.org/index.php/english/forum/41-guis/26550-lathe-macros

 :-)


you have been elected to now do the same for Mills. :-)

John.
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Re: [Emc-users] half-assed cnc

[John Alexander Stewart]

Dave -

Thought about doing that, then thought why bother? it's a half-solution,
why not go the whole way and actually have a machine that can cut tapers,
threads, contours, etc...

(I measured up one of my lathes for a fellow called Graham Meek, who
publishes designs for (amongst other things) a threading gizmo clutch
thing. Beautiful work, intelligent designer. But, the lathe that I measured
was apart because it's slowly getting CNC'd - easier and more flexible than
the mechanical solution)

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

[John Alexander Stewart]

Dean;

Personally - my location makes my situation different than yours.

I have 3 CNC builds - two with Gecko 540s, one with Leadshine stepper
drivers ordered from China.

Ok - of the Gecko G540 machines; one is Mesa 5i25 driven, the other is
software stepping. The 5i25/G540 really works VERY well. It did take a bit
of asking questions to get the HAL files ok, but chalk that one up to
learning.

The Leadshine drivers (with Mesa 5i25/7i76) is very good. The stepper
motors are quiet, while the G540 driven steppers have a strange white
noise/humming on both machines when idle. This machine appears to be the
way to go.

I lost a G540 driver earlier this week; on the A axis on a lathe that had
only the X and Z axes wired in. Ie, there was no load on it, but it smoked
anyway. I don't know if I'll bother ordering a replacement driver module
for it.

The G540 has a max input voltage of something around 48v, while the
Leadshine drivers I got go up to, I believe, 80volts but check. If correct
it means you can keep your original power supply.

My location situation? Being in Canada, while I want to support my
brothers/sisters in the USA, it's cheaper to order in from China,
especially with the recent devaluation of the Canadian dollar.

You may find that the Leadshine stepper drivers are actually name-badged
from the old Keiling site - AutomationDirect, I think it is called now.

Hope this helps.
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Re: [Emc-users] Manual Mill Setup Question

[John Alexander Stewart]

I have no drill press now - just a couple of CNC'd mills - one with a quill.

What I do is I use my MPG to twiddle handles when moving manually. I can
control the spindle, zero DRO axes, etc all via the MPG.   This mill (with
quill) uses the XHC-HB04 MPG pendant, wired version, and it's great. I'm
thinking of CNCing my last manual mill...

Just my two cents (Canadian);

John.
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Re: [Emc-users] Gearchange comp

[John Alexander Stewart]

I have implemented Andy's lincurve example on my two speed geared mill.
Works very well!

Wrote it up at http://cnc-for-model-engineers.blogspot.com

Thanks Andy!  JohnS
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Re: [Emc-users] Possibly dumb question - 7i76 encoder for spindle speed feedback

[John Alexander Stewart]

Ok - I had an issue with the encoder scale - setting it to a fraction seems
to have helped.

It seems like I'm having lots of noise, though. Halscope on
hm2_5i25.encoder.00.input-a gives me a nice smooth signal, but reading a
spindle setting under about 500rpm gives me a reading of approx 500rpm or
more.

Pushing it through a limit2 seems to have smoothed the faster velocities.

Above, say, 800 rpm, the system tracks quite well; up to the max of
2250rpm. I can easily tell if the machine is in low or high gear, but only
when running at a requested speed of above 800 rpm.

I'm going to put the 6n138 on a small bit of pc board to reduce the long
leads, and see if that reduces the noise somewhat.

I am confused, though, that Halscope gives me a perfect signal, but the
encoder output is haywire. I guess I'm used to old-school scopes, either
digital or analog screens and with real probes and stuff...


On Tue, Dec 30, 2014 at 10:38 PM, Peter C. Wallace p...@mesanet.com wrote:

 On Tue, 30 Dec 2014, John Alexander Stewart wrote:

  Date: Tue, 30 Dec 2014 21:45:14 -0500
  From: John Alexander Stewart ivatt...@gmail.com
  Reply-To: Enhanced Machine Controller (EMC)
  emc-users@lists.sourceforge.net
  To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
 
  Subject: [Emc-users] Possibly dumb question - 7i76 encoder for spindle
 speed
  feedback
 
  Hi all;
 
  I'm back working on my mill with spindle tachometer, to utilize Andy
 Pugh's
  automatic spindle speed selector example code.
 
  I have, from the spindle sensor, input going to a 6N138 optoisolator's
  input. Ground and voltage source tied to machine. It sources enough
 current
  to drive the input quite well. (originally sent to the input of an Amtel
  processor in the LED spindle speed display)
 
  Output of 6N138, with +5v, ground, to the 7i76 ENCA+ and surrounding
  connectors on the 7i76.
 
  Looking with Halscope gives me a pretty good signal on
  hm2_5i25.0.encoder.00.input-a. Running at 1,000 rpm gives me 14 square
  teeth, running at 500 rpm gives me 7, and running at 300rpm gives me 4.
  (not that the counts mean much, except that the reading tracks spindle
  speed linearly)
 
  The 7i76 jumper is set for TTL input. ONLY the ENCA+ input pin has
 anything
  connected, the IDX, ENCB+/- and ENCA- are all left floating.
 
  The issue I have is that the velocity never seems to do much other than
  just futz around between 6 and 40, no matter what the spindle speed.
 
  Here's my ini code:
 
 setp hm2_5i25.0.encoder.00.counter-mode  1
 setp hm2_5i25.0.encoder.00.filter 1
 setp hm2_5i25.0.encoder.00.index-invert 0
 setp hm2_5i25.0.encoder.00.index-mask 0
 setp hm2_5i25.0.encoder.00.index-mask-invert 0
 setp hm2_5i25.0.encoder.00.latch-enable 0
 setp hm2_5i25.0.encoder.00.scale -16
 setp hm2_5i25.0.encoder.00.vel-timeout 1.0
 
  Should I tie the other encoder lines high/low or to somewhere?
 (especially
  the index pulse)
 
  Anybody with some advice?
 
  Thank you - John A. Stewart.

 If the inputs are jumpered for TTL levels you must leave the -inputs
 unconnected. The + inputs have 2K pullups to 5V so will be in a high state
 if
 left open. I forget the 7I76 encoder polarity but you may need to ground
 the
 ENCB+ input to get the count direction correct (ENCB is the direction
 input in
 count = COUNT/DIR mode )




 
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[Emc-users] Possibly dumb question - 7i76 encoder for spindle speed feedback

[John Alexander Stewart]

Hi all;

I'm back working on my mill with spindle tachometer, to utilize Andy Pugh's
automatic spindle speed selector example code.

I have, from the spindle sensor, input going to a 6N138 optoisolator's
input. Ground and voltage source tied to machine. It sources enough current
to drive the input quite well. (originally sent to the input of an Amtel
processor in the LED spindle speed display)

Output of 6N138, with +5v, ground, to the 7i76 ENCA+ and surrounding
connectors on the 7i76.

Looking with Halscope gives me a pretty good signal on
hm2_5i25.0.encoder.00.input-a. Running at 1,000 rpm gives me 14 square
teeth, running at 500 rpm gives me 7, and running at 300rpm gives me 4.
(not that the counts mean much, except that the reading tracks spindle
speed linearly)

The 7i76 jumper is set for TTL input. ONLY the ENCA+ input pin has anything
connected, the IDX, ENCB+/- and ENCA- are all left floating.

The issue I have is that the velocity never seems to do much other than
just futz around between 6 and 40, no matter what the spindle speed.

Here's my ini code:

setp hm2_5i25.0.encoder.00.counter-mode  1
setp hm2_5i25.0.encoder.00.filter 1
setp hm2_5i25.0.encoder.00.index-invert 0
setp hm2_5i25.0.encoder.00.index-mask 0
setp hm2_5i25.0.encoder.00.index-mask-invert 0
setp hm2_5i25.0.encoder.00.latch-enable 0
setp hm2_5i25.0.encoder.00.scale -16
setp hm2_5i25.0.encoder.00.vel-timeout 1.0

Should I tie the other encoder lines high/low or to somewhere? (especially
the index pulse)

Anybody with some advice?

Thank you - John A. Stewart.
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Re: [Emc-users] Limit Switches - 7i76

[John Alexander Stewart]

It's no problem, just tie them as the plans say (+field voltage, IIRC) and
set the correct level so that they trigger as expected.

I understand that the NC switches are better as they will open if there's
a wiring issue, but that's a minor item.

On Sun, Nov 23, 2014 at 7:46 PM, Jeremy Jones sp01jjo...@gmail.com wrote:

 I have a BP Boss knee mill. The switches are NO. How should I go about
 wiring this to the 7i76? Would it be better to get NC switches? Appreciate
 any help.

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Re: [Emc-users] Limit Switches - 7i76

[John Alexander Stewart]

Whoops - by correct level I mean, either use the signal as given, or use
the signal as -not to use it inverted. My hal files are not nearby, so I
can't tell you which version I used on my NC switches.

If you use pncconf, you'll be able to set whether the signal is inverted or
not. If you get it wrong, LinuxCNC will give you an error on startup,
saying that the limit switch on axis [0-n] is set.

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Re: [Emc-users] Question re using magnetics for work holding

[John Alexander Stewart]

Cleaning those strong magnets: I use Duct Tape for cleaning those strong
magnets.

You know the tape - tearable, silvery stuff that dries out if you use it to
tape over hot air ducts...

I use these magnets for all kinds of things - e.g. my large lathe has dial
indicators held on by magnets (via an intermediary bit of aluminium) and
they still work very well 15 years later... (I keep meaning to get a good
DRO for the lathe, but these dial indicators are just fine)

John
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Re: [Emc-users] Unable to get Nvidia Graphic Card working with nvidia drivers .

[John Alexander Stewart]

Alex;

I've made the isolcpu=1 modification but numbers are always pretty high
 (6-65000 on both threads) but more stable as I can see.


How many cores?  If two, the isolcpus=1 is correct; if four, or one or...
it may not be.

I modified Kent's 07_rtai script to find the pae kernels; someone else
(sorry, names
are in the script) went through and worked out different cores and what
worked well.
IIRC his/her comments are in the wiki page and in the 07_rtai script.

Just something to check; John.
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Re: [Emc-users] Machinekit and LinuxCNC

[John Alexander Stewart]

Hi Dave;

Thanks for the response; I don't think that its bleak at all. Like you, I
see continual improvement, and a great future.

Open Source: I did manage the largest and longest running open source
project in the Canadian Government. Million++ of downloads, distributed for
a while by Apple, used by NASA and CERN, etc, etc. But when it came time to
present work at a HTML5 yearly meeting, I presented a colleagues' work
(from Fraunhofer, in Germany) because that project made more sense for
integration with HTML5.

So, I fully expect that we will continue to see improvement and progress,
and adoption of the best of the ideas.

Regards - JohnS.
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[Emc-users] Machinekit and LinuxCNC

[John Alexander Stewart]

Can someone tell me what the eventual plans for Machinekit and LinuxCNC is?

Are the two forks going to come together again?

I really like LinuxCNC, and I really like the idea of small, embedded CNC
controllers, so I'm just wondering. (I have been loosely following the
machine kit google group; maybe the answer is obvious, but I've missed it)

Thanks - JohnS.
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Re: [Emc-users] Machinekit and LinuxCNC

[John Alexander Stewart]

Hmmm.

Reminds me of a company I worked for; two groups who could not talk. One
group (mine) was spending a pot of money (about a million bucks, 1980s
money) to keep an old computing system going, the other wanted to spend
that same pot of money on the next generation of computers.

I asked for, and got a desk in Group II's building; right in the midst of
Group II. First question I got asked by a very nervous Group II was what
the h*ll are you doing here?

My answer was Group 1 is trying to keep the engineers delivering code to
keep the lights on, and you are trying to progress the tools so that things
work better in the future.

Put that way, Group II realized that, hey, that makes sense - we can't
stop production for a year, and my old group knew that the old way was
increasingly not really cutting it, but we had to keep the lights on...
Within ONE DAY the conflict was over, and we all worked towards a common
goal.

Maybe not relevant, but there are a lot of really smart people here,
working away to make better environments, and each and every one has
something to contribute to the success of the code base.

Off to cook dinner - JohnS.

​
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[Emc-users] part 2 - Mach3 to LinuxCNC

[John Alexander Stewart]

I'm always interested to see how the younger set build things.

Quite often they use Mach3 - here's an example:
http://www.buildlog.net/sm_laser/drawings.html

Charles and Co. are doing great things with Machinekit and 3D printers,
but, how do we get the younger set to use LinuxCNC more?

I don't know the answers, but I keep pushing LinuxCNC in my own quiet way.

JohnS.
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Re: [Emc-users] gvcpDRO

[John Alexander Stewart]

Kirk;

Interesting - I did just sell my drill press, and am finishing up a G0704
mill conversion, and would like to run it with an MPG and a very simplified
screen.

You might have the building blocks there to do this... :-)

Thank you - John.
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Re: [Emc-users] open-source cam software thoughts and comments

[John Alexander Stewart]

Andy and others;

1) I run CamBam on my OSX machine - had to install a MONO framework, but it
works. (found the instructions in the cambam forum)

The latest Linux release of CamBam is great - it runs on Ubuntu 14.04
really well - the previous release had some MONO framework issues.

2) I did use dxf2gcode, but I do find CamBam much easier to use for more
complex 2D parts. So, I purchased CamBam. I do have some usage examples in
my blog for anyone interested - see below for URL.

3) I did some engraving by opening a jpg file in LinuxCNC - worked great!

4) I did write cylinder-triangle intersection tests for a 3D viewer that I
did (Open Source, even Apple distributed it for a while) and when run on
the GPU they run really fast - it would be great for 3D tool path
generation, but I'll let others do that.


I did put some stuff on my blog about engraving, but I can't give a
direct link to the posting, firewall issues... but the blog is
http://cnc-for-model-engineers.blogspot.com and it should be easy to find
as the engraving was done recently.

(the blog is focused towards those with less experience than those on this
email list, so do not expect nose-breaking technical algorithms, etc)

JohnS.
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Re: [Emc-users] How to machine....

[John Alexander Stewart]

Well done Andy.

With regards to your comment on the video about I don't think I have seen
another CNC horizontal miller.
I did see a Centec 2A CNC'd somewhere on-line, and I, too, have a
Horizontal miller that'll get done one of these years.

Certainly, you did a very good job of your conversion for your mill.

John.
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Re: [Emc-users] How to Migrate from Mach3 to LinuxCNC

[John Alexander Stewart]

Ah! But, was the author successful? (have to wait for my copy to arrive so
that I can find out!)

You (meaning, all of us) must remember that many people are either 1) low
on the computer knowledge scale, or 2) reluctant to change.

I think most/all of us here are able to think out of the box, but others
are not.

Windows still has a strangle hold on desktop computing, even though
Microsoft is nowhere to be seen in the mobile field. For the first time
since 1996, I'm getting a windows desktop at work; Microsoft still has a
stranglehold on corporate/government offices.

JohnS
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Re: [Emc-users] Another 5i25-7i76 question - spindle encoder this time.

[John Alexander Stewart]

Two great ideas - I'll be in my workshop after work to have a peek.

Thank you - John A. Stewart.
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Re: [Emc-users] Problem with 5i25 on D525MW

[John Alexander Stewart]

Andrew - I have 3 D525MWs, two with Mesa 5i25 cards. One's been in
operation for almost 2 years, the other is a new install that I'm
completing.

Not being an expert in this area, but I did purchase a small switching
supply for field power, (12v in my case) and I have another 5v one for
analogue spindle control.

When disconnected from your machine, what voltages do you see on the pc
power supply bus?

I wonder if the PC power supply is in trouble?  Can you test the 5i25
boards with a known good PSU, without the 5i25 cards?  It is a hassle, but
switching boards is a fairly quick operation, especially if only for
testing purposes.

JohnS.





On Thu, Oct 2, 2014 at 7:41 AM, Andrew pkm...@gmail.com wrote:

 Hello,

 I've been retrofitting an old lathe with LInuxCNC. An old 9-step
 electromagnetic gearbox was replaced with Toshiba VFS-11, old asyncronous
 servo motors got replaced with a couple of newer servos in position mode.
 Thus I use 5i25+7i76 on D525MW. First I successfully set up the VFD for
 manual 3 step gearbox, then I connected Z axis servo drive and it was
 jogging around pretty well.

 The next day I powered up the PC and Z servo drive (but not VFD), the PC
 started booting. I remember the boot log appearing and then suddenly the
 screen gets black. Since then no picture from that PC, even no bios logo. I
 checked the display, the PSU etc with no success.
 It looks like the D525MW is dead. Pretty frustrating.

 Here's the first question: could it burn because of some electromagnetic
 issues? I used 12V from PC for 7i76 field power (is it wrong?). The
 (chinese) servo drive was connected to STEP/DIR in differential mode. The
 servo drive is supplied directly from 220V, but it has opto-isolated enable
 input, I connected it to GND and one of the field outputs.

 Later I took another D525MW which had been used with 7i43 + 7i48. But
 somehow this D525MW doesn't see the 5i25 board. I get ... hm2_pci.ko: No
 such device error. lspci doesn't list 5i25. But the 5i25 lists on another
 PC and the config starts OK.

 The second question: what can be wrong with this D525MW?

 Thanks!

 --
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[Emc-users] Another 5i25-7i76 question - spindle encoder this time.

[John Alexander Stewart]

My 7i76 mill is working very well.

The last setup before I put everything in its place is to get Andy Pugh's
automatic spindle software gearing to work.

I have a spindle encoder, that is not-differential, and does not have an
index. 16 pulses per rev.

I have it wired such that the 3 jumpers (W4, W5, W6) are in the left hand
position (closest to the 25 pin connector), and a wire goes to the ENCA+,
TB3, pin 7. This should put it in TTL mode, with the pulse train going to
ENCA+.

Between pin 7 and pin 1 (gnd) when spinning the spindle manually, I get
between 0.8v and 5.65v on my digital voltmeter.

Input power, 7i76 manual, page 49, says Input Common Mode Range -7 to +12
volts. Input TTL threshold is 1.4 to 1.8v.

I HAVE NOT connected (or jumpered) any other input wires for this encoder -
they are left floating.

The encoder.00.counter-mode is set to 1
encoder.00.filter set to 1
encoder.00.index-invert set to 0, index-mask-invert to 0, latch-enable to 0
encoder.00.scale set to 16

I see nothing - no counts, no action on the input.

I also don't have much luck googling this stuff - maybe I need to practice
more.

Does the above look reasonable? Should I jumper the ENCB, IDX, lines
somewhere?

Yours confusingly,
John A. Stewart.
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Re: [Emc-users] PCD routine for ngcgui

[John Alexander Stewart]

Dave wrote:

Cool stuff! Now if I could only remember it when I need it. ;-)


My thoughts exactly!  Thanks Chris/Andy for bringing this enlightening
example to my day.


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Re: [Emc-users] 7i76 and spindle control

[John Alexander Stewart]

Andy, Gene - I do have a spare 12v linear regulated supply and a nice small
5v switching sitting by my new mill, was going to prototype with the 5v
first. (KBIC says 0-7v input in voltage follower mode - 0-5v will get me
going)

Interesting about the dc-dc converters; on reading, as Gene says, some are
isolated, some are not.

The local store does have lots of switching power supplies of varying
voltages, and I do have a large metal box for all of this to go into, but I
dislike clutter.

So, I'll see if the local store has a 12v 12v dc isolated  converter that
is small and compact.

I appreciate the isolation warnings; while I do realize that I'm playing
with 110v, 15A here, but it is nice to have the reminder, and also, for
others who may stumble across this thread.

Thank you!  JohnS
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[Emc-users] 7i76 and spindle control

[John Alexander Stewart]

I have a G0704 mill (known up here as a King Canada KC20-VS) that is
being CNC'd, with only one real issue cropping up.

The spindle speed  control - original is a 4.7k pot, the spindle circuit
board is a copy of a KBIC 120 style board.

With the 4.7K pot in place, I measure 4.14v across the outer leads. With it
removed, the circuit board shows about 11.9v. When I connect up to the
7i76, the voltage drops to 1.89v.  No matter what I do (not that I'm an
expert in this config) I can't get anything other than 0.0v out of the 7i76
spindle out.

Does the 7i76 draw more current (twice as much, approx) as a 4.7k
potentiometer?

If so, I might have an out:

The KBIC board allows for voltage following with an external 0-7v supply
leading to one of the  leads for the potentiometer, and one of the field
wiring connections; maybe this board will act the same.

Anyone know if what the 7i76 is doing is correct?

Thanks - JohnS.
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Re: [Emc-users] 7i76 and spindle control

[John Alexander Stewart]

Hi Peter;

Thanks for the response - I'll try that tomorrow.

My first mill (different manufacturer) was an easy replacement - no
external power required - so my mind was set in just do it the same mode.

So far, Chris Morley's pncconf is working well with your products - having
fun with this build.

John A. Stewart.
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