RE: [CAD_CAM_EDM_DRO] Stepper Motor and Cable Shielding. Any tips?

Hi,

I also recommend you try your set-up with TurboCNC. I've built a step/dir to
phase converter for my CNC Taig Mill controller box. With TurboCNC I get
flawless operation, but when I use another program I have problems.

The other program works fine when moving a single axis. When I move multiple
axis the same distance an speed, things are also fine. Its when I move
multiple axis at different speeds (or distance) I run into trouble.

I find that some or all of the axis lock up. Its like the pulse train is not
constant enough. I haven't investigated the problem. I need to hook up the
logic analyser to find out what's going on.

My surprise is that with TurboCNC it works fine, otherwise I'd immediately
suspect my hardware.

Cheers,

Peter Homann
<mailto:peter.homann@...>
Work : +61 3 8530-7755
Adacel Technologies Ltd Fax : +61 3 9596-2960
250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 0421 601665
http://www.adacel.com.au Australian Software Engineering Excellence

> -----Original Message-----
> From: Myron Cherry [mailto:mcherry@...]
> Sent: Tuesday, 23 July 2002 1:00 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Stepper Motor and Cable Shielding. Any
> tips?
>
>
> I had a similar problem with Mauch's 5A board and DeskNC. I
> have changed to
> TurboCNC and adjusted the pulse width to get the best
> repeatibility. It
> tracks identically with the Shooting Star DRO and I am
> thrilled with that.
> TurboCNC is free from www.dakeng.com.
>
> Good luck.
> Myron
>
> ----- Original Message -----
> From: "Peter" <prenolds@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, July 22, 2002 10:14 AM
> Subject: Re: [CAD_CAM_EDM_DRO] Stepper Motor and Cable
> Shielding. Any tips?
>
>
> > Tom,
> >
> > One thing you might test is running VERY low accelerations.
> I have high
> > quality Sanyo-Denki NEMA42 steppers driven by G210 Geckos
> on my mill and
> > have consistently lost steps on long 3D programs with lots
> of contours
> > etc. I've tried microstepping, no micropstepping, long step pulses,
> > short step pulses etc. same problem. All my cables are
> shielded, things
> > are grounded etc. etc. still problems. I'm using
> Flashcut, but I also
> > tried Indexer LPT and G-Code Controller with the same
> result so I know
> > it isn't my controller.
> >
> > I recently tried running extremely low accelerations and the problem
> > almost completely went away. I still don'tunderstand why I'm losing
> > steps but as a result of my last test, I am currently in
> the process of
> > going from open loop steppers to closed loop servos
> (purchased off eBay)
> > and am (extremely) hopeful that this change will solve my
> problems. I
> > will post the results of my tests.
> >
> > The only other thing I might suggest you check is the power supply
> > wiring. If your PSU can't provide the peak currents your
> controller and
> > motor is drawing - that could also be a factor. Low
> current = low torque.
> >
> > Hope this helps.
> >
> > Cheers, Peter
> >
> >
> > kaynrc wrote:
> >
> > > In case you follow more groups than just this, I have also posted
> > > this in the Master5 group, with few replies thus far.
> > >
> > > I have a semi-sick stepper system, with Dan Mauch's 5
> amp boards and
> > > Master5 as the software so far. (I'd like to stay with
> that one). The
> > > motors are new, 521 oz-inch also from Camtronics.
> > >
> > > I lost lots of steps on a bench test, whether I add
> resistance to the
> > > motor shafts or not (by hand). So I am losing steps somewhere, no
> > > matter how I adjust the feedrates or pulses per inch etc.
> > >
> > > I'm starting to suspect RFI or EMI is important and hurting my
> > > system, even if there are other causes on top of that.
> > >
> > > Can someone point out any shielding tips with respect to:
> > >
> > > 1. The parallel port cable (I have already bought some shielded-
> > > twisted paired wires, so I'll be making a cable, but what about
> > > grounding? Ground at one end only, and to the computer
> casing????)
> > >
> > > 2. The motors. Do they give off a hailstorm of RFI from
> the wires?
> > >
> > > 3. The wires from the breakout board to driver boards.
> Shield these??
> > >
> > > 4. Ground my case which holds the 3 drivers? Grounded
> also to the PC
> > > casing??
> > >
> > > 5. Anything I may have missed or gotten totally wrong,
> feel free to
> > > add in. I have, by the way, done a search on shielding
> in this and
> > > other groups, and gotten a good beginning picture. But I
> don't feel
> > > that I have the full picture yet. OK, I'm slow !
> > >
> > > Thanks for any feedback. Tom.
> > >
> > >
> > > Addresses:
> > > FAQ: http://www.ktmarketing.com/faq.html
> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > >
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> > Addresses:
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> > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> >
> > OFF Topic POSTS: General Machining
> > If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if
> you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this as a
> sister site to the CCED group, as many of the same members
> are there, for OT
> subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
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> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com
> to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider
> this as a sister site to the CCED group, as many of the same
> members are there, for OT subjects, that are not allowed on
> the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
> POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
> EXCEPTIONS........
>
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