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.
> >
> >
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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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