RE: Steppers

I started with half stepping drivers, 1150 in.lb. 200 cog motors and 2:1
reduction on 5TPI ballscrews. This gave a resolution of 4000 pulses per
inch (.00025). Unfortunately, resonance was so bad the motors would not
track. Vibration at some frequencies would vibrate a screwdriver off the
table of the machine (brand new Supermax YCM-40).

I switched to microstepping drivers. Wanting to keep rapid speeds as fast
as possible, I started with 1/5 stepping with the intention of going up from
there. The difference between 1/2 stepping and 1/5 stepping was hard to
believe. The motors don't even sound like steppers.

The Microkinetics software/board does not support ramping in jog mode, so I
switched to cncpro. With a 486DX4 I can get feeds of 40 in/min and never
loose a step. Rapid and jog work fine at 50 in/min. I have tried 75 in/min
but found the 486 a little anemic for the task. Based on Doug Yeager's
data, I should be able to at least double the rapid rate with a Pentium.

Microstepping drivers are definitely worth the extra money, IMHO.

Doug

> -----Original Message-----
> From: Bob Campbell [SMTP:bob@...]
> Sent: Thursday, January 20, 2000 3:46 PM
> To: CAD_CAM_EDM_DRO@onelist.com
> Subject: Re: [CAD_CAM_EDM_DRO] Steppers
>
> From: "Bob Campbell" <bob@...>
>
> Charles,
>
> The only problem with micro stepping drivers for use on cnc routers is
> that
> we soon start to max. out the cnc controller. I will be using micro
> stepping drivers on my new cnc router. I will have it set to 1,000 pulses
> per rev. and the lead screw will have four turns per inch. This gives me
> 4,000 pulses per inch or 0.00025 inches per pulse.
>
> I expect to still get about 200 inches per minute using cncpro.
>
> Bob Campbell
> ----- Original Message -----
> From: Charles Hopkins <chopkins@...>
> To: <CAD_CAM_EDM_DRO@onelist.com>; 'Jon Elson' <jmelson@...>
> Sent: Thursday, January 20, 2000 9:34 AM
> Subject: RE: [CAD_CAM_EDM_DRO] Steppers
>
>
> > From: Charles Hopkins <chopkins@...>
> >
> >
> > Jon wrote
> >
> > The only possible consideration is that you might want
> > finer resolution than the steppers are set up to provide. A lot of the
> stepper driven machines
> > have resolution of .001" / step.
> >
> > This is exactly what I have.
> > Can I use a micro stepping driver and get this to a .000125" resolution?
> >
> > Charles Hopkins
> >
> >
> >
> >
> > --------------------------- ONElist Sponsor ----------------------------
> >
> > GRAB THE GATOR! FREE SOFTWARE DOES ALL THE TYPING FOR YOU!
> > Tired of filling out forms and remembering passwords? Gator fills in
> > forms and passwords with just one click! Comes with $50 in free coupons!
> > <a href=" http://clickme.onelist.com/ad/gator4 ">Click Here</a>
> >
> > ------------------------------------------------------------------------
> >
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
> > To Unsubscribe, read archives, change to or from digest.
> > Go to: http://www.onelist.com/isregistered.cgi
> > Log on, and you will go to Member Center, and you can make changes
> there.
> > For the FAQ, go to http://www.ktmarketing.com/faq.html
> > bill,
> > List Manager
> >
> >
> >
> > --------------------------- ONElist Sponsor ----------------------------
> >
> > GRAB THE GATOR! FREE SOFTWARE DOES ALL THE TYPING FOR YOU!
> > Tired of filling out forms and remembering passwords? Gator fills in
> > forms and passwords with just one click! Comes with $50 in free coupons!
> > <a href=" http://clickme.onelist.com/ad/gator4 ">Click Here</a>
> >
> > ------------------------------------------------------------------------
> >
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
> > To Unsubscribe, read archives, change to or from digest.
> > Go to: http://www.onelist.com/isregistered.cgi
> > Log on, and you will go to Member Center, and you can make changes
> there.
> > For the FAQ, go to http://www.ktmarketing.com/faq.html
> > bill,
> > List Manager
>
>
> --------------------------- ONElist Sponsor ----------------------------
>
> GRAB THE GATOR! FREE SOFTWARE DOES ALL THE TYPING FOR YOU!
> Tired of filling out forms and remembering passwords? Gator fills in
> forms and passwords with just one click! Comes with $50 in free coupons!
> <a href=" http://clickme.onelist.com/ad/gator4 ">Click Here</a>
>
> ------------------------------------------------------------------------
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
> discussion of shop built systems in the above catagories.
> To Unsubscribe, read archives, change to or from digest.
> Go to: http://www.onelist.com/isregistered.cgi
> Log on, and you will go to Member Center, and you can make changes there.
> For the FAQ, go to http://www.ktmarketing.com/faq.html
> bill,
> List Manager