Re: [CAD_CAM_EDM_DRO] Re: EMC and stepper driver

When you look at the step pulses with a good scope, you can see that
they are all there, just not evenly spaced.
Darrell
http://www.machinemaster.com

----- Original Message -----
From: "Wally K" <cnc4me@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Tuesday, October 31, 2000 2:30 PM
Subject: [CAD_CAM_EDM_DRO] Re: EMC and stepper driver


> Tim:
>
> Let me ask you this question then. When talking about EMC and
> driving steppers. Do people know for sure that the problem is
> unevenly spaced steps at the higher speeds, or are steps actually
> missing.
>
> And one more bonus question on EMC. I have seen talk about encoder
> feedback for steppers. Were i assume the encoders mount on the
> stepper. Is there a setup in EMC that allows use of the DRO freeware
> boards and using linear scales for absolute position. Assuming
> linear scales can be hooked up to these boards.
>
> Wally K.
>
>
>
>
> --- In CAD_CAM_EDM_DRO@egroups.com, Tim Goldstein <timg@k...> wrote:
> > I am afraid I don't know. There are some hardware and software
> issues that
> > other people are far more versed on than I and I think that
> processor speed
> > plays a role. Ultimately I found that with an AMD K6 and using
> steppermod I
> > have my G320 servo setup capable of going faster than I am
> comfortable with
> > and stopped trying to go faster at that point.
> >
> > Tim
> > [Denver, CO]
> >
> > > Tim:
> > >
> > > Thank you for the insitefull reply. You did a very good job of
> > > explaining why the servo has less problems with a pulse train
> then a
> > > stepper.
> > >
> > > I have one other question for you. You talked about 30,000 steps
> per
> > > second from emc to your servo system. Do you know what the upper
> > > limit is for steps per second that EMC will output.
> > >
> > > Wally K.
>
>
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