Re: EMC and stepper driver

Darrel:

Do you know how much variance there is in the stepper pulses and how
long it happens. or is this somthing that happens more or less
continuouslly when outputing high stepper rates.

Wally K.

--- In CAD_CAM_EDM_DRO@egroups.com, "Darrell" <dgehlsen@e...> wrote:
> 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@u...>
> 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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