Re: NIST EMC Software

----- Original Message -----
From: Dan Falck <dfalck@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Monday, May 17, 1999 6:18 PM
Subject: Re: [CAD_CAM_EDM_DRO] NIST EMC Software


> From: Dan Falck <dfalck@...>
>
> At 02:42 PM 5/17/99 -0700, you wrote:
> >From: "Dan Mauch" <dmauch@...>
> >
> >Will NIST ECM work with step and direction stepper systems using the
> >parallel port or must you have the servo to go card installed in a ISA
slot
> >I just bought Linux version 5.2 with the bug fix that you mentioned. I
need
> >to read the docs and then set up a machine this weekend.
> >Dan
> >-
> >
> >
>
> Dan,
> This is what Fred Proctor, from Nist, wrote on the EMC mailing list in
> reference to this same question:
>
> I just put some more documentation of the stepper motor setup on the EMC
> web page,
>
<http://www.isd.cme.nist.gov/projects/emc/emcsoft.html>http://www.isd.cme.n
> ist.gov/projects/emc/emcsoft.html
> Look at the Figure 1 for a short block diagram comparing servos with
> steppers, and the section "Setting up Stepper Motors" for how to do it.
> There's a pinout for the parallel port bits there also.
> It doesn't use encoders, and is therefore open-loop. Limit and home
> switches are looked at, but the limit on input bits means we've ganged
> the positive limits together, negative limits together, and homes
> together. This can be changed easily (in emc/src/emcmot/extsmmot.c) if
> you can get more bits either through a second parallel port card or by
> using bidirectional parallel ports that let you read C0-C3 as inputs.
> I will probably end up changing how the code runs bits to the steppers
> based on a better method used by John Storrs. I haven't done this yet,
> though. This won't change the pinouts or anything.
> Matt Shaver asked about outputting the stepper phases directly, instead
> of using step-and-direction bits as we do now. This should not be a
> problem, but I need the phase diagrams and also a setup to test on. I
> have a stepper test stand from Microkinetics. When Matt gets his stepper
> motor Bridgeport working, I could try phasing on that.
> > I would be interested in the archive version of the EMC list, so that I
> > might not bother you with things that you have probably answered over
and
> > over before.
> The mail list archive should be available to non-NISTers in the next few
> days.
> --Fred
>
>
>
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