Re: [CAD_CAM_EDM_DRO] Conversational Programming and NAMES- very long!

Jon, What you say may be true for servo but not for steppers. To make
steppers work properly we need something past the Linux box to create smooth
step pulses. The problem with EMC and steppers now is that the pulse train
is ragged and you reach a point at about 20 IPM where the jitter on the
pulse train exceeds the instantaneous move capability of the stepper motor
and it stalls.
Darrell

----- Original Message -----
From: Jon Elson <jmelson@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Sunday, May 03, 1998 8:52 PM
Subject: Re: [CAD_CAM_EDM_DRO] Conversational Programming and NAMES- very
long!


>
>
> Pete Jarman wrote:
>
> > Ron wrote:
> >
> > <The only way to make a decent CPNC system with a windows GUI is to
> > use a
> > <separate motion controller box to handle the real time stuff. We had
> > <some discussions here a few weeks ago about developing such a box,
> > but
> > <that died.
> >
> > Is there any way that the motion controller box could be an outdated
> > x86 PC
> > with an interface card running a real time programme under either DOS
> > or
> > linux? The software would handle incoming commands and report status
> > through
> > the serial port to the controlling PC running the GUI and the
> > conversational
> > programming software.
>
> Yes, in theory, a DOS program that makes no system calls, and has no TSR
> programs that
> might grab control away will be allowed to run unimpeded, and can
> achieve real time
> performance. The serial port might be a bit slow for this. But, if you
> are throwing Linux
> into the equation, who needs any extra computers? They just make
> debugging that much
> more of a hassle. If you will be using Linux, put everything on it, the
> real-time motion
> control will make sure it has adequate time to process the motion, and
> the rest is left
> to the user's various tasks. I do this now, and pretty fearlessly edit
> programs while the
> machine is running others. (The only problem is that while you are in
> another window,
> you lose keyoard and mouse focus to the machining task, so the only
> emergency
> control is the E-stop button, which is a bit drastic. Nothing like
> trying to switch focus
> with the mouse when a crash is 1/2 second away!)
>
> Jon
>
>
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