Re: Can CNCPro users provide some input? - cutter comp

Hi Tom,

comments interspersed below:

I haven't been through ALL the material I've downloaded yet (that seems
to happen quite often), but I'm trying!

Hope this fits your needs.

Alan KM6VV
P.S. Thanks again to the EMC guys!


Tom Eldredge wrote:

>
> Alan,
>
> I am trying to follow your tracks a little here...
>
> You went to the sourceforge (EMC) and selected the file entitled:
> emc-1.1-19.i386-win32.zip. Is that right?

Yes a 4 MB file. It is not the complete runtime, Ray says:

"The emc zip is a MS version that only simulates a machine controller.
It's
good for a look. The source files would be labeled as ???src.tgz"

I didn't think it took that long, 10-20 min?

>
> Where is the handbook you mentioned? Which file is it?

The handbook is apparently not a single file, like NIST. You can
print/download "pieces" of it (HTML?) at:

http://www.linuxcnc.org/handbook/index.html

I just printed out all of the pieces I could find. Probing would have
been interesting :>( and I think the NIST link might be broke. The
NIST has quite a lot of good information to study. I'm just in a study
phase now.

>
> I started to download the zip file... There is no way I can get the whole
> thing downloaded during the day. I use a free local server that only leaves
> me on for about 30 min. at a time except after midnight. So, I can't afford
> to download something big, unless I know it is exactly what I need. That is
> why I am checking before I download it.
>
> Thanks,
>
> Tom Eldredge
>
> ----- Original Message -----
> From: Alan Marconett KM6VV <KM6VV@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, March 21, 2001 2:57 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Can CNCPro users provide some input? - cutter
> comp
>
> > Hi Ray,
> >
> > Eureka! Home at last! I finally got to a download site I could USE!
> >
> > http://sourceforge.net/projects/emc/
> >
> > FINALLY a .ZIP file I can handle! Lotsa 'C' code here! Thanks for
> > these URL's. I didn't quite find the page (HTML?) on comp at:
> >
> > http://www.linuxcnc.org/handbook/index.html
> >
> > but I'll be downloading the handbook, and reading it from cover to
> > cover.
> >
> > Ray wrote:
> > >
> > > Alan
> > >
> > > There is a page on LinuxCnc.org about the way the EMC does comp. Jon E
> > > also has a page on his wusl site.
> > >
> > > There are several ways, including arcs, that you can approach the comp
> > > offset. I did some experiments while writing the handbook comp page and
> > > found that if you know the offset and the start of cut position in
> advance
> > > of the g42/43, or compute it some way, and use that info to move to the
> > > start position, you can begin comp right where you want to cut. The
> only
> > > thing that the EMC cares about is that you not gouge the surface that
> you
> > > are comping away from during the approach. It computes a possible
> > > gouge to some incredible degree of accuracy so the start position math
> has
> > > to be good.
> > >
> > > From: Alan Marconett KM6VV <KM6VV@...>
> > >
> > > <s>I've heard that the controller must have straight line enter and
> exits,
> > > >to give it time to switch into/out of comp. I really haven't much of
> an
> > > >Idea how it works, although I can see it simply as an offset in the
> CAD.
> > > >I'd like to hear/understand more about it.
> > >
> > > If you read a bit of c c++ you can look at the source code that Tom
> Kramer
> > > wrote for the emc. These routines are very well documented.
> > >
> > > Ray
> >
> >
> > I write C, C++ for work (and my own efforts), and I have been anxious to
> > study EMC, I just don't have Linux the experience, as yet! ;>)
> >
> > Thanks again for the URL's, I'd been to Source Forge (I thought) before,
> > and EMC sites, but these are DEFINITELY good sources.
> >
> > Alan KM6VV
> >
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