Re: [CAD_CAM_EDM_DRO] G Code questions

Hi Ethan,

Thanks for the explanation! Very visual. And the part is on a rotary
table rotating in Z axis? Yes! not a simple cut. You deepen the cut
into the work by moving in X.

Assuming I've finally got it, then one could write code to cut one
*ARC*, follow cut with an X move to deepen the cut. Make six copies of
this. Then add a rotate table. Now copy the entire cuts/rotate six
times for six "tracks". (assumes tool retract and return after each
individual cut). This would simplify SOME of the work (as you probably
know/done already!), if subroutines are not available.

Much of this can be done by the CAD (draw the 6 deeper arc's, connect in
Z), then copy 6 times for 6 tracks, and manually put in 6 table rotates
between the tracks.

Interesting piece!

HTH!

Alan KM6VV


Ethan Vos wrote:

>
> Think of six tracks on the inside of a wine glass running the same direction as the stem.
>
> Actually the tracks are cut X and Z with a rotation around Y with a horizontal tool along the Y axis instead of a vertical Z axis tool.
>
> Ethan
>
> -----Original Message-----
> From: Alan Marconett KM6VV [SMTP:KM6VV@...]
> Sent: Thursday, August 09, 2001 3:31 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] G Code questions
>
> Hi Ethan,
>
> I'm a little lost trying to visualize your part! 6 arcs, sounds like 6
> scallops into a round part? Like a knob? But you need to change the
> length of the arc? With CNC, you shouldn't have to rotate the part
> around Z! I guess I'd need to see a pix or DXF of the part.
>
> I've been told that EMC doesn't do subroutines, so your best bet is just
> to duplicate the arcs by hand. Tedious by hand, not to bad with a
> CAD/CAM program.
>
> Generate a DXF of the cuts, and Yeager's ACE can covert to Gcode for
> you.
>
> As far as programming start angle, end angle, radius and center point
> (0,0), I'd let the CAD work from these, and the required arc start and
> end points. Much easier IMO!
>
> HTH!
>
> Alan KM6VV
>
> Ethan Vos wrote:
> >
> > It's the same arc done over 6 times, then rotate the part 60 degrees around
> > the Z axis and do another arc 6 times. I do need the radius to change as
> > the cutter increments .003 so shifting the Z axis won't work. I'm using a
> > ball shaped cutter.
> >
> > Where can I find a sample of a sub-routine program that will run on EMC? I
> > can't find any documentation that shows the proper way to do this.
> >
> > Thanks.
> >
> > Ethan
> >
> > -----Original Message-----
> > From: Alan Marconett KM6VV [SMTP:KM6VV@...]
> > Sent: Thursday, August 09, 2001 1:31 PM
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Subject: Re: [CAD_CAM_EDM_DRO] G Code questions
> >
> > Hi Ethan,
> >
> > Sounds like you might be programming by hand? I don't know what your
> > part looks like, but I take a stab at your question. Are your arcs
> > connected together, possibly with linear sections, such that there is a
> > "contour" or continuous (more or less) path around/through all of them?
> > I'd suggest putting one "contour" in a subroutine, called 6 times;
> > dropping Z by .003 each time.
> >
> > Sounds like you've come to the right place to me!
> >
> > Alan KM6VV
> >
> > Ethan Vos wrote:
> > >
> > > I need to cut and arc of about 55 degrees with 4 or 6 passes of .003
> > each.
> > > There are six of these arcs per part, so 36 passes.
> > >
> > > Is there a repetitive cycle that will do arcs?
> > >
> > > If not, I think it would be possible to redo the same arc 6 times, but
> > > decrease the tool radius compensation by .003 to get the desired result.
> > Is
> > > there any way to do this with sub-programs and counters rather than
> > writing
> > > the same code 36 times?
> > >
> > > Can I program using start angle, end angle, radius and center point (0,0)
> > > rather than end points? I have the angles but not the positions and I
> > want
> > > to fool with the angles. It would be a lot more complicated for me to use
> > > end points because of all the extra calculations.
> > >
> > > And last, but not least, is this the proper forum for these questions, or
> > > is there another list I should belong to?
> > >
> > > Thanks.
> > >
> > > Ethan