RE: [CAD_CAM_EDM_DRO] G Code questions

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

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