Re: Cutting an arc help G2/G3?

George,

Sorry for not responding to this sooner. The radius of a 12" circle
is 6", the radius of an 11" circle is 5.5", so the difference would
give you a part 1/2" wide. Using a radius of 5" for the inner arc
will give you a part 1" wide.

I just saw your message about using a 3/4" endmill, I will redo the
g-code this evening and post it in place of what I put up last night.
I am at work now and don't have all the proper software tools on my
laptop to get it done for you here. Sorry for the delay, I should
have read my email when I got up this morning.

John Guenther
Sterling, Virginia

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "gglines1" <gglines@c...>
wrote:

> If the outer edge of the ring is 12" and the part is 1" wide,
> wouldn't the inner edge of the ring be an 11" circle?
>
> George
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Guenther"
> <j.guenther@v...> wrote:
> > George,
> >
> > By the way, if "2.5" long piece cut out of a 12" ring that is 1"
> wide" is
> > true, then you are talking about a 12" circle and a 10" circle if
> the part
> > really is 1" wide.
> >
> > John Guenther
> > 'Ye Olde Pen Maker'
> > Sterling, Virginia
> >
> > > -----Original Message-----
> > > From: gglines1 [mailto:gglines@c...]
> > > Sent: Tuesday, June 24, 2003 14:55 PM
> > > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > > Subject: [CAD_CAM_EDM_DRO] Cutting an arc help G2/G3?
> > >
> > >
> > > I have to cut a small workpiece with a curve. The workpiece
> will be
> > > 2.5 inches long, 1" wide and 1/2" thick. The long end of the
> > > rectangle needs to be cut in an arc to match a 12" circle, the
> > > shorter inside arc to match an 11" circle. Hard to describe,
> think
> > > of a 2.5" long piece cut out of a 12" ring that is 1" wide.
> > >
> > > Assuming I start with a workpiece that is a rectange 2.5" long
> by 1"
> > > wide, how would I program the arc cut? I can see programming a
> > > circle and letting the machine make a 12" revolution, but that
> would
> > > be really slow. I'm not sure how to program just the part of
> the arc
> > > that I need.
> > >
> > > Thanks,
> > >
> > > George
> > >
> > >
> > >
> > > (FYI: My controller software (Microkinetics Millmaster Pro)
> > > recognizes I and J parameters but not the R parameter with

G2/G3)

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