Re: Cutting an arc help G2/G3?

John,

You've nothing to apologize for, you've been fantastically helpful!

Thank you!

George


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John D. Guenther"
<j.guenther@v...> wrote:

> 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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