I believe you don't need the J. All you need are two points on the
circle and a line known to contain the center. Take the two points and
draw a line through them. Draw a perpendicular line through the
midpoint. Where your I line intersects the perpendicular line is your
radius center. Now that you mention it, I have have called out both I
and J in my programs which I guess is erroneous. I suppose G2/3 uses the
first option it sees and ignores the rest?

On Tue, 2007-11-27 at 11:27 -0800, Dave Engvall wrote:
> Hi Matt,
> 
> I, J and K are not  modal as far as I can tell. I get bitten by this  
> one every-once-in-awhile.
> 
> Dave
> On Nov 27, 2007, at 10:58 AM, Matthew Glenn Shaver wrote:
> 
> > The interpreter manual says that, in a center format arc move (G2 or
> > G3), only one offset word (I, J, or K, whichever are appropriate to  
> > the
... snip
-- 
Kirk Wallace (California, USA
http://www.wallacecompany.com/machine_shop/ 
Hardinge HNC lathe
Bridgeport mill conversion pending
Zubal lathe conversion pending)


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