I have an Arrow 500 with CT controller. I have no training in CNC - jst thought I'd buy one and have a play for kicks. I'm using an old version of visual mill to process my files. Many of my circles were coming out as polygons which to me is not really what I want.

I found a setting in VM to change so it doesnt make a circle out of a bunch of lines and treats it as a circle - sweet!

However it doesnt work on my machine, it's giving an error of - end point of circle not on circumference.

the code goes something like this:

G0 X-8.732 Y-26.234 Z1.25 M08
G1 Z-0.2
G17
G3X-13.995Y-19.577I-14.691J-25.537 F150.
G1 X-14.183 Y-19.555

From what I figure - the start point of the arc is X-8.732 Y-26.234, the end point of the arc is X-13.995 Y-19.577
this is the bit where i get stuck ....
The center of the arc is -8.732+-13.995 = X-22.727
and -26.234+-25.537 = Y-51.771????

Is that pretty much it? Ill have to draw it out on some graph paper to make sense of it.

Whos wrong - visual mill, the CT controller or me? I woulda thort a computer figuring that sorta thing out should get it right - is it jst the syntax thats wrong??