I have a Chinese Mill that I converted to CNC from plans a few months ago. I'm very much at the bottom of a steep (to me) learning curve....

I want to create a toolpath that looks like this (the red line). Each square is .25" and each arc is essentially 1/4 of a circle.



(Center of the drawing is my 0,0 and each square represents .25 of a unit)

I am using Mach3 with the "Cut Arc" wizard to create 4 arc's and then combine the 4 to create one curve.

When I made each arc in the wizard they looked ok, and I ended up with this -

G3 X-0.125 Y0 I0 J0.375 F2
G2 X0 Y0.375 I0.375 J0 F2
G2 X0.375 Y0 I0 J-0.375 F2
G3 X0.5 Y-0.375 I0.375 J0 F2

Which unfortunatly leads to this in mach3 -



I have double checked my number's in the wizard and started over several times. I'm not familiar with g-code at all, but I know G3 does a CCW arc and G2 is CW the coordinate figures are not the same coordinates I entered into the wizard and I'm not at all familiar with I or J g-codes.

If someone could please explain what I'm doing wrong and point me in the right direction for how to do this correctly, or of a better method I'd greatly appreciate it.

Thanks