Hi Mike,

I suspected it was, but posted anyway. I wondered if the approach of simultaneous equations (for arbitrary shapes which can be defined by an equation, such as circle, rectangle, ellipse, lines, parabola etc.) might be useful in the future. Anyway, glad you're sorted. Thanks for posting - it was an interesting puzzle!

I'm impressed you do some of this by hand. When I got started on CNC I went straight to AutoCAD > dxf > toolpath generation > CNC so have never had to do much gcode creation, other then tweaking a few existing codes.

Wobblybootie - panic not! Assuming you can draw stuff in CAD, I suspect you can cut anything you want without getting bogged down in maths. I think there is a contingency of users who not only enjoy making stuff, but also enjoy the ownership and general challenge of CNC in general. I'm trying to resist falling into this latter category, and using it as a means to an end, but I must admit that it is drawing me in dammit. . . .