Hi Mike,

If the Y axis is slightly out, and it is difficult to level, then you could always bolt a piece of wood to the table, and run the cutter over it until it was levelled. This would then mean the PCB was flat relative to the cutter.

Also, in my earlier post#9 there was an error in the quadratic equation, although the approach is still valid.

By the way, can we help generate the Gcode for you? It would be a matter of minutes to draw in CAD and create the Gcode automatically. Do you know what post processor you are using on the Mac, and what it might be similar to on the PC? e.g. Mach3 etc. What are the dimensions and tool size?