RE: [CAD_CAM_EDM_DRO] Radius compensation - Z axis

I don't think the information exists in G-code to do spherical compensation. You
have to have information regarding the slope of the finished surface at right
angles to the cut path.
I suppose it is theoretically possible, or perhaps somewhat of a heuristic
exercise, to identify the successive parallel cut paths, and from these, derive
a crossways slope.

Depending on how fussy the G-code reader is and how flexible the CAD/CAM package
is, you might be able to express the side-slope along the path as a coordinate
on one of the aux axes (e.g. the W axis). This gives a method of passing on the
information, but you still need to teach the CAM package to generate it, and the
machine driver (or whatever is doing the offsetting) to understand it. A G-code
preprocessor might help here.

It would likely be easier to teach the CAM package to just generate the offset
path in the first place.

-Kevin Martin