Wes wrote:
Some machines my need G17, G18, G19 as plane select. Why I don't know, I would think that
could be infered by the two out of 3 xyz values with corresponding ijk values.
These select the plane of the arc. It needs this ONLY because
you can add a 3rd axis linear move to any arc to do helical
interpolation. It needs the G17, etc. to know which two axes
the arc is in, and which one is the additional linear axis.

Jon