The safe move on a turning machine is the Z axis, same as a milling machine. You move the carriage away from the chuck axially(+Z). If you moved the X axis with a drill buried in the work piece, you'd have a nasty situation. IOW...Safe_Z would be the same move for lathes or mills.
-Bob
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Goto Z's, is to make all axis goto zero. Goto Safe_z makes the Z
axis move to the clearance plane (Safe_Z). This will be renamed to
clearance Plane in the near future so that in Turn, it will make
sense when it makes the X move to that setting instead of the Z.
