HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 422)

422 DIN programming
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Programming of full-surface machining
When programming a contour on the rear face, be sure to consider the
orientation of the XK axis (or X axis) and rotational direction of arcs.
Insofar as you use drilling and milling cycles, there are no special
aspects to rear-face machining, since these cycles refer to predefined
contours.
For rear-face machining with the basic commands G100 to G103 the
same conditions apply as for rear-face contours.
Turning operations: The expert programs for reclamping contain
converting and mirroring functions. The following principle applies for
rear-face machining (2nd setup):
 + direction: Goes away from the workpiece
 – direction: Goes toward the workpiece
 G2/G12: Circular arc clockwise
 G3/G13: Circular arc counterclockwise
Working without expert programs
If you do not use the expert programs or the converting and mirroring
functions, the following principle applies:
 + direction: Goes away from the spindle
 – direction: Goes toward the main spindle
 G2/G12: Circular arc clockwise
 G3/G13: Circular arc counterclockwise