HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 346)

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Full-surface machining with opposing spindle
G30: The expert program activates the mirroring of the Z axis and the
conversion of the arcs (G2, G3, ..). The arcs must be converted for
turning operations and operations with the C axis.
G121: The expert program shifts the contour and mirrors the
coordinate system (Z axis). Further programming of G121 is normally
not required for machining the rear face after rechucking.
Example: The workpiece is machined on the front face, transferred to
the opposing spindle through an expert program and machined on the
rear face (see illustrations).
The expert program is used for:
„ Angle-synchronous workpiece transfer to the opposing spindle
„ Mirroring traverse paths in the Z axis
„ Activating a conversion list
„ Mirroring the contour description and shifting for the 2nd chucking
The mirroring/conversion function for rear-face machining (expert
program), is switched off at program end with the G30 command.