HEIDENHAIN TNC 640 (34059x-02) Cycle programming - Manual (Page 336)

Cycles: Turning
13.17 RADIAL RECESSING EXTENDED
(Cycle 842, DIN/ISO: G842)
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TNC 640 | User's Manual Cycle Programming | 5/2013
Machining direction Q507: Cutting direction:
0 : bidirectional (in both directions)
1 : unidirectional (in contour direction)
Offset width Q508: Reduction of cutting length.
After clearance roughing, the remaining material
is removed with a single cut. If required, the TNC
limits the programmed offset width.
Turning depth compensation Q509: Depending
on factors such as workpiece material or feed rate,
the tool tip is displaced during a turning operation.
You can correct the resulting infeed error with the
turning depth compensation factor.