FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

The offset direction is decided by G codes (G41 and G42) for tool nose
radius and the sign of tool nose radius compensation value as follows.
Sign of offset value
G code
G41 Left side offset Right side offset
G42 Right side offset Left side offset
The offset direction can be changed in the offset mode. If the offset
direction is changed in a block, a vector is generated at the intersection
of the tool nose radius center path of that block and the tool nose radius
center path of a preceding block. However, the change is not available in
the start–up block and the block following it.
D Change in the offset
direction in the offset

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