Fanuc Series 15i/150i-MA (Programming) Operators Manual

B-63324EN/03 PROGRAMMING 14.COMPENSATION FUNCTION
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There is no inner intersection
If the cutter compensation value is sufficiently small, the two circular
tool center paths made after compensation intersect at a position (P).
Intersection P may not occur if an excessively large value is specified
for cutter compensation.
When this is predicted, P/S alarm No0276 occurs at the end of the
previous block and the tool is stopped. In the example shown below,
tool center paths along arcs A and B intersect at P when a sufficiently
small value is specified for cutter compensation. If an excessively large
value is specified, this intersection does not occur.
- Change in the offset direction in the offset mode
The offset direction is decided by G codes (G41 and G42) for cutter
radius
and the sign of cutter compensation value as follows.
Sign of offset amount
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 center path of that block and the tool center path of a
preceding block. However, the change is not available in the start-up
block and the block following it.
P
r
r
When the cutter compensation value is small
Programmed path
Alarm occurs and the tod stops
Arc B
Arc A

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