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

B-63324EN/03 PROGRAMMING 9.SPINDLE SPEED FUNCTION (S FUNCTION)
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Limitation
- Constant surface speed control for threading
The constant surface speed control is also effective during threading.
If face threading or taper threading is performed in G96 mode, however,
the spindle speed changes, and tool feedrate also changes accordingly,
resulting in a change in the servo delay. This can produce an incorrect
thread pitch.

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