Siemens SINUMERIK 840D Programming Manual page 244

Turning Cycles 03.96
4 4
4.7 Thread cutting – CYCLE97
Function
With this cycle you can machine cylindrical and
tapered outside and inside threads with constant
lead in longitudinal or face machining. Both single
threads and multiple threads can be cut. In multiple
thread cutting, the threads are cut one after the
other.
Infeed is automatic. You can select either constant
infeed per cut or constant cross-section of cut.
A right-hand or left-hand thread is determined by the
direction of rotation of the spindle programmed
before the cycle call.
Feedrate and spindle override both have no effect in
thread travel blocks.
A speed-controlled spindle with a position measuring
system is required to operate this cycle.
Sequence of operations
Position reached prior to cycle start:
The starting position is any position from which the
programmed thread starting point + arc-in section
can be approached without collision.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition