Siemens SINUMERIK 840D Programming Manual page 252

Turning Cycles
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4.8 Thread chaining – CYCLE98
Function
With this cycle you can produce several
concatenated cylindrical or tapered threads with a
constant lead in longitudinal or face machining, all of
which can have different thread leads.
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.
The cycle implements the following motion
sequence:
• Approach to the starting point determined by the
cycle at the beginning of the arc-in section for the
first thread with G0.
• Infeed to commence roughing according to the
infeed type defined under VARI.
• Thread cutting is repeated according to the
number of roughing cuts programmed.
• In the next cut with G33 the final machining
allowance is cut.
• This cut is repeated according to the number of
programmed noncuts.
• The total motion sequence is repeated for each
additional thread.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
03.96
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