Siemens SINUMERIK 840D Programming Manual page 245

03.96
4
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 for 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 removed.
• This cut is repeated according to the number of
programmed noncuts.
• The total motion sequence is repeated for each
additional thread.
Description of parameters
PIT and MPIT (value and thread size)
The thread pitch is a paraxial value and entered
without a sign. If metric cylindrical threads are being
machined it is also possible to define the thread
pitch in parameter MPIT as a thread size (M3 to
M60). These two parameters should be used as
alternatives. If they contain conflicting values, the
cycle generates alarm 61001 "Thread pitch wrong"
and is aborted.
DM1 and DM2 (diameter)
This parameter is set to program the thread
diameter of the start and end points of the thread.
With an inside thread, this corresponds to the tap
hole diameter.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
4.7 Thread cutting – CYCLE97
X
FPL
ROP
Turning Cycles
4
PIT
SPL
APP
FAL
Z
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