Siemens SINUMERIK 840D Programming Manual page 313

4
03.96
VARI (machining type)
With parameter VARI, you define if machining is to
be internal or external and with which technology the
infeed will be machined during roughing. The
parameter VARI can be one of the values between 1
and 4 with the following meaning:
Value Outside/inside
Outside
1
Inside
2
Outside
3
Inside
4
If another value has been programmed for
parameter VARI, the cycle is aborted after alarm
61002 "Machining type incorrectly defined" is output.
NUMT (number of thread starts)
With parameter NUMT you specify the number of
thread starts for a multiple thread. If you require a
single thread, either assign the value zero to the
parameter or omit it from the parameter list.
The thread starts are distributed uniformly around the
circumference of the turned part, the first thread is
defined in parameter NSP.
If a multiple-start thread with a non-uniform distribution
of threads around the circumference is to be machined,
the cycle must be called for every thread start and the
corresponding starting point offset must be
programmed.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
4.7 Thread cutting – CYCLE97
Infeed with constant
infeed depth
Infeed with constant
cross-section of cut
Const. infeed/const. cross-section of cut
Constant infeed
Constant infeed
Constant cross-section of cut
Constant cross-section of cut
0 degree mark
Start
1st thread
NSP
Start
2nd thread
4
Turning Cycles
Start
4th thread
Start
3rd thread
NUMTH = 4
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