Siemens SINUMERIK 840D Programming Manual page 255

03.96
4
NSP (starting point offset)
Under this parameter you can program the angular
value that defines the point of the first cut for the first
thread turn on the circumference on the turned part.
This value is a starting point offset. The parameter
can be assigned any value between 0.0001 and
+359.9999 degrees. If no starting point offset has
been entered or the parameter has been omitted
from the parameter list, the first thread automatically
starts at the zero degrees mark.
PP1, PP2 and PP3 (thread pitch)
With these parameters you determine the thread
pitch from the three sections of the thread chain.
The pitch value must be entered as a paraxial value
without a sign.
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
1
Outside
2
Inside
3
Outside
4
Inside
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
4.8 Thread chaining – CYCLE98
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
Turning Cycles
4
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