Siemens SINUMERIK 840D Programming Manual page 81

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03.96
09.01
_PTAB (evaluation of thread pitch PIT)
Parameter _PTAB determines the unit of measurement of the thread
pitch.
• 0=according to programmed system of units inch/metric
• 1=pitch in mm
• 2=pitch in thread starts per inch
• 3=pitch in inches/revolution
This parameter is needed in connection with the option for selecting
different thread tables in the cycles support.
_TECHNO (technological settings)
Parameter _TECHNO can be set to select technological
characteristics for tapping operations.
Possible values are:
Ones digit (exact stop behavior):
•
0=as programmed before cycle call
•
1=(G601)
•
2=(G602)
•
3=(G603)
Tens digit (feedforward control):
•
0=as programmed before cycle call
•
1=with feedforward control (FFWON)
•
2=without feedforward control (FFWOF)
Hundreds digit (acceleration):
•
0=as programmed before cycle call
•
1=soft acceleration of axes (SOFT)
•
2=brisk acceleration of axes (BRISK)
•
3=reduced acceleration of axes (DRIVE)
Thousands digit:
•
0=activate spindle mode again (with MCALL)
•
1=stay in position-control mode (with MCALL)
Deep hole tapping _VARI, _DAM, _VRT
Parameter _VARI can be set to select between simple
tapping (_VARI = 0) and deep hole tapping (_VARI ≠ 0).
In conjunction with deep hole tapping, it is possible to
choose between chip breakage (retraction by variable
distance from current drilling depth, parameter _VRT,
_VARI = 1) and stock removal (withdrawal from
reference plane _VARI = 2). These functions work
analogously to the normal deep hole drilling cycle
CYCLE83.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
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