Mpit And Pit (As Thread Size And As Value); Poss (Spindle Position) - Siemens SINUMERIK 840D Programming Manual

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MPIT and PIT (as thread size and as value)

The value for the thread pitch can either be defined as
the thread size (for metric threads between M3 and M48
only) or as a value (distance from one thread turn to the
next as a numerical value). The parameter not required
in each case is omitted from the call or assigned the
value zero.
Right or left threads are specified by the sign of the
pitch parameter:
• Positive value
• Negative value
If the two thread pitch parameters have conflicting
values, alarm 61001 "Thread pitch wrong"
is generated by the cycle and cycle execution is
aborted.

POSS (spindle position)

Before tapping starts in the cycle, oriented spindle stop
is performed with command SPOS and the spindle is
brought into position control.
You program the spindle position for this spindle stop
under POSS.
SST (speed)
Parameter SST contains the spindle speed for the
tapping block with G331.
SST1 (retraction speed)
Under SST1 you program the speed for the retraction
out of the thread hole in the hole with G332.
If this parameter is assigned the value zero, the
retraction movement is performed with the speed
programmed under SST.
Further notes
The direction of rotation is always reversed
automatically for tapping in cycle.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
→
right (like M3)
→
left (like M4)
Drilling Cycles and Drilling Patterns
2.1 Drilling cycles
2
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