Siemens SINUMERIK 840Di sl Programming Manual page 176

Motion commands
4.17 Tapping without compensating chuck (G331, G332)
Parameters
G331
G332
X Y Z
I
J
K
Note
Both functions G331/G332 are modal.
After G332 (retraction), the next thread can be tapped with G331.
Equipment required: position-controlled spindle with position measurement system.
The spindle must be prepared for tapping with SPOS/SPOSA. It does not work in axis
operation, but as position-controlled spindle, see section Feed control and spindle movement
"Position-controlled spindle operation"
Note
Machine manufacturer
A second gear-stage data record can be preset for two additional configurable switching
thresholds (maximum speed and minimum speed) via axis-specific machine data (this record
can differ from the first gear-stage data record and the speed switching thresholds in the two
records are regarded as completely separate). Please see the machine manufacturer's
specifications for further details.
Outputting the programmed drilling speed in the current gear stage
The programmed drilling speed, e.g., S800, is output in the current gear stage and, where
necessary, is limited to the maximum speed of the gear stage. No automatic gear-stage
change is possible following an SPOS operation. In order for an automatic M40-gear-stage
change to be performed, the spindle must be in speed-control mode.
The appropriate gear stage for M40 is determined on the basis of the first gear-stage data
record.
176
Tapping. Tapping is described by the drilling depth (end point of the
thread) and the lead.
Tapping retraction. This movement is described with the same lead as
the G331 movement. The reversal in the direction of the spindle is
performed automatically.
Drilling depth (end point) in a Cartesian coordinate Drilling in
X direction, thread lead I
Y direction, thread lead J
Z direction, thread lead K
Thread pitch in X direction
Thread lead in Y direction
Thread lead in Z direction
Value range of lead:
±0.001 to 2000.00 mm/revolution
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals