Siemens SINUMERIK 828D Programming Manual page 273

The appropriate gear stage for the programmed spindle speed
on the basis of the first gear-stage data record. The programmed drilling speed
output in the current gear stage and, if necessary, is limited to the maximum speed of the
gear stage. No automatic gear-stage change is possible following an
for an automatic change in gear stage to be performed, the spindle must be in speed-control
mode.
Note
If gear stage 2 is selected at a spindle speed of 800 rpm, then the switching thresholds for
the maximum and minimum speed must be configured in the relevant machine data of the
second gear-stage data record (see the examples below).
Example 3: Application of the second gear-stage data record
The switching thresholds of the second gear-stage data record for the maximum and
minimum speed are evaluated for
master spindle. Automatic
determined in the manner described above is compared with the active gear stage. If they
are found to be different, a gear-stage change is performed.
Program code
N05 M40 S500
...
N50 G331 S800
N55 SPOS=0
N60 G331 Z-10 K5
Example 4: No speed programming → monitoring of the gear stage
If no speed is programmed when using the second gear-stage data record with
the last speed programmed will be used to produce the thread. The gear stage does not
change. However, monitoring is performed in this case to check that the last speed
programmed is within the preset speed range (defined by the maximum and minimum speed
thresholds) for the active gear stage. If it is not, alarm 16748 is signaled.
Program code
N05 M40 S800
...
N55 SPOS=0
N60 G331 Z-10 K5
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
9.12 Tapping without compensating chuck (G331, G332)
/ and when programming an
G331 G332
gear-stage change must be active. The gear stage as
M40
Comment
; Gear stage 1 is selected.
; Master spindle with second gear-stage data record: Gear
stage 2 is selected.
; Align spindle.
; Tapping, spindle acceleration from second gear-stage data
record.
Comment
; Gear stage 1 is selected, the first gear-stage data record
is active.
; Monitoring of spindle speed 800 rpm with gear-stage data
record 2: Gear stage 2 should be active, alarm 16748 is
signaled.
Motion commands
with is determined
S500 M40
is
S800
operation. In order
SPOS
value for the active
S
, then
G331
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