Example: Gearbox Stage Cannot Be Changed, Gearbox Stage Monitoring; Example: Programming Without Spos - Siemens SINUMERIK 840D sl Programming Manual

2.9.11.6

Example: Gearbox stage cannot be changed, gearbox stage monitoring

If the spindle speed is programmed in addition to the geometry in the G331 block when using
the second gear-stage data block, if the speed is not within the preset speed range (defined by
the maximum and minimum speed thresholds) of the active gear stage, it will not be possible
to change gear stages, because the path motion of the spindle and the infeed axis (axes) would
not be retained.
As in the example above, the speed and gearbox stage are monitored in the G331 block and
alarm 16748 is signaled if necessary.
Program code
N05 M40 S500
...
N55 SPOS=0
N60 G331 Z-10 K5 S800
2.9.11.7

Example: Programming without SPOS

Program code
N05 M40 S500
...
N50 G331 S800
N60 G331 Z-10 K5
Thread interpolation for the spindle starts from the current position, which is determined by the
previously processed section of the part program, e.g. if the gear stage was changed.
Therefore, it might not be possible to remachine the thread.
Note
Please note that when machining with multiple spindles, the drill spindle also has to be the
master spindle. SETMS(<spindle number>) can be programmed to set the drill spindle as
the master spindle.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Comment
; Programmed spindle speed: 500 rpm =>
; Gearbox stage 1
; Position the spindle
; Tapping
; Gearbox stage cannot be changed,
; Monitoring the spindle speed, 800 rpm
; with gearbox stage data set 1: Gearbox stage 2
; should be active => Alarm 16748
Comment
; Programmed spindle speed: 500 rpm =>
; Gearbox stage 1 (20 to 1028 rpm)
; Master spindle: Gearbox stage 2 is selected
; Tapping
; Spindle acceleration from second gearbox stage data block 2
Fundamentals
2.9 Motion commands
243