Gear Stage Change At Fixed Position - Siemens SINUMERIK 840D sl Function Manual

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4
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Figure 16-6
16.4.8

Gear stage change at fixed position

Application and advantages
Machine tools increasingly use standardized spindle drives, firstly to save technological dead
time on a gear stage change and secondly to gain the cost benefits of using standardized
components.
The "Gear stage change at fixed position" function supports the "directed gear stage change"
of load gearboxes that need to be activated in a different way than the NC. The gear stage
change can in this case only be performed at a defined spindle position. An oscillation
movement as required by conventional load gearboxes is thus no longer necessary.
Sequence for gear stage change at fixed position
The gear stage change at fixed position
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
NCK then retracts NST DB31, ... DBX82.3 (change gear), ends the oscillation, releases the next
part program block for processing, and accelerates the spindle to the new S value (S1300).
The internal feed disable is set if:
● The spindle gear stage change has been programmed via the part program and
● A processing block is activated (i.e. G0 is not active)
The internal feed disable is not set during a gear stage change from synchronized actions or in
the case of specifications via the PLC with FC 18.
Gear stage change with stationary spindle
S1: Spindles
16.4 Configurable gear adaptation
1257