Constant Cutting Rate (G96, G961, G97, G971, Lims) - Siemens SINUMERIK 840DE Programming Manual

Working with multiple spindles
5 spindles – master spindle plus 4 additional spindles – can be available in one channel at
the same time.
One of the spindles is defined in machine data as the master spindle. Special functions apply
to this spindle, such as thread cutting, tapping, revolutional feed, dwell time.
The numbers must be specified with the speed and the direction of rotation/spindle stop for
the other spindles, e.g., for a second spindle and actuated tool.
Example:
N10 S300 M3 S2=780 M2=4
Deactivate SETMS
By issuing SETMS without spindle parameter you can switchback to the master spindle
defined in the machine data.
Programmable switchover of master spindle, SETMS(n)
You can define any spindle as the master spindle with a command in the NC program.
Example:
N10 SETMS (2)
Note
The speed specified with S and M3, M4, M5 now apply.
7.13

Constant cutting rate (G96, G961, G97, G971, LIMS)

Function
When G96/G961 is active, the spindle speed – depending on the respective workpiece
diameter – is modified in order that the cutting rate S in m/min or ft/min remains constant at
the tool edge.
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Feedrate Control and Spindle Motion
7.13 Constant cutting rate (G96, G961, G97, G971, LIMS)
;Master spindle 300 rpm, U/min, clockwise,
;2nd spindle 780 rpm, counterclockwise
;SETMS must be located in a separate block,
;spindle 2 is now the master spindle
7-37