Siemens SINUMERIK 840Di sl Programming Manual page 308

Feedrate Control and Spindle Motion
7.11 Constant cutting rate (G96/G961/G962, G97/G971/G972, G973, LIMS, SCC[AX])
G971=
G972=
G973=
LIMS=
LIMS[1 to 4]=value
SCC[axis]
Value
Axis
Example of speed limitation for the master spindle
N10 SETMS (3)
N20 G96 S100 LIMS=2500
or
N60 G96 G90 X0 Z10 F8 S100
LIMS=444
Example of speed limitation for up to four spindles
Speed limitations are defined for spindle 1 (supposed master spindle) and spindles 2, 3 and
4:
N10 LIMS=300 LIMS[2]=450 LIMS[3]=800 LIMS[4]=1500
308
Deactivate constant cutting rate with feedrate type as with G94 (linear
feedrate in relation to a linear/rotary axis).
Deactivate constant cutting rate with feedrate type as with G94 or
G95.
Deactivate constant cutting rate without activating speed limiting.
The speed limitation is active if G96, G961 and G97 are active for the
master spindle (LIMS does not work with G971). LIMS applies to the
master spindle.
Limitations of differing values can be programmed for up to four
spindles within one block. Unless expansion is specified, LIMS will
only remain effective for one master spindle.
Selective assignment of specified axis to G96/G961/G962
Spindle speed limitation in RPM
A reference axis is permitted to take the form of a geometry, channel
or machine axis, otherwise alarm 14850 will be signaled.
;Speed limitation at 2500 rpm
;Max. speed of the master spindle is 444 rpm
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals