Siemens SINUMERIK 840DE Programming Manual page 288

Feedrate Control and Spindle Motion
7.13 Constant cutting rate (G96, G961, G97, G971, LIMS)
This increases the uniformity and thus the surface quality of turned parts, and also protects
the tool.
The LIMS command is used to specify a maximum speed limitation for the master spindle;
for machines with switchable master spindles, this can be extended to up to four limits, one
for each of the master spindles in the parts program. The speed limitation programmed with
G26 or specified via setting data cannot be exceeded with LIMS and activates an alarm if not
observed.
Programming
G96 S...
Or
G961
Or
G97
Or
G971
LIMS=value or LIMS[1]=value up to LIMS[4]=value in one block
Parameters
G96
G961=
S...
G97
G971=
LIMS=
LIMS[...]=
7-38
Activate constant cutting rate (as G95)
Activate constant cutting rate (as G94)
Cutting rate in m/min, always applies to master spindle
Range of values: The range of values for the cutting rate
S can be between 0.1 m/min ... 9999 9999.9 m/min. The
precision can be set in the machine data.
Note:At G70/G700: cutting rate is in feet/min.
Deactivate constant cutting rate (as G95)
Deactivate constant cutting rate (as G94)
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.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals