Feedrate Control and Spindle Motion
7.13 Constant cutting rate (G96, G961, G97, G971, LIMS)
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
7-39
Example of speed limitation for the master spindle
N10 SETMS (3)
N20 G96 S100 LIMS=2500 ;Speed limitation at 2500 rpm
Or
N60 G96 G90 X0 Z10 F8 S100
LIMS=444
;Max. speed of the master spindle is 444 rpm
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]=1500G
Adjust feedrate F
When G96 is active, G95 feed is automatically activated in mm/rev.
Caution
If G95 was not already active, you must specify a new feedrate F when you call G96 (e.g.,
convert F value from mm/min to mm/rev).
Activate constant cutting rate, G96/G961
When G96/G961 is first selected in the part program, a constant cutting rate must be entered
in m/min or ft/min, when the command is reselected, a new cutting rate may be entered.
Upper speed limit LIMS
If you machine a workpiece that varies greatly in diameter, it is advisable to specify a speed
limit for the spindle. This prevents excessively high speeds with small diameters. LIMS
functions as a speed limiter with G96/G961 and G97.
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