Feedrate Control and Spindle Motion
7.11 Constant cutting rate (G96/G961/G962, G97/G971/G972, G973, LIMS, SCC[AX])
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
309
Example Y-axis assignment for face cutting with X axis
N10 G18 LIMS=3000 T1 D1
;Speed limitation at 3000 rpm
N20 G0 X100 Z200
N30 Z100
N40 G96 S20 M3
;Constant cutting rate 20 m/min, is
;dependent on X axis.
N50 G0 X80
N60 G01 F1.2 X34
;Face cutting in X at 1.2 mm/rev
N70 G0 G94 X100
N80 Z80
N100 T2 D1
N110 G96 S40 SCC[Y]
...
;Y axis is assigned to G96 and G96 is activated, can be achieved
in a
;single block. Constant cutting rate
;S40 m/min is dependent on Y axis.
N140 Y30
N150 G01 F1.2 Y=27
;Grooving in Y, feedrate F 1.2 mm/rev
N160 G97
;Constant cutting rate OFF
N170 G0 Y100
Adjust feedrate F
When G96 is active, G95 feedrate 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/G961is first selected in the parts 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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