Siemens SINUMERIK 840Di sl Programming Manual page 309

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