Siemens Sinumerik 840D sl Programming Manual page 90

Spindle motion
7.3 Constant cutting rate (G96/G961/G962, G97/G971/G972, G973, LIMS, SCC)
Note
The reference axis for G96/G961/G962 must be a geometry axis assigned to the channel at
the time when SCC[<axis>] is programmed. SCC[<axis>] can also be programmed when
any of the G96/G961/G962 functions are active.
Examples
Example 1: Activating the constant cutting rate with speed limitation
Program code
N10 SETMS (3)
N20 G96 S100 LIMS=2500
...
N60 G96 G90 X0 Z10 F8 S100 LIMS=444
Example 2: Defining speed limitation for four spindles
Speed limitations are defined for spindle 1 (master spindle) and spindles 2, 3, and 4:
Program code
N10 LIMS=300 LIMS[2]=450 LIMS[3]=800
LIMS[4]=1500
...
Example 3: Y-axis assignment for face cutting with X axis
Program code
N10 G18 LIMS=3000 T1 D1
N20 G0 X100 Z200
N30 Z100
N40 G96 S20 M3
N50 G0 X80
N60 G1 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
90
Comment
; Constant cutting rate = 100 m/min,
max. speed = 2,500 rpm
; Max. speed = 444 rpm
Comment
; Speed limitation at 3000 rpm
; Constant cutting rate = 20 m/min, is dependent upon
X axis.
; Face cutting in X at 1.2 mm/revolution.
; Y axis is assigned to G96 and G96 is activated (can
be achieved in a single block). Constant cutting rate
= 40 m/min, is dependent upon X axis.
; Plunge-cutting in Y, feedrate F = 1.2 mm/revolution.
; Constant cutting rate off.
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals