
9.SPINDLE SPEED FUNCTION (S FUNCTION) PROGRAMMING B-63944EN/02
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Example
T
300 400 500 600 700 800 900
1000 1100
1200
1300 14001500
1050
1475
200
375
500
300
400
700
X
Z
1
2
3
4
N16
N16
N15
N15
N14
N14
N11
N11
100
675
600
Programmed path
Tool path after offset
Radius value
φ600
400
N8 G00 X1000.0Z1400.0 ;
N9 T33;
N11 X400.0Z1050.0;
N12 G50S3000 ; (Designation of max. spindle speed)
N13 G96S200 ; (Surface speed 200 m/min)
N14 G01 Z 700.0F1000 ;
N15 X600.0Z 400.0;
N16 Z_ ;
The CNC calculates the spindle speed which is proportional to the
specified surface speed at the position of the programmed coordinate
value on the X axis. This is not the value calculated according to the X
axis coordinate after offset when offset is valid. At the end point N15
in the example above, the speed at 600 dia. (Which is not the turret
center but the tool nose) is 200 m/min. If X axis coordinate value is
negative, the CNC uses the absolute value.