
PROGRAMMING
B–61404E/08
9. SPINDLE SPEED FUNCTION
(S FUNCTION)
104
To execute the constant surface speed control, it is necessary to set the
work coordinate system , and so the coordinate value at the center of the
rotary axis, for example, Z axis, (axis to which the constant surface speed
control applies) becomes zero.
X
Z
0
Fig. 9.3 (b) Example of the workpiece coordinate system for
constant surface speed control
G96 mode G97 mode
Specify the surface speed in m/min
(or feet/min)
G97 command
Store the surface speed in m/min
(or feet/min)
Command for
the spindle
speed
Specified
The specified
spindle speed
(rpm) is used
Not specified
The surface speed (m/min or
feet/min) is converted to the
spindle speed (rpm)
G96 command
The specified
surface
speed is used
Command
for the surface
speed
The stored surface speed (m/min or
feet/min) is used. If no surface speed is
stored, 0 is assumed.
Specified
Not specified
D Setting the workpiece
coordinate system for
constant surface speed
control
D Surface speed specified
in the G96 mode