
B-63782EN/01 NC FUNCTIONS 9.SPINDLE SPEED FUNCTION
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9.5 CONSTANT SURFACE SPEED CONTROL (G96, G97)
Specify the surface speed (relative speed between the tool and
workpiece) following S. The spindle is rotated so that the surface speed
is constant regardless of the position of the tool.
r
Surface speed S = 2πrN
Spindle speed N
G96 : Constant surface speed control mode
G97 : Constant surface speed control cancel mode
G96 (constant surface speed control command) is a modal G code.
After a G96 command is specified, the program enters the constant
surface speed control mode (G96 mode) and specified S values are
assumed as a surface speed.
Axis of constant surface speed controlled is can selected by following
command.
G96Pα P0:Selected axis in parameter No.5844
P1:X axis, P2:Y axis, P3:Z axis, P4:U axis
P5:V axis, P6:W axis, P7:A axis, P8:B axis
P9:C axis
- Clamp of maximum spindle speed
With the specification of G92, the maximum spindle speed signal is
output.
G92S_;The maximum spindle speed (min
-1
) follows S.
In general, the output signal is used for spindle speed clamping so that
the maximum spindle speed is not exceeded during constant surface
speed control.
- Position coder-less feed per revolution and constant surface speed control
On a machine on which no position coder is installed, feed per
revolution is enabled assuming the specified spindle speed signals
RO0s to RO15s to be the spindle speed, even if constant surface speed
control is applied