
9.SPINDLE FUNCTION B-63783EN-1/01
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9.4 CONSTANT SURFACE SPEED CONTROL
General
When a surface speed (m/min or feet/min) is specified after an S code,
the spindle speed is controlled to keep the surface speed constant,
regardless of the position of the tool.
r
Surface speed S = 2πrN
Spindle speed N
Specify constant surface speed control, as follows:
G96 S_ (surface speed in m/min (metric input)
or in feet/min (inch input))
To cancel constant surface speed control, specify the following:
G97 S_ (spindle speed in min
-1
)
During constant surface speed control, the spindle speed is calculated
so that the surface speed is held constant, and the calculation result is
output to spindle speed command signal RO0s to RO15s.
When the following command is specified, the maximum spindle speed
is output to the maximum spindle speed signal MR0s to MR15s:
G92 S_ (maximum spindle speed in min
-1
)
During constant surface speed control using the maximum spindle
speed signal, the spindle speed must be clamped so as not to exceed the
maximum spindle speed.
- Position coderless feed per revolution and constant surface speed control
When a machine with no position coder is used, a feed per revolution is
enabled assuming the value indicated by the spindle speed command
signal RO0s to RO15s to be the spindle speed, even during constant
surface speed control.