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10 The Spindle Function
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10.2.1Constant Surface Speed Control Command (G96, G97)
Command
G96 S
switches constant surface speed control function on. The constant surface speed must be specified
at address S in the unit of measure given in the above table.
Command
G97 S
cancels constant surface speed control. The desired spindle speed can be specified at address S (in
revs/min).
– In order to calculate constant surface speed the coordinate system must be set so that its zero
point coincides with the rotation axis.
– Constant surface speed control is effective only after the spindle is started by means of M3 or
M4.
– The value is modal even after its calculation has been canceled with the help of command G97.
After power on the default constant surface speed is determined by parameter CTSURFSP.
G96 S100 (100 m/min or 100 feet/min)
G97 S1500 (1500 revs/min)
G96 X260 (100 m/min or 100 feet/min)
– Constant surface speed calculation is also effective in state G94 (feed/min).
– If the constant surface speed control is canceled by means of command G97 and a new spindle
speed is not specified the last spindle speed gained in state G96 remains in effect.
G96 S100 (100m/min or 100 feet/min)
.
.
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G97 (Revolution belonging to resulting diameter X)
– In case of rapid traverse positioning (block G00) the constant surface speed is not calculated
continuously but the revolution belonging to the end-position will be calculated. This is
needed for the spindle speed to avoid unnecessary changes.
– In order to calculate constant surface speed the zero point of the axis, on the basis the spindle
speed is changed, must be set to the spindle rotation axis.
10.2.2 Constant Surface Speed Clamp (G92)
With the help of command
G92 S
the highest spindle speed enabled in case of constant surface speed control can be set. During
constant surface speed calculation the control clamps spindle speed to this value. In this case the unit
of S is rpm.
– After power on as well as if value S has not been clamped by means of command G92 the top
limit of spindle speed in case of constant surface speed control is the maximum value
enabled for the given gear range.
– The maximum revolution value is modal until a new one is programmed or until the control is
turned off.