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10 The Spindle Function
63
Fig. 10.2-1
10 The Spindle Function
10.1 Spindle Speed Command (code S)
With a number of max. five digits written at address S, the NC will give a code to the PLC.
Depending on the design of the given machine-tool, the PLC may interpret address S as a code or
as a data of revs/minute.
When a movement command and a spindle speed (S) are programmed in a given block, function S
will be issued during or after the motion command. The machine tool builder will define the way of
execution.
The speeds specified at address S are modal values. At the time of power-on, the control will
assume value S0. The spindle speed has a minimum and a maximum limit in each gear ratio range.
They are defined by the machine-tool builder in parameters and the control does not let the speed
outside of this range.
10.2 Programming of Constant Surface Speed Control
Constant surface speed control function can
only be used in case of infinitely variable speed
main drive. In this case the control can change
the spindle speed so that the tool speed is
constant relative to the surface of the
workpiece and is equal to the programmed
value.
The constant surface speed must be specified
in function of the input unit on the basis of the
table below:
Input unit Unit of constant surface speed
mm (G21 metric) m/min
inch (G20 inch) feet/min