B--63003EN--1/02
9. SPINDLE SPEED FUNCTION
833
When T--type gear selection is used, the PMC must determine whether
gear switching is to be performed, and subsequently perform gear
switching as required. For this purpose, each time a spindle--speed
function code is specified, the spindle--speed function code read signal
(SF) and spindle--speed function code signals (S00 to S31) must be output
to the PMC. The required parameter settings are described below.
M series: Set bit 5 (NSF) of parameter No. 3705 to 0 to output SF.
T series: Set bit 4 (EVS) of parameter No. 3705 to 1 to output SF.
In general, a block containing M29 (miscellaneous function for
preparation for rigid tapping) specifies S****,S**** being output when
a block containing G84 (G74)is executed. This meansthat gearswitching
is performed in the block specifying G84 (G74).
M29 (miscellaneous function for preparation for rigid tapping) and S****
specify rigid tapping mode. When M29 is accepted by the PMC, the
following processing must be performed:
D Stop the spindle when it is rotating.
D Check that the spindle has stopped completely, then set the rigid
tapping signal RGTAP <G061#0> to on.
D Activate the spindle motor. Activate the motor so that a positive speed
command rotates the spindle in the forward direction (CCW when
viewed from the -- side of the tapping axis).
D Return FIN at least 250 ms after activation.
NOTE
The condition “at least 250 ms after activation” results from
there being no way of checking the completion of spindle
motor activation. Therefore, this wait period serves as an
alternative. The time required for activation to be completed
varies with the spindle motor and amplifier. Therefore, this
value of 250 ms is given as a guideline only.
In an M29 block, S**** is not executed, merely being read in. S**** is
executed in a G84 block. Spindle output is equivalent to the specification
of S0.
The timing chart is shown in the chart indicating the execution of G84
(G74).
When M29S****; is specified, S**** is read in, spindle output being
equivalent to the specification of S0;. S**** is output when G84 (G74)
is executed. Thus, the processing described below is performed.
When using a machine that features multiple gear stages for use with the
spindle motor and spindle, and S**** is outside the previously selected
gear range, the spindle--speed function strobe signal SF <F007#2> and
gear selection signals (output) GR3O, GR2O, GR1O <F034#2, #1, #0>
are output to the PMC.
At this time, perform gear switching at the PMC.
T--type gear selectio n
method
Gear switching timing
When rigid tapping mode
is specified
Execution o f G84 (G74)
D When M--type gear
selection is used