
B-63943EN-1/02 11.SPINDLE SPEED FUNCTION
- 1399 -
- When rigid tapping mode is specified
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:
• Stop the spindle when it is rotating.
• Check that the spindle has stopped completely, then set the rigid
tapping signal RGTAP <G061#0> to on.
• 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).
• 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. Spindle
output is equivalent to the specification of S0. S_ is executed in a
G84/G74 (machining center system) or G84/G88 (lathe system block.)
The timing chart is shown in the chart indicating the execution of
G84/G74 or G84/G88.
- Execution of G84/G74 (machining center system) or G84/G88 (lathe system block)
When M29S_; is specified, S_ is read in, spindle output being
equivalent to the specification of S0;. S_ is output when G84/G74
(machining center system) or G84/G88 (lathe system block) is
executed. Thus, the processing described below is performed.
- When M-type gear selection is used
When using a machine that features multiple gear stages for use with
the spindle motor and spindle, and the newly programmed 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.