B–63522EN/02
24. AUTOMATIC OPERATION
NC FUNCTION
333
When rigid tapping is stopped, either by an emergency stop or by a reset,
the tap may cut into the workpiece. The tap can subsequently be drawn
out by using a PMC signal. This function automatically stores
information relating to the tapping executed most recently. When a tap
return signal is input, only the rigid tapping cycle return operation is
executed, based on the stored information. The tap is pulled toward the
R point. When a return value a is set in a corresponding parameter, the
pulling distance can be increased by a.
L L
α
α
Initial point
2nd return
completion
point
1st return
completion
point
R point
Return
completion
point
Center of
tapping
Z point (α = 0) (when α is set)
Instead of signal input, a G30 command can be used to start rigid tapping
return. This is made possible by parameter setting.
G30 P99 M29 S_ ;
M29 : A parameter–set M code that specifies rigid tapping
S_ : Specify S used when rigid tapping is specified. (Optional)
NOTE
1 When use of G30 is selected, rigid tapping return cannot be
performed by signal input.
2 The rigid tapping return command is a one–shot command.
24.11
RIGID TAPPING
RETURN (M series)
M series
24.11.1
Rigid Tapping Return
by Specifying G30
Format