
B–63523EN–1/03
5. AUTOMATIC OPERATION
661
Tapping retraction start signal RTNT
Spindle enable signal ENB
Rigid tapping signal RGTAP
Spindle excitation
Retract movement
When tapping retraction is stopped, spindle enable signal is set to 0, in the
same way as for ordinary rigid tapping. Therefore, perform the sequence
for canceling rigid tapping. The CNC also automatically enters the reset
state when tapping retraction is stopped.
Parameter setting allows a programmed G30 command to be used also to
draw out the tool. When the power is disconnected during rigid tapping
because of an accident such as a blackout, this function can draw out the
tapping tool from the workpiece if an absolute position detector is
provided for the servo axis.
When rigid tapping has been stopped as a result of an emergency stop or
a reset, or when the power has been disconnected during rigid tapping,
execute the command in the format shown below in MEM operation or
MDI operation. Then, based on the rigid tapping command information
in the machining program, the tool moves along the tapping axis to the
initial point or R point in synchronization with the spindle.
The rigid tapping retraction command is a one–shot command.
G30 P99 M29 S min
–1
;
The time chart for activation is the same as that of ordinary rigid tapping.
Since the G30 rigid tapping retraction command is a one–shot command,
the G80 command for canceling rigid tapping is not provided.
Therefore, the processing of canceling the rigid tapping signal RGTAP
<G061#0> in response to the tapping retraction completion signal RTPT
<F066#1> must be added to the time chart for terminating ordinary rigid
tapping.
When the G30 command is used to perform rigid tapping (bit 1 (RG3) of
parameter No. 5201 is set to 1), there are limitations as follows:
1. Rigid tapping retraction using input signal RTNT <G62#6> is not
allowed.
2. Be sure to set bit 0 (G84) of parameter No. 5200 to 0.
Time chart for stopping
tapping retraction
Rigid tapping retraction
by G30 command
D Specification method
D Time chart
D Limitations