
5.AUTOMATIC OPERATION B-63943EN-1/02
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5.9 RETRACTION FOR RIGID TAPPING
Overview
When rigid tapping is stopped, either as a result of an emergency stop
or 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 retraction signal is input, the tap is removed from
the hole, based on the stored information. The tap is pulled toward the
R point. When a retract value α is set in parameter No. 5382, the
retraction distance can be increased by α.
Initial point
R point
Z point (
=0)
L
Center of
tapping
Retract
completion
point
L
α
α
(when
is set)
2nd return
completion
point
1st return
completion
point
Basic procedure
(1) Start
Reset the CNC, then select MDI mode. Setting rigid tapping
retraction start signal RTNT to "1" starts rigid tapping retraction.
(2) Completion
Upon the completion of rigid tapping retraction, rigid tapping
retraction completion signal RTPT is set to "1", with which the
CNC automatically enters the reset state. Setting rigid tapping
retract start signal RTNT to "0" sets rigid tapping retraction
completion signal RTPT to "0".
(3) Stop
During rigid tapping retraction, setting rigid tapping retraction
start signal RTNT to "0" stops rigid tapping retraction, placing
the CNC in the reset state. To resume rigid tapping retraction, set
rigid tapping retraction start signal RTNT to "1". Rigid tapping
retraction can also be stopped by means of a reset or feed hold.