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9. SPINDLE SPEED FUNCTION
817
In rigid tapping mode, the tapping axis is fed at a rate specified by F; the
spindle speed is S×360(deg/min). Override is invalid for both of them.
An override of up to 200% can be applied to withdrawal operations by
setting bit 4 (DOV) of parameter No. 5200 to “1”, and setting an
appropriate override value in parameter RGOVR of No. 5211. The time
constant for withdrawal operations can be modified by bit 2 (TDR) of
parameter No. 5201; when it is set to “1”, the values in parameter Nos.
5271 to 5274 are used as the time constant for withdrawal.
Linear acceleration/deceleration is valid for rigid tapping.
Override is invalid for rigid tapping. Fixed override can be applied to
withdrawal operations by setting bit 4 (DOV) of parameters No. 5200 or
RGOVR of No. 5211.
Dry run is valid for G84 (G74). When the dry run is applied to the tapping
axis speed of G84 (G74), tapping is performed. The spindle speed will
match the dry run speed.
Machine lock is valid for G84 (G74).
When G84 (G74) is executed with the machine locked, however the
tapping axis and the spindle do not move.
When the reset operation is performed during rigid tapping, the mode is
reset. The spindle motor goes to the ordinary mode, but G84 (G74) mode
is not reset.
The feed hold and single block functions are nullified for G84 (G74).
The feed hold and single block functions in rigid tapping mode can be
effective by setting bit 6 (FHD) of parameter No. 5200 to “1”.
As with the machine lock signal, the feed hold and single block functions
are also effective for the spindle indirectly, through tapping axis
operations.
G84 (G74) can be executed only in the MEM and MDI modes.
Rigid tapping cannot be performed in the manual feed mode.
In rigid tapping mode, the backlash is compensated for the lost motion at
forward and reverse spindle rotations. Set it using parameter No. 5321
to No 5324. The backlash compensation is normally made for the tapping
axis.
9.11.3
Rigid Tapping
Specification
D Feed rate
D Acceleration and
deceleration
D Override
D Dry run
D Machine lock
D Reset
D Feed hold and single
block
D Operation mode
D Manual feed
D Backlash compensation