
B-64254EN/02 APPENDIX D.LADDER PROGRAM ADAPTATION
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D.4 LADDER MODIFICATION FOR REVERSE-TAP CYCLE
Following ladder modification is required in order to execute reverse
tapping cycles.
CAUTION
1. Without the modification is not possible to execute
reverse tapping cycles.
2. It is necessary to set No.4002#5 to 0 for reverse
tapping cycles.
D.4.1 Reverse Float Tap Cycle
Canned cycle G84 is used for tapping. G84, as standard, can be used
only to create standard tap. Within the execution of G84 the M codes
determining the direction of spindle rotation (M03, M04) are
sequentially commanded.
Therefore to execute a reverse tapping is necessary to reverse the
meaning of M03 and M04 by PMC ladder program.
In TURN MATE i the reverse Tap cycle G84 is executed by using
following template program.
Mmm1 (M code to specify reverse-tap)
M03;
G00 Z_;
X0.;
G84 Z_ R_ Q_ P_ F_;
G80;
G00 X0.;
Z_;
When Mmm1 is executed the spindle rotation for tapping is reversed.
It means the meaning of M03 and M04 are reversed.
At the end of the tapping cycle the meaning of M03 and M04 have to
be reestablished at the original meaning. Use the falling edge of PMC
ladder signal F001#5 to reestablish the original meaning of M03 and
M04.
Please refer to ‘6.4.3 Reverse tapping sequence’.
NOTE
The value of Mmm1 code specifying
reverse-tapping is defined in parameter No.9241.
M code value defined in
parameter No.9241