Yaskawa YASNAC PC NC Programming Manual - Manual (Page 177)

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YASNAC PCNC Programming Manual Chapter 4: Enhanced Level Commands
(4) Relationship between the Solid Tap and Other Operation
(a) Dry run
Whether the solid tap cycle or the conventional tapping should be executed when G93 is
executed with the DRY RUN switch ON can be selected by the setting for a parameter.
If a tapping cycle is called up with the setting of “pm4016 D6 = 0”, the cycle is executed
in the following manner.
If G93 is executed with the DRY RUN switch set ON, G93 is invalid and the G84/G74
command called up in the solid tap mode is processed as the G84/G74 command called up
in the conventional tapping mode. The feedrate for this operation is determined by the set-
ting of the JOG switch. Once the solid tap mode is entered with the DRY RUN switch
ON, the G84/G74 command is processed as if the command were called up in the conven-
tional tapping mode even if the DRY RUN switch setting is changed from ON to OFF dur-
ing the execution of the cycle. Therefore, the spindle does not start even when G93 is
executed.
For the execution of the G93 block, whether the DRY RUN switch is ON or not is judged
when the G93 code is read. Usually, this state is determined while the commands in the
preceding block are executed. Therefore, when G93 is operated with DRY RUN ON for
program check, etc., be sure that the DRY RUN switch is ON from the beginning and do
not change it before completion.
(b) MST function lock
If G93 is executed with the MST FUNCTION LOCK switch set ON, G93 is invalid and
the G84/G74 cycle is executed in the conventional tapping mode. Spindle position is not
controlled, either.
Whether the solid tap cycle is executed with the MST function lock state or not is judged
when the G93 code is read. Therefore, if the G93 program should be checked in the MST
function lock state, the MST LOCK switch must be set ON from the beginning of opera-
tion so that it will not be turned ON during the operation.
(c) Machine lock, axis-dependent machine lock
If tapping cycle is executed in the solid tap mode with the MACHINE LOCK switch or Z-
AXIS LOCK switch of axis-dependent machine lock switches set ON, although the spin-
dle rotates, Z-axis does not move but only the position data are updated.
(d) Feedrate override and spindle override
During tapping cycle in the solid tap mode (G84 or G74), feed override is fixed at 100%.
Note that override for rapid traverse is valid. Spindle override is also invalid during tap-
ping cycle in the solid tap mode and fixed at 100%.
(e) Feed hold
pm4016 D6 = 0 Conventional tapping cycle
pm4016 D6 = 1 Solid tap cycle