Specifications

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CONCISE GUIDE FANUC 58
In rapid traverse the tool reaches the values of X and Z set in the block before the first G73 (thus these
values determine the point where the tool will start to work).
An increment takes place which is equal to the values set in parameters U and W of the first G73 and the
number of profile repetitions expressed in parameter R.
The tool makes a series of cuts going from the point set in block P up to the point set in block Q.
At the end of all the rough machining cuts the tool makes a pre-finishing cut to leave even machining
allowances (parameters U and W , with sign), and returns in rapid traverse to the starting point. Value U
(that determines the diametrical machining allowance along axis X) will be positive for external machining
and negative for internal machining, parameter W (that determines the machining allowance along axis Z)
will be positive for machining from the back spindle toward the spindle and negative for machining from
the spindle to the back spindle or for machining on the back spindle in machines with this option)
When performing the cycle the tool works with the feed programmed in parameter F of the G73 cycle. Any
feeds programmed in the profile description blocks will be activated only during finishing operations.
NOTE. the rough machining cycle G73 does not use the tool radius offsets (G41, G42, G40) which can,
of course, be activated for finishing (cycle G70).
The finished profile of the part cannot be managed in a sub-program, but only inside the cycle itself.