back bore cycle?

[manuelc149]

is there a back bore cycle? if not what is the way to go? thanks

[Neal]

There is not a back bore cycle. Write a custom subroutine and use that to back bore.

Neal

[ParkerMillguy]

Is this a VMC? Coudn't you just use a G76? Position head so it will clear through bore (M19). Move to center after clearing bottom of part, then program a G76 G98 R-(current Z position) Z (Less - to feed in Z positive direction) I-(if bar is at 3:00 at M19). Then move back to clearance position for through bore, And move out in Z to clear part.

[Neal]

The canned cycles will not allow you to "drill" in an upward direction.

Neal

[ParkerMillguy]

Is this just a Fadal thing? I can't say I've ever tried it, but I don't understand why it wouldn't work.

[Neal]

The reason that it won't work is the software is written in such a manner the it is illegal to move upward toward or pass the clearance (R) plane or initial (I) plane. The sub program is a preset set of instructions as to motions to be executed. Violation of the predetermined moves will result in an error.

Neal