Fanuc G81 Drilling cycle

[woodwood]

Hi all,

Just a couple of quick questions about drilling cycles.
Firstly, is it ok to change datum offset during the cycle? See below, using G57, G58 & G59:

G90 G57 G0 X-8.573 Y4.95 S3262
G43 Z50. H127 M8
G99 G82 R1. Z-1.55 F15. P500
G58 X-4.95 Y-8.574
G59 X8.574 Y-4.95
G0 Z50.

Secondly, am I right in thinking that I can drill different holes to different depths? See below with each hole having a different Z depth:


G43 H200 Z150. M8
M82
(-HOLE-1-)
G81 R5.0 Z-11.4 G99 F50
(-HOLE-2-)
X-4.950 Y-8.574 Z-6.4
(-HOLE-3-)
X8.574 Y-4.95 Z-6.5 G98
G0 Z150. G80


Thanks.

 

[ornerynorsk]

You have to look in your controller guide to see if your specific controller treats those canned cycles as modal or non-modal. Some things you cannot change mid-cycle.



It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[woodwood]

Thanks,

It is a Fanuc M10 but I don't have the manual here at the moment.

 

[ornerynorsk]

Canned drilling cycles are generally modal, meaning that you cannot change depths and datum points within the cycle. However, it is a simple matter to cancel out the cycle, re-establish datum, re-initiate a new drill cycle, call out new depths, and continue on. It only adds a few blocks of code if programming manually. If using CAM, it's a moot point.
I'm not familiar with the M10, but you could dry run your code to see if it would work, although I have my doubts.



It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.