IMO,
I don't like to use G92 at all...
Do you run your Fadal in format 1?
I prefer to use format 2 at the behavior is more predictable. For instance, I only want the CNC to do exactly as I program it to do. When in format 1, the CNC always wants to start from the set home position, so if it is not there when you start, it goes there 1st. I hate that!
Sometimes, when doing a simple operation I may just want to run one little cut then move out of the way enough to change parts, then start from there again. In format 1, the CNC will always go home 1st, this really bugs me.
I find the G54 or E1, thru G59 or E5 coordinate offsets much more accurate than using the G92.
I always prefer to have an absolute X, Y and Z position to work from relative to the machine base coordinate system (Cold Start Position).
Then if any shifting is needed I perfer to use one of the other offsets to "operate on", then when I want to go back to the original offset position I just overwrite the "operating coordinate" with the original coordinate which never changes. Also I like to always use G90, although G91 or incemental programs work fine, I think staying in absolute is just more accurate especially when using cutter compensation...
If you want an example let me know, I'll document...
Regards,
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Scott_bob |