Mid program restart
I thought I was being safe I have the setting turned on to have the Haas reread the program whenever I start somewhere other than the beginning. However, on my 1996 machine's software version, there is still a potential for a problem.
What seems to be the case, is that the machine normally moves to the 'recovery position' just before the line that I elected to restart on. That seemed clear to me from past experience. However, I had a circumstance where I happened to be using a positive Z value in a work offset. Apparently, when the machine makes the move to this 'recovery position' this does not include a regard for a positive Z in the work offset. Instead, it seems to just move to Z0 in that work offset (initially).
This happened to be a lower position than I expected (it was not the actual Z coordinate of the recovery position as written in the program), and fortunately, the tool was almost clear of the part, but it did move down and graze the side of the part. I was at 5% rapid, because I was being cautious on a complex setup, and was jealous of my multi-angle head's safety Nonetheless, this movement did not make any sense to me when I saw it happening.
I don't know if anyone else has noticed anything like this, or not?
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)