Originally posted by nervis1
OH man, had the same problem myself, crashed once because of it. Right after the program started the first thing it did was head for the table and bury my 1/2 roughing mill up into the holder. Luckily I hadn't set the setscrew into the flat because it was a test run...just in case. Also ran at 25% feed and rapid.
I put a z5.0 after the G43 in my post per the advice of the guys on the Onecnc board. My machine was going rapid to z0 before putting the height offset into effect. That worked fine. At least untill I use a 6" tool. I should change it to z10.0 now that I think about it.
Since reading guys advice now and then to avoid using G92, I have been slowly weaning myself off it. So now I work in G54 for a typical single part setup. But, my Shadow controller also has this problem with moving to Z0 whenever a tool length offset is called. Since I usually desire a Rapid plane of Z1, this looks (and is) dumb to see the tool moving all the way to Z0 and then back up to Z1 on its first programmed move. Instead of using a default of Z0 in the G54 offset, I use Z1 in all of my work coordinate offset tables, as a basic starting value. I always call the G54 before the tool length offset. This means when the tool length offset is executed, the movement is to Z1. not Z0. It's one way to deal with ancient controllers.
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)