Sorry to hear that you had all that trouble. I think I experienced some of those glitches at a Shop. The G84 RH Tapping instead of just tapping a 1/4-20 it went in fine and on the retract reduced it's spindle speed too much and broke the tap. The next one started hunting for it's origin (M19), found it, then turned the spindle off on entry and turned it back on at exit. The machine had some issues, mostly mental, lol. The worst one was a wrong tool pickup. For some reason the machine pickedup T3 went to the reference point, returned home (without a G91G28Z0) took another tool T6 and went to go to Town on my part. Bad Machine, Real Bad. The shop supervisor was lucky that I was close to the machine. No one wants a 2.0 diameter Shell Mill to Drill #7 holes with.
Toby D.
"Imagination and Memory are but one thing, but for divers considerations have divers names"
Schwarzwald
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
www.refractotech.com