Took me while to figure it out. Firing up C machine and B machine at the same time. C machine was carving and B was finding the bit. When it touches the bit plate the GFCI trips. Tried a different circuit, same result. When C machine is finished, I will try running the B by itself. What could cause this. Don't want to replace the Z motor if that isn't the problem. I just replaced the cut motor on this machine at 1919 hours.
Thanks
Clint