CNC

I've got my machine moving around pretty darn good now, it repeats to
under .002 which is the amount of the backlash. I'm having a problem
with the EMC 3Dtest. sometimes it works good and some times it Quits
before its done. The e-stop reset comes on. Could the speed be to high?
Also trying to figure out to set the display to zero after you move the
table and without going thru the home routine.