I'm running Mach 4 on an Avid pro series. When using a roughing toolpath, I set the origin with the touchplate and all is well. When it finishes the roughing, I simply change out the bit to the finishing bit, touch the Z axis (because the X and Y should be the same) and go on. It has worked fine, but I had to stop Mach 4 by hitting the stop button on the screen in Mach 4 (not the emergency kill switch). I made the correction (forgot to put the dust shoe on, and restarted the toolpath.
It started 1/2 to 3/4 off on the x axis ruining the piece. Should I recenter the x and y each and every time I change bits? It's hard to recenter the x and y using the touch plate with a tapered ball nose.