I have been using Mach4 for years on a home made machine with ESS and the Z axis is moving in way I have not seen before.
Issue: Seems that the Z axis keeps moving down without moving back up before the next move. On another PC I use the MACH4 simulator and it runs correctly.
If you look to the image you see on the gcode the z axis should be -.2343 but if you look at the position it is at -.6177. So the router is PLOWING into the wood.
Thanks!
Phill