Yes that's my problem, I'm using Mach3 and A Gecko G540. I can jog XYZ, but when running the gcode, the Z will not plunge into the material. I have completely rebuilt the controller to no avail. I think I have tried everything, but I guess not. I calibrated my motors, tried a different computer. When it runs and the gcode is executing, the motion of the axis's seem to be moving, but very little. When it did work, it cut a much bigger path. I will keep trying, but I think it must be some small thing I forgot to do. I will keep you posted if anything changes.