I have a gantry type router (custom made) and I want to set up th Z axis.

I think it has lost the correct Z position as Z zero is about 80mm away from the Z up limit switch.

Whats the correct proceedure to set the Z zero? I assume it should be set to be the max Z height and not the lowest Z position?

A could just manually position the Z axis while it's off but I am sure there's a way to set it within the Mach3 software?

Any help appreciated!

Cheers.