Thor, or should that be Zeus?

[Desertboy]

Thanks Neale, I understand how the inputs / mapping work. Ive setup a few machines on CS Labs kit. Ill find the image / reference to why I believe Mach 3 is the problem here with limit inputs specifically.

My only experience with microswitches and CNC style controllers are Arduino based but I do know the Arduino has internal pullup resistors so that microswitchs work from 2 wires (Unpowered) but when you use inductive sensors they need to be powered so you have to turn the internal pullup resistors off in the firmware (You also need to wire some resistors to drop the voltage from 12v to 5v so it doesn't fry the Arduino.) and make sure you have the correct firmware setting for NO/NC. I wonder if this could be related?

I have an inductive sensor for auto levelling my 3d printer bed and an aluminium print bed and fried 1 Arduino before I found this out.