Tony. I am off to bed now and had a small drink. But in the morning if nobody has responded I will check my Mach3 and let you know the settings for it. You need two homing switches as the way it works is that both motors should drive the axis back to the home position then one switch trips and backs off then the other does the same. Its also important to have exactly the same setup in motor tuning for both the motors. When it works it will work fine. ..Clive