Quote Originally Posted by RichardR View Post
Thanks I have already found the debounce setting and even set on 1000 it still drops out, however the time it takes to do that has enabled me to play with the settings, I am now going to wire the switches with screened cable, also I am going to earth bond all the axis on the machine
Well, earth the chassis / spindle of the machine at least. Then we'll introduce opto-coupler isolation on the limit switches, and take it from there. Listening to Richard, and his neighbour on the phone, I think things are starting to fall into place a little and their understanding and navigation around Mach3 is reassuring - gives me some confidence that there's light at the end of the tunnel.

Experiments with debouncing made it quite clear the controller/PC is rather susceptible to noise (even without motors/spindle) - I think this does need to be belts-and-braced.