Quote Originally Posted by AndyUK View Post
Damn. Did you measure where the continuity ends?
Well I hadn't, and when I did, it was continuous from frame to tool, (or to acknowledge M_C's point, it was the six times I checked)
Previously I had just tried the touch plate without attaching the tool clip. So now I attached the tool clip to the frame.....and it works! So if I earth the -ve digital input for the probe my touch plate will (almost M_C?) always work without needing to use the tool clip

Not sure where that leaves me though. This might be worth while to streamline use of the movable touch plate. Still looking into suitable retracting or coiled wire to allow me to leave it permanently connected in a holder on teh machine (it is looking for it in the draw that adds the most time)

However it still leaves me weighing up the advantage of a fixed tool length sensor. Feedback here from people like Neale helps in that evaluation. It also helped looking at Ger21's screen set and the macros included for both approaches. If I have a fixed sensor, I certainly don't want to have to trigger it first to check it is working so a switch (With or without overtravel protection seems the way to go. I am now wondering if I can use my cheap panel switch to act as a touch plate by connecting the body to signal and use the switch as over travel protection (in case M_C is eventually proved right)

Thanks for your help