there are a few things one can try. I think it's either the probe or you have some emi which is causing the probe to register a touch. I use 12V on all my switches to avoid false inputs as the 3v & 5v are prone to have this in environments with large RF spikes "Plasama Arc & VFD,s"

1.) when your probe stops working and keeps saying it's connected un screw it from the BOB "MAKE SURE YOU CAN STOP YOUR MACHINE" try probe again you will need to stop the machine from crashing but that will at least give you an idea if the issue is with the probe and cable?

2.) take some twin core flex wire connect it into the pins your tool setter goes and touch off with the bare wires. you can do this manually holding the wires and just touching them together. you would need to touch then together twice as per your probe routine.

make sure you are confident you can stop your machine when doing this & take all bits out of your machine so that the spindle does not crash but rather the motor stalls if it does not stop in time.



Quote Originally Posted by Ollie78 View Post
1- It is connected to ground on the BOB with one wire and one of the inputs (number 2 I think) I have tried switching the wires around to no difference in result.

2- I did try this before, again no difference. The VFD is not in the same control box and is grounded by its own plug.

3- I have not done this. However I can see that it must be working to a degree as the led indicator in the diagnostic screen of UCCNC is showing when I touch the probe to the bit.

I am thinking it could be when the stepper driver starts the Z axis moving that is causing the issue as it lets me begin the process and registers the first touch, then as soon as it should start moving towards the plate it freaks out and throws the error message.
I will have a look again next time I can spare a few minutes.

Thanks

Ollie