I have a jig that is made out of aluminum. The jig is clamped to the wood table and holds the wood workpiece. I want to stop Mach3 if the bit should ever touch the metal jig. That way if something goes hay wire my jig will and bit will be saved. I imagine I can connect/wire the jig and router to some port on Mach3 and issue some command to stop it if they touch and make a circuit, but I really don't have an idea where to start. Any detailed ideas would be greatly appreciated.
Dave

Hopeful this will help. You could set the pin up as an e-stop instead of the probe input. You wouldn't need a macro at all if you do it like that.

Brett

Good idea! You could also use a relay wired to latch on if contact was made to the fixture and then appropriately feed Mach3 with the correct e-stop signal - high or low. Darn, I wish my vertical mill was made of wood now too! Some of those tools that I have already destroyed would still be around. Sort-of like the SawStop table saw - amazing.

Bill Clemens