I am trying to make a brain to turn the coolant on only when the G-code is running and the Z-axis gets with-in .125 from the part and lower.

Any hints?

My coolant or mist is on output 4

thx chuck

Ok here is a brain,

It looks at the Run LED, and Z position dro, (assumes -Z is going down into your work, and 0 is the work top surface).
it then turns on output4 when z is less than .125

scott

Thanks a million poppabear it works like a champ and helped me figure out how this works.