Carbon Brush - Auto tool setter

I use this for my auto tool setter on my DIY CNC.
This allows the tool grounding circuit to short when the spindle touches the brass plate.
Thus allowing the marco to set the CNC bed, and the tool.
Completely hands free. (Just change tool and hit start)

This is a video of my OLD setup. I don't have a current video, but the principle is the same.
https://www.youtube.com/watch?v=VVrVgF8v1ZI&t=47s

- You do need to setup the macros in order to do this (You can google it)
- Worked for both Mach3 and my current setup with UCCNC.