Like many of you Home Shop Machinists,Â shopÂ space is at a premium. My shop is located in my garage where I also store a few motorcycles and my Â vintageÂ sports car.
A big fear I have is one day turning on the lathe accidentally with the chuck key still in the chuck, and flinging it across the shop into the windshield of the Porsche!
I needed to create some type of interlock so I could not start the lathe unless the chuck key was removed and stored somewhere.
A simple solution was a piece of aluminum tubing with a lever switch tied into the lathe’s electronics.
A piece of tubing was turned to the proper dimensions and a slot was cut to attach a small “lever switch”
CAUTION!!! Use a properly rated switch to interrupt Â your circuit. This 5A switch is not rated high enough to interrupt the AC Â line voltage to most lathe motors. I’m using a DC controller on this lathe and interrupting a low voltage area of the circuit. Be sure you are using approve wiring and electrical shock shielding standards. If you do not understand these things, please hire a qualified electrician. Improper installation could kill you!
Â Using JB Weld, the switch was attached to the aluminum tubing
A couple holes were drilled and countersunk to attach to the lathe
Two holes were drilled and tapped in the lathe
A wire to interrupt the circuit (see warning above) and a bit of heat shrink tubing finishes the deal.
Now, no chance of a broken windshield!