It is very easy to leave the Sherline mill or lathe ON with the speed control setting at low thinking it is off. I found myself thinking the lathe or mill was OFF only to realize days later that it was, in fact, ON. I also found myself changing tools with the equipment ON, again thinking it was OFF!
Adding an indicator light is very easy. Just buy a 110 volt indicator light from your local Radio Shack store. They come in a number of colors but I chose red to get my attention and indicate a warning. Drill a hole in the plastic case and connect the wires directly to L1 and L2 on the PC board. That's it. Now when the lathe or mill is ON you will have a light to let you know. Quick, cheap, and most importantly, SAFE.
Connect the indicator lamp wires to terminals L1 and L2 on the Sherline speed control circuit board.
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