I have two faceting machines, one I bought and one I built myself. I installed optical encoder protractors on both machines as written in Tom Herbst’s book Amateur Gemstone Faceting. After he saw photos of my homebuilt machine he urged me to do a write-up of it’s construction as he thought it might be of interest to other factors. If interested, I posted it on my website: http://www.jrobertslater.com under the about tab.
Very nice! I’m going to go back and reread more carefully, but this looks like an outstanding machine. There have been recent queries about building faceting machines, and it’s good to have something to refer them to.