100K subscribers! Here's a treat for you. I use this to rough out profiles and drill patterns without the hassle of measuring or laying out. This makes it very easy for us home gamers who don't have CNC or even DROs. Enjoy! If you want to help share more vids you can chip in at http://www.Patreon.com/AvE XYNUDU (machining channel) posted a similar technique for machining gears on a lathe with a microscope. Check it out here: https://youtu.be/PBlBJ5RWTSk I don't know if anybody has done a vid on this before but if there is please link it in the comments. Also, if anybody is interested in making an app to turn your phone into a DRO please PM me.