Hey everybody! So recently I bought a Smithy Granite 1340 MAX Mill Drill Lathe - I love it, it's a great machine and a huge upgrade over my previous mill drill lathe. I do have one small problem with it though - there's no real "finishing pass" gear. The slowest speed and lowest gear is still cutting 52 threads per inch and while that's OK, and I could grind a tool with a radius tip to make it even better, I'd rather just have a finish pass speed!
So I made one!
I've worked with the Parallax Propeller and Easy Driver boards for years, I used them in my Monster in a Box project, and have used them with my stretching machine project as well - they are really easy to work with and the Parallax Propeller is super easy to program.
Here's a quick wiring diagram of how I wired things up
and here's a video of me explaining a bit on how I did it...