Atlas Lathe Change Gears from OpenSCAD, 96 teeth and 120 teeth, customizable

thingiverse

What's this? 3D printed gears for a metal lathe? Preposterous! Wait a minute... they actually work. Don't take my word for it - check out Tubalcain's video if you need proof: https://youtu.be/V6Aq0d1070I. These gears were inspired by Gadget047 (https://www.thingiverse.com/thing:143893). I printed those gears and they've worked okay so far, but there was a lack of oversized gears to choose from - e.g., 120 teeth. What really bothered me was the limited tolerance on the central shaft and keyways. This OpenSCAD library lets you specify any number of teeth (down to about 30 gears). Plus, it includes a tolerance factor that compensates for 3D printers printing bore holes slightly smaller than expected. I've also included a thin "gear" in the design. Print it out quickly to test your 3D printer's tolerance. If it fits onto other gear parts, great! If not, you might need to adjust the OpenSCAD file and increase the tolerance value before trying again.