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

thingiverse

What? 3D printed gears for a metal lathe?? Preposterous! Hang on... they actually work. Don't believe me? Check out this video from the esteemed Tubalcain if you need proof: https://youtu.be/V6Aq0d1070I These gears were inspired by Gadget047 (https://www.thingiverse.com/thing:143893). I printed out those gears and they have worked OK. However, there were no oversized gears (e.g. 120 teeth) to be had, and I found the lack of tolerance on the gears central shaft and keyways to be problematic. This OpenSCAD library allows any number of teeth to be specified (down to about 30 gears). And it includes a tolerance factor which compensates for a 3D printers printing bore holes slightly smaller than expected. I also include a very thin "gear" that can be printed out in a short period of time to check the tolerance of your 3D printer. If it slides onto the other gear parts, great. If not, then you may need to open the OpenSCAD file, increase the tolerance value slightly, and output the gears again.