Experimental split ring/harmonic planetary drive

thingiverse

This is an experimental split ring/harmonic planetary gearbox; Sun gear is the input, output is the top ring which has 2 more teeth than the ring below - each revolution of the carrier (planets) will move the outer ring by 1 tooth. This is still experimental as i can't find or access suitable documentation on this type of gearing reduction. Keep in mind that i didn't include the planet carrier because i'm still working on exact gear spacing, which isn't as trivial as it sounds because of 2 different modules i used to align ring diameters. Some technical data: Bottom(fixed) ring teeth: 56 Top(output) ring teeth: 58 Sun teeth: 24 Planet teeth: 16 Bottom ring module: 1.5mm Top ring module: 1.45mm Planet module: 1.45mm Sun module: 1.5mm I will be updating this project with real pictures soon, and if this turns out successful i'll be completing the design and sharing it. NOTE: Designed to be mounted on NEMA23 standard motor UPDATE: Added a video of the prototype in operation. Experiment turned out to be a success, althought i had to print in PLA, which doesn't have the properties i'd like in a gear system. Tolerances turned out to be tight, and i had very little manual sanding and finishing. Video shows a slightly modified output ring as i didn't need to enclose it fully to test it. System functions with no visible or otherwise noticeable backlash, and works as intended. Therefore i conclude this experiment as finished, and will be working on enclosing and releasing a fully functional and ready-to-print gearbox. https://www.youtube.com/watch?v=7yRP8Xe_WHM