Robot joint gear strong 123:1 with herringbone
thingiverse
This is the latest design I've developed to create a strong robot joint using NEMA17 Stepper motors. You'll need to print out four copies of the Sun_and_3xPlanet.stl file. I made some adjustments by adding a slightly smaller sun to reduce friction. Alternatively, you can scale down the original model by 0.97 in both x and y axes, which will also result in a tighter stepper fit. Short test run: https://youtu.be/D0rOprXt0t4 Gears used: Sun gear: 26 Planet gear: 26 Output Gear: 100 Input Gear: 97 Ratio strain wave: 100/3 = 33 Ratio Planet: 97/26 = 3.73 Ratio Total: 3.73 x 33 = 1:123
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