Differential Planetary Gearset

thingiverse

Now that you have a planetary gearset that functions as its own bearing, what else can you do with it? How about a large reduction in a small package: This drive gives a 91:1 gear ratio. It's much more convenient to print than the last version, and the only assembly required is placing the output ring onto the upper planets of the input. Instructions The input is the sun gear, which has a hex opening in the bottom so you can turn it with a drill or attach it to something. The output is the whole upper ring, which has its own hex opening. You can customize this in many ways, and if you change the numbers of teeth, the resulting gear ratio will be printed on the side of the input ring (which is hopefully visible in the render). The torque capability of this gearset is not amazing, though it could probably be improved by changing some of the parameters like thinkness and twist. If any of you come up with an application for it, I'd love to see it in action.