Emmett's planetary gearset reloaded (parametric)

thingiverse

Inspired on http://www.thingiverse.com/thing:59075 (Differential Planetary Gearset), but I did it as a modified version of http://www.thingiverse.com/thing:53451(Gear Bearing) script instead. The concept is EXACTLY the same as Emmett's Planetary Gearset, but I did it using two stacked Gear Bearings instead. The total gear ratio is printed in the side of the rings (both of them). WARNING Tolerance is a little too tight (0.15) and the attack angle is modified from 45 to 30, making it even worse. If your machine is not tuned to precision or if you're printing in PLA instead of ABS, consider increasing it. Instructions Materials needed 4x 1/8" screws, 1" long 8x 1/8" screw nuts 4x 1/8" screw washers 1x 3mm screw (if possible, a short and headless one) 1x 3mm nut Tools 1/4" screw and nut (just to "break" the planets free for the first time) Screwdrivers for 1/8" and 1/4" screws Pliers Instructions 1- Print two matching pieces; 2 - The planets are (probably) stuck, and need a lot of torque to move. 2.1- I break the "lower" gear bearing using the motor coupler, using pliers. 2.2- I bolt a 1/4" screw and nut in the hole of the sun gear of the "upper" gear bearing, that way I can get grip. Once tightened, force it one way to break the planets free. 3 - Break the bridges in the nut traps of the planets to open the hole to the screws. 4- In all planets of the "lower" bearing, put a nut in the nut trap, and a screw the other side, and thighen then a little. 5- Allign all the nuts in the lower planets with the nut traps in the upper ones. 6- Fasten all the planets with a nut and a washer each. It may be a good idea to run it on a drill to soften it, but BE SURE all the parts are tightened, and also check if there is ABSOLUTELLY no axial play on both bearings. 3000 RPM flying parts may result in a nasty accident, do it on your risk. One of my gearsets were all wobble, so I discarded it instead.