Nema17 2-stage planetary gearbox 10:1

prusaprinters

Here’s a design for a 2-stage planetary gearbox with ~ 10:1 reduction. It’s around 40mm tall and fits nicely on top of the Nema17 stepper motor, joined with some (>40mm) M3 bolts. The gearbox works just fine under the load and provides a decent torque, but I haven’t stress-tested the gearbox yet. Intuition suggests that thinner parts of planet gears should give up first, and therefore a smaller bearing would be more optimal (more in ‘Todo’). There are two versions of the gearbox top cover depending on whether you’ll be using a milled shaft or an M5 bolt for the output. Don’t hesitate to write suggestions and ask questions! Parts: <ul> <li>M3 bolts and nuts</li> <li>M2 bolts and nuts</li> <li>M2, M3 washers</li> <li>MR 105 ZZ bearing (for output shaft)</li> <li>6x 693ZZ bearing</li> <li>2x M3 5.35-5.5mm wide (and 1.8-2.0mm thick) square insert</li> <li>M3 grub screw</li> <li>Loads of grease</li> </ul> Assembly: <ul> <li>Print the parts</li> <li>Adjust the height of the first sun gear on the stepper motor and fasten it using square inserts and grub screws</li> <li>Press-fit MR 105 ZZ bearing into the top part</li> <li>Gently press fit (heating up the part slightly may help) 693ZZ bearings into planet gears.</li> <li>Join planets and spacers using M3 and M2 bolts (adding washers in-between bearings and enclosure.</li> <li>Join everything with ring gear/case using M3 bolts adding a lot of grease.</li> </ul> <h3>Print Settings</h3> Printer Brand: Creality Printer: <div>CR-10</div> Supports: Yes Resolution: <div>0.2</div> Infill: 100 Filament: - PLA Violet Notes: <div>Printed using lower speed.</div> Category: Robotics

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