Harmonic Drive built into an off-the-shelf ball bearing
thingiverse
Undoubtedly there is something wonderful, if not magical, about harmonic drive gearing, also know as strain wave gearing. If you want gearing with high ratios and little backlash and a lightweight design, I guess there is no way around it. In this post I present a practically usable design with i=-21 (or i=20 respectively depending on the driven side) which can be transformed into an i=-399 (or i=400 respectively) gearing with just a small but subtle change in the flexible spline. The design builds (and is finally glued) around a thin-section ball bearing (85x65x10mm) type 6813 and employes a stepper motor Nema 17 to drive the wave generator populated with 4 ball bearings (16x8x5mm) type 688ZZ. See how it is composed and how it operates: https://youtu.be/DlZzknQdTlU
With this file you will be able to print Harmonic Drive built into an off-the-shelf ball bearing with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Harmonic Drive built into an off-the-shelf ball bearing .