![]() The flexible spline is deformed using a set of bearing balls and an elliptical plug on the shaft of the motor. In this case, there are 60 teeth on the input side and 62 on the output, giving a gear ratio of 30:1. Keeping the flexible spline stationery is achieved by making half of it engage with a stationary spline with the same number of teeth. Add a couple of extra teeth on the output side, and you get a high-reduction gearbox with fewer parts and reduced volume than equivalent spur gearing. Strain wave gears work by deforming a stationary flexible spline into an ellipse so the teeth engage the internal teeth of the output spline. ![]() created a little strain wave gearbox (harmonic drive) for when you want to trade speed for torque on NEMA 17 stepper motors. 3D-printed gearboxes are always an interesting design challenge, especially if you want to make them compact. ![]()
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