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Showing results for tags 'speed readuction'.
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In my robotic arm, I needed a significant speed reduction for the rotation of the last moving element, i.e. no large torque, but small compact design. I tried several gearing solutions, incl. the well-known planetary gearing with a large 56t turntable. The latter one is compact, but its 1:3 gearing ratio is not sufficiently low and also it suffers from large friction between the two pieces of the turntable. After some experiments I came with a compact planetary mechanism that uses a small (28t) platform and a 2-stage down-gearing train producing 1:6 ratio, more precisely -1:6. Besides the turntable, 2 24t gears and 4 (or just 2) 8t gears. Here is a couple of pictures: And a video showing the mechanism on a test bench: