Strain Wave Gear

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Strain wave gear visualization - see the YouTube at 0.25 speed to understand it.

https://hackaday.com/2016/12/09/lego-strain-wave-gear-is-easy-on-the-eyes/

See another Hackaday Post on strain wave gears:

https://hackaday.io/project/19405-strain-wave-gear-with-timing-belts

Download simple model:

https://www.thingiverse.com/thing:2013137

Concept

2 concentric gears
Outside gear has N teeth, say N=100
Inside gear is smaller and offset from center. It has a slightly smaller number of teeth - say N-2
Difference in teeth number creates geardown of 100/2 = 50

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