Strain Wave Gear

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

See another Hackaday Post on strain wave gears:

Download simple model:


  • 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