This is an epicycloidal gear train: the smaller pinion roll around the bigger gear.

Some related videos:

Hypocycloidal Gear Train:
http://www.youtube.com/watch?v=BiZblvSX4XA

Planetary Gear Train:
http://www.youtube.com/watch?v=ECljAo1q1RQ

Gears:…

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Dual cam.The main cam is orange. The yellow one is added for cam g...