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Contrarotating mechanism — image 1

Contrarotating mechanism

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Printable contrarotating mechanism (same mechanism as a differential)

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Updated at source:

Model information

Category
Engineering
License
Creative Commons — Attribution — Share Alike

 

If you added a gear to the body you would create a differential. (I only realised that when my dad told me)

Parts:

  • body
  • bottom gear
  • top gear
  • cage x3
  • inner shaft
  • outer shaft
  • pin x3
  • side gear x3

The way I designed the parts to be connected is by softening the plastic with a soldering iron (120°C for PLA) and squishing it together. Other methods should work as well.

Assembly:

  • attach gears to their respective shafts (top with outer and bottom with inner)
  • attach pins to the body
  • put side gears on pins
  • put bottom gear with inner shaft on one side
  • put top gear with outer shaft on inner shaft
  • connect cage to its pins

DONE

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