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Break Through with the Gears/Shaft

  • Yen-Chia Feng
  • Apr 9, 2016
  • 1 min read

Our system requires a single shaft to go through locked gears and bearings. We considered using cylindrical shafts that fit the bearings for the free-moving and fixed the rotation of locked gears with hubs The problem is, adding hubs and screws adds weight to the gear system and would create extra torque on the mount. The other solution is to laser cut an inverted key-way on the locked gears and machine a groove on the parts of the shaft that pass through locked gears. This solution would solve the issue with extra torque, but gears are made out of wood and it could easily shear.

Therefore, we moved on to the third, and current solution. We replaced the center part of the wooden gear with an acrylic disk, which has a D-shaft hole in the center. We press-fitted the acrylic disk into the wooden gear using 20/thousands increment to account for the parts evaporated by the laser cutter. Our next step is to machine the parts of the shaft that pass through the locked gears into D-shafts, which will lock the gears with the shaft with no relative rotation.


 
 
 

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