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A.T.
#3
Jan3-13, 04:24 AM
P: 4,061
As Drakkith said, gears are basically levers that can operate continuously. See:
http://en.wikipedia.org/wiki/Lever

They allow you to trade distance for force, or the other way around. For example this simple gear outputs less force, but more velocity than goes in:



Here the lever mechanism is indicated as a red line: