Gears - How do they work? - Different types explained and compared

An easy-to-understand explanation of how gears work and why they can give a machine more speed or force (but not both at the same time).

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Types of Gears: Design, Types, Applications, and Materials

Gear Types, Definition, Terms Used, And The Law Of Gearing, by LEARN ENGINEERING

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Types of Gears: Design, Types, Applications, and Materials