Engineering: Mechanical engineering

How Gear Reduction Works (Standard Mode)

When rotation slows down, what happens to force?

1:03 · 720p · With AI narration and captions. This sample was made with the same system as this service.

Narration (full text)

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  1. How Gear Reduction Works

    Gears can slow down a rotation. This is called gear reduction. Let's see how it works.

  2. 10 Teeth and 20 Teeth

    Let's use a small gear with 10 teeth to turn a big gear with 20 teeth.

  3. Turn the small gear once

    When the small gear turns once, the big gear it meshes with moves by 10 teeth. That's 10 out of 20, or half a turn.

  4. 1/2

    The small gear has to turn twice before the big gear turns once. The speed is cut in half. That's gear reduction.

  5. 2x

    In exchange, there's a bonus. The turning force doubles.

  6. A lever effect doubles the force

    The teeth push with the same force, but the big gear's radius is twice as long. Like a lever, pushing farther from the center gives more force.

  7. Trade Speed for Force

    Give up half the speed, and you get twice the turning force. That's how gear reduction works.

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