How Gear Reduction Works (High Quality Mode)
Turn a big gear with a small one: what changes?
1:02 · 1080p · With AI narration and captions. This sample was made with the same system as this service.
Narration (full text)
Click a time to play from that scene.
How Gear Reduction Works
With gears, you can slow down a rotation. This is called gear reduction.
10 teeth turn 20 teeth
Let's turn a big gear with 20 teeth using a small gear with 10 teeth.
One turn moves 10 teeth
When the small gear turns once, the big gear moves forward by 10 teeth. That's 10 out of 20, so it makes a half turn.
1/2
The small gear turns twice before the big gear turns once. The rotation speed is cut in half.
Same push, twice the radius
Now, what about the turning force? The teeth push each other with equal force, but the big gear's radius is twice as long. Like a lever, pushing farther from the center gives more turning force.
2x
Because the radius is doubled, the turning force, or torque, doubles too.
Turning Speed into Force
You give up half the speed and get twice the turning force. That's gear reduction.
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