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Gears can change direction of rotational force from one axis to another. For example, a wind driven mill. The wind turns a shaft that is horizontal. That shaft turns a gear that is vertical, and the vertical gear meshes with a horizontal gear that turns a vertical shaft. Gears can change rotational speed. With a small gear meshed and turning a larger gear, the larger gear will have a slower RPM. Gears can change torque to increase or decrease available power. A small low force gear driving a larger gear will provide more rotational force.

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17y ago

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