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How Gears, Wheels & Axles Work

Rotating machines that trade speed for torque — meshed gears and gear trains, the wheel and axle, and the mills, steering wheels, and rack railways that put rotation to work.

Wheel

Wheel

Axle

Axle

Gear Train

Gear Train

Bicycle Gearing

Bicycle Gearing

Windlass

Windlass

Potter's Wheel

Potter's Wheel

Millstone

Millstone

Differential (Mechanical Device)

Differential (Mechanical Device)

Steering Wheel

Steering Wheel

Watermill

Watermill

Rack Railway

Rack Railway