What is a wheel and axle used for?

Wheel and axle, basic machine component for amplifying force. In its earliest form it was probably used for raising weights or water buckets from wells. Its principle of operation is demonstrated by the large and small gears attached to the same shaft, as shown at A in the illustration. read more

When used as the wheel of a wheeled vehicle the smaller cylinder is the axle of the wheel, but when used in a windlass, winch, and other similar applications (see medieval mining lift to right) the smaller cylinder may be separate from the axle mounted in the bearings. read more

The wheel and axle are primarily used for moving items and for transportation. It vastly reduces the friction between objects by converting it to a rotational motion. Common non-vehicular axles are seen in roller conveyors (with or without covering belts). read more