Q:

# How does a crane work?

A:

Cranes are common pieces of equipment on construction sites that are used to lift heavy materials, like steel and concrete, and heavy objects, such as torches and generators. The crane is supported by a heavy base that holds the mast. This leads to a gear and motor that help operate and rotate the crane. From there, several horizontal components extend out and allow for the crane to be loaded.

Know More

Because cranes are so tall, they need to be supported by a sturdy base. The base is generally bolted to a large concrete platform. This allows the mast to remain sturdy, even as it lifts variable amounts of weight to great heights. At the top of this mast, cranes have a gear and motor. This combination of equipment is called a slewing unit. Atop the slewing unit are three additional components: a horizontal jib, a machinery arm and an operator cab. The horizontal jib is the portion of the crane that carries the load and uses a trolley. The machinery arm houses the motors in the crane and also has several heavy concrete counter weights; these help to balance the machine out when it is lifting. The electronics required to control the crane are held inside of the operator cab.

## Related Questions

• A:

A piston is a cylindrical plunger that moves within a metal cylinder through the four strokes of the engine cycle: intake, compression, power and exhaust. While their motion is predicated on other engine parts and the mixture of air and fuel, the motion of a piston is central to the functioning of an engine.

Filed Under:
• A:

A gyroscope works due to precession. Precession is the movement of one axis around another axis on an object that is spinning, which changes the direction of the first axis. This movement of the axis is what creates the motion of the gyroscope.

Filed Under:
• A:

Newton's cradle, or the executive ball clicker, operates by passing the momentum of a moving ball through other balls of similar weight in sequence until it reaches the ball at the end of the line, causing it to swing away from the column. Gravity then causes the moving ball to slow and swing back to strike the column and pass momentum in the opposite direction.