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Pulleys

What can a pulley do?


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2011-01-07 01:27:13
2011-01-07 01:27:13

So you've got a heavy load, and you want to move it. You might try a simple machine that's the basis of much modern machinery --- a pulley. There are six simple machines: an inclined plane , a lever, a screw, a wedge, a wheel and axle, and a pulley. Basically, a pulley changes the direction of an applied force. Thus, for instance, you can pull on the cable of the pulley, and it will pull a weight.

A pulley, which is derived from the Greek word polos, meaning axis, is a wheel with a groove. A rope, belt, or cable runs inside the groove. That mechanism can be used alone or connected with other pulleys in a pulley system. The greater the number of pulleys in the system, the less force it will take to lift an object.

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There is a crankshaft pulley, alternator pulley, power steering pump pulley, AC pulley, idler pulley, tensioner pulley, etc.

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a coumpound pulley is when there is a fixe pulley and movable pulley working together

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fixed pulley,moveable pulley and block-and tackle pulley

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a single pulley only has one pulley. It can be called a movable pulley or single fixed pulley. A single pulley can have the effort going up or down.

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A compound pulley has two pulleys. A Fixed and a Movable. A single pulley just has one pulley.


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