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Roller: A regular pulley has a slot for a belt, chain or cable. A reel is a broader pulley frequently used in cable techniques, allowing the cable to be wound close to a number of moments the diameter of the reel.
In a compound pulley system, there is equally a movable pulley and a mounted pulley. This means that not only does the load “feel” lighter, but you can also change the route of the force. Although this sort of configuration can transfer hefty loads very simply, it arrives at the value of requiring really a bit of motion to do the occupation.

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