Pulley blocks give direction to the rope while loaded; they are able to increase the line pull or lifting capacity of a hoist or winch by multiplying the number of lines. It is a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.
Needle bearings are a small cylindrical type of roller bearings which are used to prevent friction between moving surfaces which have low rotational speeds. Needle roller bearings are usually used when space is at a premium as needle bearings are much more compact than ball bearings.
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