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Mechanisms (Rotary motion mechanisms (Gear mechanisms and cogwheels…
Mechanisms
Rotary motion mechanisms
Friction drives- two or more wheels: The first wheel is called the primary drive wheel. When it moves, it turns or drives the second or output wheel, causing it to move as well.
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Pulleys with belt- Uses: industrial machinems, vehicle engines, washing machines and drills 
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Worm gear: N^wheel= N^screw x Z^grooves / Z^wheel. Uses: lad counters, gear reduction systems, musical turning keys and windscreen wipers
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Gear train. N^4/N^1; Z^1 x Z^3/ Z^2 x Z^4. Uses: machine tools, robotics, vehicle gearboxes and some electrical appliances
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Linear motion mechanisms
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Fixed pulley- F = R. Uses: wells and equipment, for example
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Compound pulley- Uses: lifts, goods lifts and cranes
Other mechanisms
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Connecting mechanisms
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Movable connections
Oldham joint
Cardan joint
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