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Mechanisms (Rotary motion mechanisms (Worm gear (Uses (Lap counters, gear…
Mechanisms
Rotary motion mechanisms
Worm gear
Is a screw that moves a helical cogwheel that is set perpendicular. The equation is: Nwheel= Nscrew · Zgrooves/ Zwheel
Uses
Lap counters, gear reduction system, musical tuning keys and windscreen wipers.
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Pulleys with belt
They consists of two pulleys that are in a certain distance. Their axles are parallel and they rotate simultaneously due to the effect of the belt.
Uses
Industrial machines, vehicle engines, washing machines and drills.
Gear train
This is a system of more than two gears, connected together. The equation is: N4/N1= Z1·Z3/Z2·Z4
Uses
Machine tools, robotics, vehicle gearboxes and some electrical appliances.
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Friction drives
They are made up of two or three wheels that are in contact. The ratio between the rotation velocity of the wheels depends on their relative size. The equation is: N1·D1= N2·D2
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Pulley trains with belts
It´s a system of pulleys with a belt formed by more than two wheels. The euation is; N4/N1=D1·D3/D2·D4
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Linear motion mechanisms
Levers
Is a rigid bar that is supported by a fulcrum. The F means the force, the R is the resistance, the d id the distance and the r is the distance from the R to the fulcrum.
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Compound pulley
This is a system of fixed and moveable, often called block abd tackle. This system is used in lifts, good lifts and cranes. The equation is for block: F=R/2·n and for tackle: F=R/2n
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Definition
They are devices that transmit and convert forces and motion from a driving force or input element to an output element.
Classification
They can be: transmiting motion(linear or rotary), transforming motion(rotary to linear or rotary to reciprocating), joining elements, storing energy, and controlling and regulating motion.
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