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MECHANISMS (Rotary motion mechanisms (Friction drives (the velocities of…
MECHANISMS
Rotary motion mechanisms
Friction drives
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D, and D, are the corresponding diameters
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Worm gear
N„„ , and N „„ a re the velocities of the wheel and of the screw
Z, „ is the number of grooves of the screw and Z„„, is the number
of teeth of the wheel
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Pulley trains with belts
Iv i and N, are the respective velocities of the drive and driven
pulleys.
De Dn Di and D, are the diameters of each wheel.
Linear motion mechanisms
Levers
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Types of levers
Class 1, Class 2, Class 3
Fixed pulley
A fixed pulley is balanced when the effort F is equal to the resistance of the load, R
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Compound pulley
This ts a system of fixed and moveable pulleys, often called block and tackle.
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Mechanisms are devices that transmit and convert forces and motion from a dnvmg force or input element to an output element.
They allow use to carry out certain tasks more easily and more efficiently
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