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Mechanims (Fixed pulley (A fixed pulley is a wheel that has a groove…
Mechanims
Fixed pulley
A fixed pulley is a wheel that has a groove around it into which a rope,chain or belt fits . It rotates around an axle that is fixed to an immobile surface.
A fixed pulley is balanced when the effort F is equal to the resistance of the load , R:
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GEAR MECHANIMS WITH A CHAIN 
These are two cogwheels with parallel axles that are a certain distance apart, they rotate simultaneously by means of a metal chain or a toothed belt stretched over both wheels.
The chain transmits the rotary mouon of axle I to axle 2 by means of gears I and 2, and the two gears rotate in the same direction
To calculate the ratio between the rotation velocity of the drive wheel cogwheel (1) and the driven wheel (2), use the same formula as for gear mechanisms
The relation between the rotation veloaties of the wheels depends on the number of teeth of the gear
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PULLEY TRAINS WITH BELTS
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Compound pulley
This is a system of fixed and moveable pulleys, often called block and tackle.
If we use more pulleys , the system becomes more complex , but less effort is needed to move the load.
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Movable pulley
A moveable pulley is a set of two pulleys — one is fixed while the other can move in a linear direction.
A moveable pulley is balanced when it satisfies this equation:
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GEAR TRAIN
This is a system of more than two gears, connected together as shown in the diagram .
Each connected geared wheel rotates m the opposite direction to wheel it's attached to.
The gear ratio between the drive wheel (I) and the dnven wheel (4) depends on the number ol geared teeth m the system:
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Linear
Mechanims that transmit motion and force in a straightline from one point to another.
Examples incluides levers and fixed , mobile and compound pulleys.
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Mechanisms are devices that transmit and convert forces and motion from a driving force or imput element to an output element.
They allow us to carry out certain tacks more easily and more efficiently.
Friction drives
Friction drives are made up of two or more wheels that are in contact 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.
The output wheel rotates in the opposite direction of the primary wheel lf we use more than two wheels, each one rotates in the opposite direction to the one next to it.
The ratio between the rotation veloaty of the wheels or pulleys depends on the relative size of the weels. It is expresed by the following equation: f N,· D, = N, · D1 --- D1/D2 = N2/N1
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PULLEYS WITH BELTS
They consist of two pulleys or wheels that are a certain distance apart.Their axles are parallel and they rotate simultaneously due to the effect of the belt.The rotation of one axle is transmitted to the other through the connected pulleys.
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WORM GEAR
This is a screw that moves a helical cogwheel that is set perpendicular to the screw Each time the screw rotates, the gear moves forward as many teeth as there are grooves in the screw, usually a small number I, 2 or 3
This is used to reduce velocity as well as functioning as a brake system.
The gear between the drive pulley 1 and the driven pulley 4 depends on the relative size of the pulleys in the system. It´s expressed as a function of their diameters
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