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Mechanisms - Coggle Diagram
Mechanisms
Pulleys
Fixed pulleys
A fixed pulley is balanced when the efford,F, is equal to the loas,R: F=R
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Compound pulleys
This is a set of fixed and moveable pulleys, often called a block and tackle. If we use more pulleys it become more complex, but less efford is needed to move the load
Rotary motion mechanisms
Friction drive
- This is made up of two or more wheels that are in contact
- Wheel(1) Is called the primary drive wheel. When it moves, it turns or drive the output wheel(2), causing it move as well
- The output wheel rotates in the opposite direction to the primery wheel
The radio between the rotation veocities of the wheels or the pulleys depends on the relative size of the wheels. It is expressed by this equation: N1 x D1 = N2 x D2 -- D1/D2 = N1/N2
Pulleys with belts
- These are two pulleys or wheels that are a certain distance apart
- Their axels are parallel and they rotate simultaneously because of the belt
- The rotation of one axle is transmitted to the other via the connected pulleys
- The two pulleys rotate in the same direction
Linear motion mechanisms
Levers
The lever is a balanced when the effort F, multiplied by its distance d is equal to the load R multiplied by its distance from the fulcrum r. This is called the law of the lever, wich is expressed by this equation: F x d = R x r
Types of levers
Class 1
- The load and the effort are on opposite sides of the fulcrum
- The effect of the applied can be multiplied or reduced
Class 2
- The load is between the efford and the fulcrum
- The load of the effort is always multiplied
Class 3
- The effort is between the fulcrum and the load
- The effect of the efford is always reduced