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Mechanisms (They have diverse uses: (The most important element in all of…

- - - - • F is the force or effort appbed at one end of the bar.
      - • R i s the resistance or load which acts at the other end of the bar.
      - • d i s the distance from F to the fulcrum
      - • r is the distance from R to the fulcrum
    - - class 2
        
        The resistance is between the fulcrum and the effort applied
      - class 3
        
        The effort apphed is between the fulcrum
        and the reristance.
      - class 1
        
        The fukrum is between the effort applied and the resistance
- - - - Function 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
    - - They consist of two pulleys or wheels that are a certain distance apart.
    - - Cogwheels are sets of wheels that have teeth called cogs.
      - They transmit a rotary motion between the two connected axles, which can be parallel, perpendicular or oblique
      - Gears can be cyhndncal or conical
      - The ratio between the rotation veloaues of the wheels depends on the
        number of teeth on each wheel. It's expressed by this equation:
    - - 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
    - - 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.
    - - This is a system of more than two gears, connected together as shown in the diagram
    - - Look at the diagram below. It's a system of pulleys, or wheels, with a belt formed by more than two wheels.
      - Variation in velocity
        
        Multiplying system
        
        Constant system
        
        Reducing system
- - - - In bushings the axle or the shaft is inserted in a plain circular piece
        that is placed inside a housing to provide a bearing surface.