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Mechanisms - Coggle Diagram

- - - - Levers
        
        F is the force or effort applied at one end of the bar.
        
        R is the resistance or load which acts at the other end of the bar
        
        d is the distance from F to the fulcrum
        
        r is the distance from R to the fulcrum
        
        Law of the lever: F x d = R . r
        
        Classes
        
        Class 1
        
        The fulcrum is between the effort applied and the resistance. the effect of the effort applied can be multiplied or reduced.
        
        Class 2
        
        The resistance in between the fulcrum and the effort applied. The effect of the effort applied is always muitiplied (d > r(.
        
        Class 3
        
        The effort applied is between the fulcrum and the resistance. The effect of the effort applied is always reduced (d < r).
      - Pulleys
        
        Fixed Pulley
        
        A fixed pulley is balanced when the effort F is equal to the resistance of the load, R.
        
        F = R
        
        Movable pulley
        
        A moveable pulley is balanced when it satisfies this equation: F=R/2
        
        Compound pulleys
    - - Friction drives
        
        The ratio between the rotation velocity of the wheels or pulleys depends on the relative size of the wheels. N1 x D1 = N2 x D2.
      - Pulleys with belt
      - Gear mechanisms and cogwheels.
        
        The ratio between the rotation velocities of the wheels depends on the number of teeth on each wheel. It's expressed by this equation: N1 x Z1,=N2 x.Z2
      - Worm gear
        
        A worm screw fulfils this equation: Nwheel = Nscrew x Zgrooves/ Nwheel
      - Gear mechanisms with a wheel
        
        The ratio between the rotation velocities of the wheels depends on the number of teeth on each gear. It's expressed by this equation: N1 x Z1,=N2 x.Z2
      - Gear train
        
        The gear ratio between the drive wheel (1) and the dnven wheel (4) depends on the number ol geared teeth m the system: N4/N1 = Z1-Z3/Z2-Z4
      - Pulley trains with belts
        
        The gear ratio between the dnve pulley (1) and the dnven pulley l4) depends on the relative size of the pulleys in the system. It's expressed as a function of their diameters: N4/N1 = D1-D3/D2-D4
  - - - Rack and pinion system
        
        The ratio between the number of rotations of the pinion and the veloaty of the movement of the rack is expressed by this equation: L= PxZxN
        
        • L is the velocity of the rack's movement in millimetres per
        minute.
        
        P is the distance between two consecutive teeth in millimetres.
        
        • Z is the number of teeth in the pinion.
        
        • N is the number of rotations per minute of the pinion
      - Nut and bolt system
      - Winch and crank handle
        
        A winch is balanced when it satisfies this equation: FxD=Rxr
    - - Crank-link-slider
      - Crankshaft
      - Cam
      - Eccentric cam