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MECHANISMS (Rotary motion mechanisms (Pulley trains with belts (Va riation…

- - - - R i s the resistance
      - d i s the distance from F to the fulcrum
      - F is the force
      - r is the distance from R to the fulcrum
      - F d= f r
        It's called the law of the lever.
    - - Class 2
        
        The resistance i s between the fulcrum and the effort applied.
        
        The effect of the effort applied is always multiplied
      - Class 3
        
        The effort applied is between the fulcrum and the resistance
        
        The effect of the effort apphed is always reduced
      - Class I
        
        The fulcrum is between the effort applied and the resistance
        
        The effect of the effort applied can be multiplied or reduced
- - - - Whe n the wheels and the gears have the same diameter or the same
        number of teeth, they rotate at the same velocity.
        • Whe n they' re different sizes, th» smallest rotates more quit.kly
      - Multiplying system
        
        velocity is increased
      - Constant system
        
        velocity remains constant
      - Reducing system
        
        velocity is reduced
- - - - This consists of a bolt or threaded bar and a nut that has the same
        intenor diameter as the diameter of the bolt
    - - A crank is a bar attached to an axle that is used to turn it .A winch and crank handle system consists of a drum that rotates and a crank handle that allows to pull or lift obiects.
      - A winch is balanced when it satisfies this equation
        
        FXD=Rxr
    - - he ratio between the number of rotations of the pinion and the velocity of
        the movement of the rack is expressed by this equation:
        L= Px ZX N
  - - - This is a set of connecting rods attached to a jointed axle. Each of theioints of the axle acts as a crank.
    - - This is basically a rotating object that pushes a follower as it movesWe can change the shape and the valve: a device that opens and closes to let hquid or gas pass usable profiles
    - - This is composed of a crank and a rod called a connecting rod or link This rod has articulated Ioints at each end — one isconnected to thecrank and the other to the slider
      - — it can transform
        reciprocating motion or oscillating motion into rotary motion This device was very important in the development of steam engines.
    - - This consists of a wheel with an off centre rotation axle that doesn't coincide with the centre of its circumference