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Mechanisms, Band brakes consist of a metal band that puts pressure on a…

- - - - D1/D2=N2/N1
  - - - Z1/Z2=N2/N1
  - - - N wheel= (N screw x Z groves) / Z wheel
  - - - N1 x Z1 = N2 x Z2 ------> Z1/ Z2 = N2/N1
  - - - N4/ N1= (Z1 x Z3) / (Z2 x Z4)
  - - - N4/N1= (D1 x D3) / (D2 x D4)
    - - Multiplying system
      - Constant system
      - Reducing system
- - - - The ratio between the number of rotations of the pinion and the velocity of
        the movement of the rack is expressed by this equation:
        
        L= P x Z x N
    - - Uses: presses, taps, car jacks, screw tops for bottles
    - - A winch is balanced when it satisfies this equation
        
        F x d = R x r -------> F= R x (( R x r) / d)
  - - - Uses: internal combustion engines, windscreen wipers and machine tools.
    - - Uses; combustion engines and sewing machines
    - - Uses; combustion engines (it regulates the automatic opening and
        closing of the valves that let fuel and gases in and out), automatic systems
    - - Uses: sewing machines, windscreen wipers.
- - - - Class1
      - Class 2
      - Class 3
    - - A fixed pulley is balanced when the effort F is equal to the resistance of the
        load.
        
        F=R
    - - A moveable pulley is balanced when it satisfies this equation
        
        F=R/2
    - - This ts a system of fixed and moveable pulleys, often called block and
        tackle
        
        n= the number of movable pulleys