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Mechanisms (Rotary motor mechanisms (Friction drives (Made up of two or…

- - - - N1 and N2 are the velocities of the wheels. (RPM)
        D1 and D2 are the corresponding diameters. (Usually mm)
        
        N1 · D1 = N2 · D2 → D1 : D2 = N2 : N1
  - - - Their axles are parallel and they rotate simultaneously due to the effect of the bell, the rotation of one of the axes is transmitted to the other through the connected pulleys.
  - - - The cogs fit into the spaces between the cogs of another wheel, so that one wheel moves the other.
        
        N1 · Z1 = N2 · Z2 → Z1 : Z2 = N2 : N1
  - - - Each time the screw rotates, the gear moves forward as many teeth as there are grooves in the screw, usually a small number , 1, 2, or 3.
        
        Nwheel = Nscrew · Zgrooves : Zwheel
  - - - The chain transmits the rotary moton of axle I to axle 2 by means of gears one and two, and the two gears rotate in the same direction.
        
        N1 · Z1 = N2 · Z2 → Z1 : Z2 = N2 : N1
  - - - The rotary motion of the first wheel (1) drives the second wheel (2), and so on.
        
        N4 : N1 = Z1 · Z3 : Z2 · Z4
  - - - N4 : N1 = D1 · D3 : D2 · D4
- - - - Fulcrum between the effort and the resistance
      - Resistance between the fulcrum and the effort
      - Effort between the fulcrum and the resistance
  - - - Balanced if F = R
    - - Balanced if F = R : 2