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Friction Study of Brake Drum
(DN - 011)

1 Brake Drum 2 Cords 3 Pulleys 4 Load Hangers 5 Additional Weights

  • To determine experimentally the variation of tangential force with braking load.
  • To obtain the coefficient of friction between the aluminum drum and the brake shoe.
  • To compare leading and trailing shoes.
  • brake drum inner diameter: 110 mm
  • brake drum outer diameter: 150 mm
  • weight hanger
  • weights
    • 0.5N
    • 1N
    • 2N
  • Friction Study of Brake Drum (DN - 011)
  • Hard copy user manual

The Brake Drum Friction Apparatus (DN – 011) is a benchtop brake drum apparatus with single leading and trailing shoe. The apparatus provides drum torque and braking load applied by weight hangers and cords.

  • An aluminum brake drum is secured to one end of a sturdy bench top mounted base.
  • The drum has an external cord grooved and its inside face is machined to plain aluminum.
  • A cord is wrapped around the perimeter of the brake drum and the free end of the cord runs over a pulley at the other end of the base and terminates with a load hanger.
  • Torque is applied to the brake drum by using the calibrated weights set provided and the load hanger.
  • Mounted inside the brake drum is a single brake shoe with its own pivot.
  • A second cord connects to the brake shoe and again runs over a pulley and terminates at the load hanger.
  • As the load is applied to the brake shoe so that friction force increases.
  • Load must be added to the torque hanger, then try and rotate the brake drum at near constant speed.
  • The sense of rotation of the torque determines whether the single brake shoe acts as a leading or trailing shoe.
  • Direct comparison of tangential force and braking load is obtained and the coefficient of friction determined.