• Influence of angle of contact, coefficient of friction and belt force (Eytelwein’s rope friction formula).
  • Comparison flat belt-V-belt, round belt.
  • Consequences of an incorrectly aligned belt.


  • Experiment on belt friction and belt drives.
  • Portable experimental unit with metal stand 1 flat belt, 1 V-belt and 1 round belt.
  • Ball bearing mounted belt pulley with three different belt grooves.
  • Angle of contact of the belts 30o…210o, graduations 30o.
  • Force measurement using 2 calibrated weights.Ball bearing mounted belt pulley with three different belt grooves.

This apparatus is designed to find out the co-efficient of friction of different types of belts. Belts are one of the means of transferring energy between objects. The performances and usage of different belts is directly effected by friction. If the friction is too high, a big part of energy will be wasted to overcome that friction and the belt will undergo a lot of wear as well. On the other hand, if there is low friction between belt and pulley slippage can occur. This apparatus consists of a pulley that is fitted on a frame. The pulley has grooves so different belts can be attached. Belts are passed over the pulley at the required angle and then some load is applied on the belt by using a hangar. The pulley is then made to rotate against that load by the help of a cord which has a hanger and weights on its one end.