The FRICTION range enables clear and comprehensive learning of FRICTION and TRIBOLOGY covering a variety of theories and topics. An understanding of the way in which Friction acts is  fundamental when studying the application of loads on a variety of surfaces. The FRICTION range forms a comprehensive set of equipment, from simple inclined planes to complete Tribology Trainers suitable for demonstration and experimental work.



HFN6 Bearing Friction Apparatus

This experiment provides an opportunity to study the efficiency of journal bearing friction over a range of commonly used materials. The wall mounted apparatus consists of a flywheel on a horizontal shaft carried in a pair of similar bearings, the flywheel being used to even out small variations in friction. The shaft is of mild steel, and interchangeable bearings in a range of materials are provided. For comparison a ball or roller bearing is available to demonstrate the advantages of rolling rather than sliding contact. Torque is applied by a loaded cord wrapped round the flywheel shaft. A set of calibrated weights and load hanger is supplied for loading the flywheel.

HFN8 Rope Belt Friction Apparatus

The apparatus consists of a wall mounted fixed pulley with a loaded belt. Four different pulleys are supplied with different vee groove angles; flat rim, 120°, 90°, and 60°.

A load is added to one of two hangers until the rope just begins to slide. This is the datum condition. Loads are now added to both sides of the rope to cause very slow sliding of the rope. This enables the coefficient of friction to be obtained.

HFN9 Friction of Belts Apparatus

The apparatus consists of a wall mounted pulley with a loaded belt. The pulley is made of aluminium and has two machined grooves to suit a flat and a vee belt. Each belt fits into its respective groove during testing. For a given belt tension and angle of lap, a turning moment can be applied by adding weights to the pulley drive hanger. The student determines the torque which just causes the pulley to turn, and so find the ratio of the belt tensions. This enables the belt tension equation to be verified and the coefficient of friction to be determined. The angle of lap can be easily varied by placing one end of each belt at different angular positions on the wall bracket. A removable pin and bar are used to enable the various angular positions to be achieved. A set of calibrated weights and hangers is supplied to achieve the loadings desired.

HFN11 Brake Drum Friction Apparatus

Students can compare the braking effect of a leading and trailing shoe with this apparatus. In addition the coefficient of friction for the brake lining on the drum can be evaluated. At one end of a baseplate is a pair of bearing brackets carrying an aluminum alloy brake drum on a shaft. The bracket on the open side of the drum provides the bottom pivot for a brake shoe and another for a 1 : 1 lever actuator at the top of the shoe. A cord from this lever passes over a pulley at the other end of the baseplate and then down to a load hanger. This creates a braking load to the system. A groove on the outside of the brake drum has an attached cord which may be wound round in either direction, thus providing a rotational torque. The cord passes over a second pulley at the far end and then down to another load hanger. To simulate a trailing shoe the cord comes from the top of the drum; for a leading shoe it comes from the underneath.

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