• Comparison of different cam forms.
  • Lift curves for non-matching tracer.
  • Lift curve for skipping tracer.
  • Determination of limit speed and comparison with theory.
  • Influence of moving mass.
  • Influence of restoring spring rigidity.


  • Experimental unit for investigation of cam mechanisms.
  • 4 cams: tangent, hollow cam, 2 circular cams with different head radius.
  • Tappet with 2 different tracers: flat or roller tappet 3 interchangeable restoring springs.
  • Electric motor with speed control.
  • Moving mass with can be lifted with 5 additional weights; attached to tappet.
  • Mechanical drum plotter.

This unit is used to study the phenomenon of CAM Mechanisms. A CAM shaft receives motion from a motor using a coupling that is installed on a rigid base. A mass and spring are used to simulate the value, a plotter permits the actual lift curve, and a stroboscope (optional) can be used to view the movement process and lift. The CAM is made up of 4 interchangeable CAM plates and 2 different tracers.A mass and a spring are used to simulate the valve. In order to demonstrate the so-called “valve wobble”, the spring rate, mass and speed are adjustable within broad limits. The real lift curves can be recorded using a plotter. The open layout makes it possible to see every aspect of the movement process. To get a particularly stunning view of the movement and lift, a stroboscope (Optional) can be used. The experimental unit is designed to serve as a technical education demonstration instrument.