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GL 112 Investigation of cam mechanisms



  • 4 different cams, 2 different tracers
  • Influence of spring rigidity and moving mass
  • Plotting of lift curves
  • Excellent observation of movement process


Technical Description

The GL 112 allows the dynamic investigation of cam mechanisms, as used in motors for actuation of the valves. The cam mechanism consists 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. A plotter allows the actual lift curves to be recorded. The open design allows the observation of every detail of the movement process. A stroboscope (not supplied) can be used to provide a particularly impressive view of the movement process and lift.

The experimental unit is intended for demonstration purposes in technical education. It is not suitable for use as a test stand for fatigue testing.

Learning Objectives / Experiments

- 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


[1] experimental unit for investigation of cam mechanisms
[2] 4 cams: tangent, hollow cam, 2 circular cams with different head radius 
[3] tappet with 2 different tracers: flat or roller tappet 
[4] 3 interchangeable restoring springs
[5] electric motor with variable speed 
[6] moving mass with can be lifted with 5 additional weights; attached to tappet 
[7] mechanical drum plotter with plotting spring and coated paper 

Technical Data
Three-phase asynchronous motor with frequency converter
- power: 250W
- speed: 60…670min-1
- 15mm lift
- opening angle: 140°
Spring rigidity
- hard: 5.026N/m
- medium: 2.601N/m
- soft: 613N/m
- additional weight: 200g
- tappet: 530g
- flat tappet: 93g
- roller: 20g
Plotter: synchronous belt drive
Optical speed sensor

Dimensions and Weight

LxWxH: 800x435x440mm (experimental unit)
LxWxH: 360x315x160mm (display and control unit)
Weight: approx. 68kg
Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 experimental unit
1 display and control unit
4 cams
2 tracer
3 restoring springs
3 blocks of plotter paper
1 combination wrench
1 hexagon screwdriver, short
1 manual

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