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GL 112 Cam Analysis Apparatus
Education / GUNT Hamburg / Engineering Mechanics and Machine Elements / Fundamentals of Engineering Design /

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 
- 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 speed control
[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: 5026N/m
- medium: 2601N/m

- soft: 613N/m

- additional weight: 200g

- tappet: 530g

- flat tappet: 93g

- roller: 20g
Plotter: synchronous belt drive
Optical speed sensor


Dimensions and Weight

l x w x h: 800x435x440mm (experimental unit)

l x w x h: 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

Order Details
030.11200  GL 112  Cam Analysis Apparatus