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TM 625 Whirling Shaft Apparatus
Education / GUNT Hamburg / Engineering Mechanics and Machine Elements / Dynamics /

The modes of oscillation and resonances of rotors with continuous mass distribution can be clearly demonstrated using this unit. Due to the use of thin, elastic rotor shafts made of high-strength steel, the oscillatory phenomena can be easily understood. A range of shaft diameters and the free choice of the bearing arrangement make it possible to perform a wide variety of experiments. Adapters in the bearings compensate for different diameters, catch bearings limit the amplitude of the oscillation. The freedom of movement of the rotor is assured by an elastic coupling. A Laval rotor with discrete mass distribution can be assembled using a mass disc. As a supplement to this unit, a set of vibration sensors, TM 620.01, is available. These enable the path of the rotor to be displayed on an oscilloscope.

Learning Objectives / Experiments
Speed-dependent experiments on rotation
- Modes of oscillation of a rotor shaft with individual 
  masses (Laval rotor)
  * critical speed
  * self-centering
- Modes of oscillation of a continuous rotor shaft
  * for varying bearing spacing
  * for varying shaft diameter

[1] Experimental unit on critical rotational speeds on simply loaded and continuous shafts
[2] 6 rotor shafts made of high-strength steel, 
[3] Rotor disc made of steel
[4] Drive via elastic coupling
[5] Motor: adjustable speed, digitally display, adjustment with potentiometers, 2 rotational speeds can be preselected, can be switched as required
[6] Up to 4self-aligning bearings on the rotor shaft
[7] Up to 3 securing catch bearings with plastic packing can be positioned on the rotor
[8] Protective cover made of transparent plastic

Technical Data

Rotor shafts made of steel
- diameter: 3mm, 6mm, 7mm
- length: 600mm, 900mm

Rotor disc made of steel

- diamter: 80mm

- weight: 1kg


- power: 0,37kW

- speed: 0...6000min-1

- speed electronically controlled

Dimensions and Weight
l x w x h: 1550x375x355mm
Weight: approx. 65kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery

1 complete experimental unit,

6 rotor shafts

1 rotor disc

1 instruction manual

Order Details
040.62500  TM 625  Whirling Shaft Apparatus