School of Physics Lecture Demonstration Manual

Mi-9 Knife Edge Gyroscope

Published: Thursday 09 March 2006 - Updated: Thursday 24 March 2011


To demonstrate the inherent stability of a gyroscope



Click on pictures to enlarge.

Knife Edge Gyro Pic 1

Knife Edge Gyro Pic 2


Knife Edge Gyro


A gyroscope mounted on a knife edge support will balance on the knife edge once it is rotating at sufficient speed. The gyroscope is brought up to speed by means of the gyroscope spinner, an A.C. motor with a rubber wheel attachment. Any slight inbalance in the gyroscope will cause it to precess. The gyroscope should be returned to its wooden support base when not in use to protect the knife edge .

Safety notes

Electrical Safety 


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