Dynamic balancing of small gyroscope rotors

A DIRECT METHOD¹ of balancing is generally possible for any type of rotor provided it can be run in a special fixture for the measurements. However, some rotors due to large size or other restrictions can be run only on their permanent mountings and balancing usually requires more or less “trial and error” testing. On the other hand, certain rotors of the first group that are small in size and may be run in special fixtures, impose unusual obstacles which make it difficult to apply the well-known principles to produce a rational method of dynamic balancing. This paper is devoted to a description of the solution of such a balancing problem.