Vertical balance testing machine in which a motor (21), (30) is held vertically with springs (32) so as to be capable of vibrating in the horizontal plane, the vibrations of the motor (21), (30) are detected by a vibration detector (34) for measuring the balance of a testpiece (23) being tested on a rotor (21), thereby eliminating the conventional belt drive and thus eliminating any reduction in the S/N ratio of the signal of the detected vibrations by removing the irregular vibrations of the belt and the free vibrations of the spring system due to the belt tension.
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