Method and apparatus for measuring the imbalance of a bowling ba

Details Method and apparatus for measuring the imbalance of a bowling ba Method and apparatus for measuring the imbalance of a bowling ba

1979-07-31

1980-11-18

Gill, James J.

Measuring and testing

Rotor unbalance

Dynamic

73471, 73483, G01M 104, G01M 116

Patent

active

042338468

ABSTRACT:
An apparatus for measuring the imbalance of a bowling ball includes a base, a first gimbal rotatably mounted on the base and a second gimbal rotatably mounted on the first. A ball is supported by the second gimbal and spun while having the same orientation it has when in flight. The ball acts as the rotor of a gyroscope and any imbalance causes precession in the form of rotation of the first gimbal. Indicators carried by the first gimbal and the base aid in observing the direction and rate of precession.

REFERENCES:
patent: 3156067 (1964-11-01), Malko

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