Grotnes Machine Works, Inc.

Demetrios J Rigas

Vernon R Fencl

Method and apparatus for single plane, balance determination of cylindrical parts and the like, particularly adapted for use with determining imbalance of unmounted tires. The tire to be tested for balance is supported for rotation about a horizontal axis and driven in a substantially constant slow speed while torque monitoring means generates an output proportional to the variations in torque resulting from driving of the support means, electrical signal conversion means determines the magnitude of imbalance as being one half the difference between the maximum and minimum torque output values which is shown on a visual output display. A marking device is triggered to indicate the position on the tire at the instant the maximum torque output occurs to locate the position of the center of gravity on a horizontal line moving upward around the rotation axis.

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Skokie, IL, United States of America

Demetrios J Rigas