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Evaluation of ball and roller bearings restored by grindingA joint program was undertaken to restore by grinding those rolling-element bearings which are currently being discarded at aircraft engine and transmission overhaul. Three bearing types were selected from the UH-1 helicopter engine (T-53) and transmission for the pilot program. Groups of each of these bearings were visually and dimensionally inspected for suitability for restoration. A total of 250 bearings were restored by grinding. Of this number, 30 bearings from each type were endurance tested to a TBO of 1600 hours. No bearing failures occurred related to the restoration by grinding process. The two bearing failures which occurred were due to defective rolling elements and were typical of those which may occur in new bearings. The restorable component yield to the three groups was in excess of 90 percent.
Document ID
Document Type
Conference Paper
Parker, R. J. (NASA Lewis Research Center Cleveland, OH, United States)
Zaretsky, E. V. (NASA Lewis Research Center Cleveland, Ohio, United States)
Chen, S. M. (NASA Lewis Research Center Cleveland, Ohio; U.S. Army, Aviations Systems Command, St. Louis, Mo., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1976
Subject Category
Distribution Limits