Abstract
Abstract This paper describes tests in which flat-faced pieces of several bearing metals were mounted to ride on a small journal which was lubricated by means of an oil bath. The initial lines of contact gradually developed into grooves until viscous oil films formed between the rubbing surfaces and arrested further wear. The minimum thickness of these wedge-shaped oil films were computed from observations made with tin-base, lead-base, bearing-bronze, and leaded-copper bearing metals, each being tested under loads of 20, 40, and 60 lb per sq in., respectively. It is shown that the film thickness is substantially independent of the load for any one individual material, ranging from 0.00003 in. to 0.00006 in. Photomicrographs of the surface structures of the bronze and tin-base babbitt are shown, which permit measurement of the height of excrescences. These measurements compare favorably with the computed values of minimum oil-film thickness. The observations are correlated with those given by McKee (6) obtained on the running in of small bearings. The effect of different oils on the running in of babbitt is also indicated.
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