AN INVESTIGATION OF SPIN AXIS INSTRUMENT BEARINGS.
ALLOYD RESEARCH CORP WATERTOWN MASS
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As a part of the program undertakenn in this laboratory, aimed at the development of better materials for spin-axis instrument bearings, there has been underway a continuous investigation into the causes of failure of spin-axis bearings. The examination of these bearings have indicated two distinct types of bearing failure Metal failure and lubrication failure. The method commonly employed to examine bearing components for dirt and foreign matter, is visual inspection using a stereo microscope at magnification of twenty to forty times with a standard light source. In an attempt to improve the resolution, for inspection of the bearing surfaces, other microscope techniques were tried such as dark field, interference microscopy, and polarized light. It was found that polarized light revealed particles on the surfaces of bearings which were transparent and, therefore, invisible by other lighting techniques.