The inertial guidance of airplanes and missiles has focused attention on the subject of friction torque of instrument ball bearings. Several years ago the Department of Defense undertook the task of standardizing the rating of the motion-resisting torque of such bearings, and the development of a tester for this purpose. This paper briefly discusses the Mil-Std-#206 torque tester, the interpretation of its results, and some of the frictional properties of instrument antifriction bearings. A cutaway illustration shows the arrangement of configuration of the tester; and a schematic of the system, with the related description, explains the principle of operation. Also a typical torque trace from the tester is reproduced and analyzed.

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