An ex perime ntal program has been conducte d to compare th e cffective lives of ball bearings operat ing in vacuum with various types of MaS, solid film s, an d with a special high vacuum oil, as lubrican ts. The test bearings u'ere size 205 bearings runn ing at 30 rpm under a ten-pound radial load . T wo parti cular com binati ons were also ev aluated in oscillating motion tests. Torque was used as th e criterion fo r failure. Prior to test th e bearings Il' ere subjec ted to a f2 100-pound static load to simulate laun ch loading . Th e results of th ese t ests showed that mo st of th e solid film -lubri cat ed bearings were effecti ve fur th e first sev eral hun d red hours, th en gave high and erratic torq ue values as th e result of deb ris being formed by wear of th e lubl'ican t film. A sodiu m -silicate bonded solid lubricant film, which con tained MaS, and graphite, was fo und to be partic ularly promising in both rot ation and oscillation. One partic ularly significan t result of this u -ork was th e finding that th e oil-lub ricat ed bearings showed a sudden , large increase in to rque aft er running effective ly fo r about 1400 hours in vacuum. This behavior has oft en been predicte d but has appar ently n ever bccn observed cxperim entallu, at least fo r rollinq-con tart hearings.
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