Download or read book EVALUATION OF TEMPERATURE AND MATERIAL COMBINATIONS ON SEVERAL LUBRICANTS FOR USE IN GEOSTATIONARY OPE NASA TM 2001 211121 DEC 6 200 written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Temperature and Material Combinations on Several Lubricants for Use in the Geostationary Operational Environmental Satellite Goes Mission Filter Wheel Bearings written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A bearing test apparatus was used to investigate lubricant degradation rates and elastohydrodynamic transition temperatures for several perfluoropolyether (Krytox) formulations, a pentasilahydrocarbon, and a synthetic hydrocarbon (Pennzane 2001 A) in an MPB 1219 bearing, which is used in the geostationary operational environmental satellite (GOES) mission filter wheel assembly. Test conditions were the following: 1000-hr duration, 75 C, 20 lb axial load, vacuum level less than 1 x 10(exp -6) Torr, and a 600-rpm rotational speed. Baseline tests were performed using unformulated Krytox 143AB, the heritage lubricant. Krytox additive formulations showed small reductions in degradation rate. Krytox GPL-105, a higher viscosity version, yielded the least amount of degradation products. Both the silahydrocarbon and Pennzane 2001A showed no signs of lubricant degradation and had ample amounts of free oil at test conclusion. Jansen, Mark J. and Jones, William R., Jr. and Predmore, Roamer E. Glenn Research Center; Goddard Space Flight Center NASA/TM-2001-211121, E-12970, NAS 1.15:211121
Download or read book Evaluation of Temperature and Material Combinations on Several Lubricants for Use in Geostationary Ope NASA written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Temperature and Material Combinations on Several Lubricants for Use in the Geostationary Operational Environmental Satellite GOES Mission Filter Wheel Bearings written by and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Grease Type Ball Bearing Lubricants Operating in Various Environments written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because many future spacecraft or space stations will require mechanisms to operate for long periods of time in environments which are adverse to most bearing lubricants, a series of tests is continuing to evaluate 29 grease type lubricants in R-4 size bearings in five different environments for a 1 year period. Four repetitions of each test are made to provide statistical samples. These tests have also been used to select four lubricants for 5 year tests in selected environments with five repetitions of each test for statistical samples. At the present time, 65 test sets have been completed and 23 test sets are underway. Two (5 year) tests have already been started in (1) continuous operation and (2) start-stop operation, with both in vacuum at ambient temperatures. To date, in the 1 year tests, the best results in all environments have been obtained with a high viscosity index perfluoroalkylpolyether grease. Mcmurtrey, E. L. Marshall Space Flight Center NASA-TM-78162, SR-3 ...
Download or read book COMPARISON BETWEEN OIL MIST AND OIL JET LUBRICATION OF HIGH SPEED SMALL BORE ANGULAR CONTACT BALL BEARING NASA TM 2001 210462 DEC 6 written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Evaluation Of A Modified Chrome Oxide Based High Temperature Solid Lubricant Coating For Foil Gas Bearings NASA TM 1998 208660 Dec 3 1998 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
