Apparatus For Studying Ball Spinning Friction

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Apparatus For Studying Ball Spinning Friction

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Author : Steven T. Miller
language : en
Publisher:
Release Date : 1965

Apparatus For Studying Ball Spinning Friction written by Steven T. Miller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Ball-bearings categories.

An experimental apparatus was designed and constructed at the NASA Lewis Research Center to study one aspect of spinning friction based on interfacial slip over the entire ball-race contact area. The apparatus is capable of measuring spinning moments of less than 0. Ol inch-pound at maximum Hertz contact stresses to over 400 000 psi, speeds to 3500 rpm, and under varying contact configurations and conditions. From the torque measurement, a coefficient of spinning friction can be calculated. The apparatus comprises a drive assembly, a dead-weight load assembly, a spherical upper test specimen, a cylindrically grooved lower test specimen of varying conformity, a lower test specimen housing assembly incorporating a hydrostatic air-bearing assembly, and a torque-measuring system. In operation, the upper test specimen is loaded against the lower test specimen through the drive shaft assembly by the dead- weight load assembly. As the drive assembly is rotated, the upper test specimen rotates against the stationary lower test specimen actuating the torque-measuring system. Preliminary tests were conducted under varying Hertz stress to 136 000-psi maximum Hertz stress at a spinning speed of 950 rpm, with a 51 percent ball-groove conformity using a polyphenyl ether (5P4E), a highly purified naphthenic mineral oil, and a di-2-ethylhexyl sebacate (MIL-7808). It was found that the coefficient of spinning friction decreased with increasing maximum Hertz stress to an intermediate stress level and had a minimum value of 0. 122, 0. 089, and 0. 050, respectively, for the lubricants listed previously.

Speed Effects On Ball Spinning Torque

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Author : Dennis P. Townsend
language : en
Publisher:
Release Date : 1969

Speed Effects On Ball Spinning Torque written by Dennis P. Townsend and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Ball-bearings categories.

Elastohydrodynamic analysis and experimental speed effects on ball spinning friction coefficients and torque.

Nasa Technical Note

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Author :
language : en
Publisher:
Release Date : 1973

Nasa Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with categories.

A Selected Listing Of Nasa Scientific And Technical Reports For

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Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
language : en
Publisher:
Release Date : 1965

A Selected Listing Of Nasa Scientific And Technical Reports For written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Aeronautics categories.

Nasa Scientific And Technical Reports

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Author : United States. National Aeronautics and Space Administration Scientific and Technical Information Division
language : en
Publisher:
Release Date : 1966

Nasa Scientific And Technical Reports written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Aeronautics categories.

Monthly Catalog Of United States Government Publications

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Author : United States. Superintendent of Documents
language : en
Publisher:
Release Date : 1965-07

Monthly Catalog Of United States Government Publications written by United States. Superintendent of Documents and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965-07 with Government publications categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1973

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Aeronautics categories.

Government Wide Index To Federal Research Development Reports

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Author :
language : en
Publisher:
Release Date : 1965

Government Wide Index To Federal Research Development Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Government publications categories.

Lubrication Corrosion And Wear

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Author : United States. National Aeronautics and Space Administration Scientific and Technical Information Division
language : en
Publisher:
Release Date : 1966

Lubrication Corrosion And Wear written by United States. National Aeronautics and Space Administration Scientific and Technical Information Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Corrosion and anti-corrosives categories.

Monthly Catalog Of United States Government Publications

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Author :
language : en
Publisher:
Release Date :

Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Government publications categories.