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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison of frictional torques between a Hoffmann journal bearing and an R & M double thrust bearing.

Identifier  ExFiles\Box 94\2\  scan0052
Date  2nd November 1936
  
Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}

FILE X328

2.11.36.

BALL BEARING THRUST TESTS

_G.56227 HOFFMANN_ _GB.2035 R.{Sir Henry Royce} & M.{Mr Moon / Mr Moore}_

To compare the relative merits of the above as thrust bearings (the Hoffman bearing was an ordinary journal type), whilst the R & M.{Mr Moon / Mr Moore} was a double thrust type bearing) the outer races were fixed, and a dead load of 3000 lbs. applied to the inner race of each type of bearing.

The frictional torques measured under these conditions were:-

GB.2035 R & M.{Mr Moon / Mr Moore} 12 lbs.ins.
G.56227 Hoff. 19.5 lbs.ins.

W.Bell.
  
  


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