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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).
Report from a bearing company detailing five comparative tests on bearings under different lubrication and material conditions.

Identifier  ExFiles\Box 114\2\  scan0032
Date  6th April 1934
  
RANSOME & MARLES BEARING Co., Ltd.
- 2 -

Messrs. Rolls-Royce, Limited,

D E R B Y .
6-4-34.

row of balls taking thrust loads, and one row
taking journal loads, the thrust being 2840 lbs.
and the journal 2100 lbs. Lubrication was by
'D.T.E.' Heavy oil and wick feed, and after five
hours' run, failure of the cage occurred owing
to insufficient lubrication.

SECOND TEST :

An identical bearing to that used for the
first test, and under the same loading conditions,
was run but with a continuous supply of oil
(this being Rust-Veto) and this ran for thirty-nine
hours, at which time slight overload failure was
evident.

THIRD TEST :

The modified MDJT.30 bearing, our 3/MDJT.30
fitted with a brass cage was run under identical
conditions to the second test, for one hundred hours,
the condition being in every way satisfactory.

FOURTH TEST :

An identical bearing to that used for the third
test, but fitted with a steel cage and lubricated by
a continuous supply of Whitmore oil was run for a
period of nine hours, at which stage, excessive wear
of the outside diameter of the inner occurred, due
to cage friction.

FIFTH TEST :

This test was instituted to ascertain the
  
  


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