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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).
Letter from the Experimental Dept. to Vandervell Products Ltd. regarding journal crank and thrust washer dimensions.

Identifier  ExFiles\Box 115\2\  scan0405
Date  20th January 1939
  
1020

c. HPS.{Horace Percy Smith - Experimental Factory Mgr}

Experimental Dept.

Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}7/MH.{M. Huckerby}

20th. January, 1939.

Messrs. Vandervell Products Ltd.,
Western Avenue,
Park Royal,
LONDON, W.3.

For the attention of Mr. Johnson.

Dear Sirs,

Regarding the 2.75 dia. journal crank (L.1118) which we are testing out with your bearings in conjunction with the thrust washers EXS.1342, we find that the centre web is not wide enough to keep to your dimensions to retain the thrust washers.

We propose, therefore, that on this one unit we reduce the dimensions of the case from 1.686 - 1.687 to 1.600-1.601, which means that we shall have to make up by thicker thrust washers .137 thickness.

In view of this will you please make up and send us 4 sets of thrust washers .137 thickness, otherwise as EXS.1342.

Our drawing of the crank damp bush B.2301, has been mislaid and we would be obliged if you could supply us with another.

Yours faithfully,

for ROLLS-ROYCE LTD.
  
  


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