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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 to Cadillac Motor Car Co. regarding the despatch and machining instructions for Aluminium Tin Bearing Alloy.

Identifier  ExFiles\Box 115\1\  scan0308
Date  23th March 1937
  
1020.

March 23rd 1937.

Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}1/AP.

Mr.T.Arnold,
Cadillac Motor Car Co.,
Detroit,
MICHIGAN U.S.A.

Dear Sir,

In response to a request by Mr.Robotham, we are preparing some Aluminium Tin Bearing Alloy which will be despatched to you during the next 2 or 3 days.

There will be 3 bars, 5 1/2" long by 2 3/4" outside diameter, the internal bore being 1 3/4" at the large end and approximately 1" at the small end, this we have left as cast for your machining.

As we presume that you will make a set of bearings from this material, the following heat treatment should be given when the bearings havebeen roughly machined.

This consists of 12 hours at a constant temperature of 160° - 180° C. and then finished machining carried out.

The running clearance which has been found most satisfactory with this material is 1 thou. per inch dia. for big end bearings and 1 1/2 thou. per inch dia. for main bearings.

Yours faithfully,

FOR ROLLS-ROYCE LTD.
  
  


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