Rolls-Royce Archives
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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).
Laboratory report on cracked Bentley bearings, linking failure to high carbon steel backs and recommending lower carbon steel.

Identifier  ExFiles\Box 114\2\  scan0183
Date  20th September 1935
  
Rm.{William Robotham - Chief Engineer}
c.R.H.C.
Rm{William Robotham - Chief Engineer} X1020
Laboratory.
20.9.35.
Two Bentley bearings in the Aluminium Tin Alloy which have showed transverse cracks were found to have steel backs high in Carbon i.e. (0.33 to 0.36%). This has caused poor adhesion. Thus bad adhesion as well as blowholes are liable to occur with high carbon steel. This confirms the importance of using steel with not more than 0.25% carbon, L.C.M. steel for instance.
Hl. He
  
  


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