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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).
Hardness testing results of a Wraith steering roller.

Identifier  ExFiles\Box 9\7\  07-page161
Date  31th March 1938
  
650
Mr.Hardy......from RHC{R. H. Coverley - Production Engineer}/EG.
c. to RHC{R. H. Coverley - Production Engineer}/Cy.
RHC{R. H. Coverley - Production Engineer}/EG.8/DB.{Donald Bastow - Suspensions} 31.3.38.
Wraith Steering.
Messrs. Hoffmann.
R.H.
The roller handed to me by RHC{R. H. Coverley - Production Engineer}/Cy., has been sectioned and carefully checked on Rockwell and Vickers machines, and the results obtained by Messrs.Hoffmann are confirmed within very close limits with loads of 10 x 30kgs. on the Vickers machine, our figures being 752 and 763 respectively.
The surface is rather soft, probably due to grinding softening, and gives a figure of 713 with a 5 kg. load, although the actual surface hardness would hardly be so high as this, but unfortunately I have no means at my disposal, to give actual surface hardness figures.
Goodall
RHC{R. H. Coverley - Production Engineer}/EG.
  
  


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