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).
Trial to manufacture a 0.8% carbon steel ring for Bentley rear aluminium composite brake drums.
| Identifier | ExFiles\Box 85\1\ scan0022 | |
| Date | 12th February 1936 | |
| x206 To RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}12/KW.12.2.36. Bentley Rear Aluminium Composite Brake Drums. Now that the "Millenite" ring has been successfully inserted, we would like to try a ring in 0.8% carbon steel. We would like you to try making this ring from a flat strip, bending it round to the correct diameter, and welding it, using a welding strip of the same carbon content. This should be an inexpensive method of making the ring, and is done elsewhere. After welding and before machining the ring should be 'normalized' to remove stresses. The ring should be ground on the outside so as to give a smooth surface and inserted with an interference fit of .026" to .028", the aluminium being raised to 200°C. for not morethan 5 minutes to enable this to be done. No copper plating is required. The ring during insertion should have an internal diameter of 11.900" + .020", and finished afterwards on a grinder. Hs{Lord Ernest Hives - Chair}/A.F.Martindale. | ||