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 Hardy Spicer & Co. regarding the analysis of a star centre from a joint after a dynamometer test.
| Identifier | ExFiles\Box 148\4\ scan0080 | |
| Date | 14th September 1938 | |
| 1262 Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}12/MH.{M. Huckerby} 14th. September 1938. J.A.Daniell, Esq., Messrs. Hardy Spicer & Co. Ltd., Witton, BIRMINGHAM. Dear Mr.Daniell, We are sending you the star centre of one of the latest type joints that has run a dynamometer test. On this occasion there has been no shortage of lubricant. Tests we have made on the bearing surface show that the hardness is now only Rockwell C 55-59 or 700-746 VPN/30 and c44-689 VPN/5. The case is also only .030 deep. We wonder whether the surface has softened with running or whether it got through below par, and whether the case is under the correct thickness. In our opinion .062 would be a more suitable amount. We look forward to your views on this subject. Kind regards, Yours sincerely, | ||