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).
Testing and development of Solid Hall's Metal Bearings.
| Identifier | ExFiles\Box 115\1\ scan0006 | |
| Date | 6th January 1936 | |
| X1020 To RHC.{R. H. Coverley - Production Engineer} c. to Hl. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/EW.6.1.36. Solid Hall's Metal Bearings. We have now established that with .0005" greater clearance than white metal we can get 7% tin Hall's metal bearings to give excellent results. Our objective now is to get this material to work with white metal clearance. We are adopting two lines of attack - (1) Asking you to investigate the shape of the white metal bearings after they have run endurance and to see if it is practicable to make main bearings to this shape initially. (2) Slightly softening the 7% tin alloy to see if it will then accommodate itself better to the crankcase distortion. Will you please hand 2 sets of 7% alloy bearings to Hl. in part machined condition so that he can anneal them and bring the Brinell figure down from the present 48 to 40. These bearings should be very clearly marked, and when available we will allot an engine for test. We believe that some 10% tin bearings have previously been instructed, but for the time being we do not wish these to be proceeded with. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||