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 the Manganese Bronze & Brass Co. Ltd. concerning spindle wear, material specifications, and hardness figures for various components.
| Identifier | ExFiles\Box 85\1\ scan0328 | |
| Date | 23th April 1937 | |
| 206 23rd April 1937 Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}2/AP. Your Ref. ER/SV. The Manganese Bronze & Brass Co.Ltd., Handford Works, Ipswich, SUFFOLK Dear Sirs, We have noted your report of 19th April and agree that as the wear of the spindle is so considerable we will have to caseharden. We have never found it necessary to use anything other than M.S. in such cases previously. The steel shaft on the 3 litre Bentley would probably be M.S. but we are not certain as we did not make this car. (1) The specimen balance lever you examined was an early sample made in aluminium bronze. On 4¼ lite production we now make it in Nickel Steel, the bore is 0.9842" dia, limit + .0005" (2) We do not measure the bush bore after fitting, the diametral clearance is about .001 - .002" (3) The pin diameter is 0.748", limit - .0005". The brinell hardness of the pin should be 248 - 269. This pin is made in nickel steel not suitable for case hardening; we have increased the Brinell figure to 320 since receiving your letter. Trusting this is the information you require. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||