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 from Manganese Bronze & Brass Co. Ltd. regarding the analysis of a worn pin and the production schedule for new Bushes.
| Identifier | ExFiles\Box 85\1\ scan0325 | |
| Date | 19th April 1937 | |
| HEAD OFFICE: CAXTON HOUSE, LONDON S.W.1. 206 GB 2338 SPECIALISTS IN HIGH DUTY NON-FERROUS METALS B.M. 320 THE MANGANESE BRONZE & BRASS CO. LTD., HANDFORD WORKS IPSWICH SUFFOLK TELEPHONE: IPSWICH 2127 TELEGRAMS: BRONZE IPSWICH OUR REF. ER/SV. YOUR REF. Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}15/AP. 19th April,1937. Messrs. Rolls Royce Ltd., DERBY Dear Sirs: We received your letter of the 16th instant and note that you would prefer to try out the denser quality of "Oilite" on an experimental Car before ordering; the production of the eight Bushes to G.B.2332 will take about 14 days. Meanwhile, we have had the opportunity of thoroughly examining the worn component submitted to us, which, upon dismantling, proved to be somewhat dirty and containing a black greasy substance, probably a mixture of oil, mud and metal dust. We were surprised to find the pin to be severely worn, the portion between the two Bushes being appreciably larger than the remainder and from measurements there appears to be at least 0.001 to 0.003 near the flange end and 0.002 to 0.004 at the screwed end. A brinell test of this part gives hardness readings of 228/246 and as we have generally found that similar parts are in a hardened quality material would be obliged to hear if you consider this may be the cause and what quality Steel Pin was used with the Bush that gave satisfaction on the Bentley Car? Examination of the Bushes does not show scoring or severe local wear, but measurements prove them to be distorted as if by hammering; although this is about equal in each Bush, the affects when compared are in opposition to each other. | ||