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).
Test report on A.C.6.S. bearing material, detailing its composition and performance under load.
| Identifier | ExFiles\Box 115\1\ scan0325 | |
| Date | 23th April 1937 guessed | |
| Bearing Material A.C.6.S. Brinell No.76.3 Composition. Silicon ...... 1.1% Tin .......... 5.0% Antimony ..... 0.5% Nickel ....... 1.5% Manganese .... 0.75% Magnesium .... 1.0% Remainder pure Aluminium. --- Clearance (cold) when fitted .005". Clearance (hot) last check prior to 1st failure .0075". --- V.C.M. sleeve Brinell No.724. --- This bearing completed its run at 2100 lb/sq.in. but on setting up to 2500 lb/sq.in. a sudden rise in temperature of 70°C. was noticed, it was therefore removed and found to have picked up slightly on the sleeve; the rough spots on the sleeve were gently stoned off, the sleeve then being re-fitted. The bearing was replaced untouched except for two V shaped grooves which were cut at the joins of the bearings, these were 1/16" deep and 1/16" wide stretching approximately 1/2" either side of the centre-line of the bearing the object of the grooves being to give a wider oil film to the bearing and at the same time, this bearing metal being suspected of having a tendency to powder, helping to keep the bearing surface washed clean. Further running was then carried out resulting in the ultimate failure of the bearing at the conclusion of 4 hours at 2700 lbs/sq.in. | ||