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).
Poor physical test results and machining difficulties with carbon steel crankshafts, suggesting improved normalising.
| Identifier | ExFiles\Box 132\2\ scan0170 | |
| Date | 30th May 1940 | |
| Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} 1116 Cgh{W Clough}/EM.3/P.30.5.40. Crankshafts in Carbon Steel. Whilst probably the present is not an opportune time to discuss the above we find that the physical test results obtained on 3 Chassis cranks in Carbon Steel are not as good as might be expected and the impact results in all three instances are very poor indeed being only 4 and 5 foot lbs. This rather suggests that the heat treatment has not been effective and could be improved by a better normalising. Low impact may mean danger of cracking under reversal of stress. Cgh{W Clough}/EM P.S. This is confirmed by reports of machining difficulties again suggesting better treatment and probably longer and more effective normalising. | ||