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).
The feasibility of incorporating steel pads into gearbox forks during the casting process.
| Identifier | ExFiles\Box 136\2\ scan0061 | |
| Date | 10th March 1939 | |
| 1153 Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} RHC{R. H. Coverley - Production Engineer}/JWW.3/HM.{Capt. W. Hallam - Head Repairs}10.3.39. Gearbox Forks. ------------- We have considered the incorporation of steel pads in the Gearbox Fork which you have loaned to us, and are afraid that this is not a very desirable proposition. It will be quite easy to incorporate the steel pads in the casting, but as these pads will reach a temperature of some 950°C, it is doubtful whether they will retain their hardness. The alternative of hardening after casting may tend to loosen the insert from the aluminium bronze casting, and as the Selector is a piece which is subject to high duty, we consider that such a procedure is rather risky. If you can devise a steel which will not soften at 950°, or will at least maintain a suitable hardness after being brought to this temperature, then you can safely accept a "cast in" insert. Selector Fork is returned herewith. | ||