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).
Suggestion for experimental material changes and treatments for hydraulic damper components, specifically the piston wearing pads and the lever.
| Identifier | ExFiles\Box 95\4\ scan0059 | |
| Date | 14th July 1936 | |
| [Handwritten signature top left] Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} C. BY/HEB.{H. Biraben} [Handwritten] x342 BY.2/G.14.7.36. [Handwritten] LF [Handwritten] Please follow up [Handwritten signature] HYDRAULIC DAMPERS. ------------------ (a). Wearing pads in piston. I would like to suggest that we try out some of the above pieces made in our standard 5% case hardening nickel steel. They should be carburised in the ordinary manner in the carburising furnace, but for the final quench they should be heated up in and quenched from the cyanide bath. The object of this is not to have a casing produced by cyanide hardening, but to ensure a dead hard surface, the depth of the casing should be .035 to .045. The material itself should be SZNX. (b). With regard to (b) Material for the lever, I believe the trouble originally was the diffi culty of swinging the arm for grinding in a machine. This has since been overcome, and there is no reason why we should not make the lever in SZNX, and all other levers of this type should be similarly treated. Will BY/HEB.{H. Biraben} kindly instruct up the above parts (two sets) experimentally. BY.{R.W. Bailey - Chief Engineer} [Handwritten signature] | ||