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).
Rusting issues and proposed solutions for the Phantom III front brake idler levers.
| Identifier | ExFiles\Box 92\4\ scan0330 | |
| Date | 20th April 1937 | |
| To BY.{R.W. Bailey - Chief Engineer} Copy to Ba. Rm.{William Robotham - Chief Engineer} RMC. HPS.{Horace Percy Smith - Experimental Factory Mgr} RM{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} 306. E/Ev.{Ivan Evernden - coachwork}2/MN.20.4.37. File Phantom III Front Brake Idler Levers on Frame. Certain troubles concerning the Phantom III front brake idler lever on the frame to N.Sch.4569 have been reported to us by the Expl. Dept. in Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}1/M.6.2.37. They consist of the rusting of the lever axis pin in the Oilite bushes, and the rusting of the pins of the forks in the end of the lever. On N.Sch.5121 herewith we show our proposals. To deal with the bearing we propose to use a hardened nickel steel axis pin working in Compo bushes protected by felt washers. The reason for using Compo bushes is that we could not find a suitable standard Oilite bush. The aluminium Bearing housing forging and the steel lever forging are unaltered, but the machining is modified by this change. As an alternative we suggest that the Expl.Dept. might try a hardened nickel steel pin in bronze bushes or soft stainless steel bushes unlubricated, in the existing design. With respect to the rusting of the fork pins, it is suggested by Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale} that we use hardened stainless steel pin with a soft stainless steel bush in the lever, and this we have shown on N.Sch.5121. We ourselves would propose that the bushes be of soft stainless steel and the pins be of hardened nickel steel, and we suggest this to be tried first as it would be the cheaper of the alternatives. Unfortunately the introduction of the bushes in the lever necessitates the increase in the size of the bosses which can be achieved by modifying the die. Ev.{Ivan Evernden - coachwork} Att:N.Sch.5121. | ||