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).
Cost reduction exercise for Wraith rocker cover nuts, replacing standard nuts and springs with nickel-deposited nuts and neoprene rubbers.
| Identifier | ExFiles\Box 10\3\ 03-page127 | |
| Date | 20th May 1938 | |
| To By/Ald.{F. Allwood - Experimental Design} From Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} 684 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}2/MH.{M. Huckerby}20.5.38. WRAITH ROCKER COVER NUTS. In order to effect some cost reduction we had made some time ago rocker cover thumb nuts in S/M nickel deposited in place of the standard BZ/S which saves in material cost 8d. per nut or 2/- per unit. These are standing up satisfactorily and we should like to go further as follows:- Nuts E.60743 in S/M nickel deposited with the knurling deleted since a hexagon is included in the nut for spannering. Coupled with the above we wish to replace the springs by Neuprene rubbers in order to effect noise insulation and give a more positive loading on the cover to prevent leaks. The rubbers are to be bobbin shaped to allow for expansion into the nut recess when tightened down. The durometer hardness to be 75, the depth of rubber .437 and the internal bore .500 to spigot on the stem of the nut. When drawings are available we will order from The British Tyre Co. A dish shaped washer in S/M is necessary to give support to the rubber on the circumferential edge of the latter. Will you please detail for the above and instruct for a dozen nuts and washers to be made. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||