Cost-saving proposal for manufacturing the Rocker Cover Thumb Nut for the Wraith model.
| Identifier | ExFiles\Box 148\5\ scan0354 | |
| Date | 25th June 1938 | |
| To. By & Rm. {William Robotham - Chief Engineer} ....From RHC {R. H. Coverley - Production Engineer} /SB {Mr Bull/Mr Bannister} /GTH. {G. T. Houlistan} Index ROCKER COVER THUMB NUT - WRAITH 1260 The above thumb nuts, E.60743, are at present produced from BZ/S bar at a factory cost of 1.585 shillings each or 4.755 shillings per chassis. It is suggested that in future these be bought out as hot brass pressings, upset from ½" bar and finished in the Works by knurling, boring and tapping, and finally dull nickel deposited. It has been confirmed that this method provides a saving of 2/9d per chassis, and involves a Die and Tool cost of £6. 0. 0d. which will be recovered after producing 44 chassis. The introduction of these can be effected, without scrap, at the 120th Wraith chassis in "B" series. A set of thumb nuts, produced in brass and nickel deposited were tightened down with a spanner 200 times to ascertain whether the plating would withstand service conditions, the results being entirely satisfactory. RHC {R. H. Coverley - Production Engineer} /G.T.Houliston. [Signature RHC {R. H. Coverley - Production Engineer} ] [Diagram Text] HEX LENGTH INCREASED .050 .500 DIA BAR MACHINE ONLY WHERE MARKED THUS " " | ||
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).