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).
Chassis frame thickness rationalisation and the manufacturing implications of using common dies.
| Identifier | ExFiles\Box 113\5\ scan0098 | |
| Date | 2nd November 1939 | |
| 1010 + 1022 To Rm.{William Robotham - Chief Engineer} from Ev.{Ivan Evernden - coachwork} c. to Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c. to Les.{Ivan A. Leslie} c. to Ev.{Ivan Evernden - coachwork} Ev.{Ivan Evernden - coachwork}1/JH.2.11.39. re Chassis Frames - Senior Rationalised Programme. The B.V. frame thickness is .104" and dies have been sunk, For Ripplet we have called for a thickness of .080" and for Rippletto .064". We would like to know how the makers would produce all of these frames using the same dies for sections that are common in form. Details for Ripplet, produced by F.{Mr Friese} Dept. shewing .080 thickness are made to keep the external dimensions of the side member constant and details of the pan, gusset and frame cross were treated accordingly we assume. Actually none of these pieces will fit but since the slack is only twice the change in thickness and in their case therefore .048" the trouble may not be serious. In our case the difference is .080". We believe that the makers can only go one gauge less in existing dies, and we would like to write to them to discover whether it is the more economical to keep the inner or outer dimensions of the side channel of constant size. In each case a new half of a set of dies being required for a frame of more than one gauge less in thickness. Can we write to Messrs. John Thompson bearing in mind the industrial conditions? Ev.{Ivan Evernden - coachwork} | ||