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).
Manufacturing limits for the 40/50 side steering tube and proposing a solution for tolerance issues with internal springs.
| Identifier | ExFiles\Box 68\1\ scan0217 | |
| Date | 9th November 1927 | |
| To B.Y. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} X8450 Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG9.11.27. 40/50 SIDE STEERING TUBE. X8450 F8430 We have been going into the question of limits on N.Sch.2301. This scheme is dependent for its success upon a 'set up' of less than .050" on each of the springs. Additionally, there is no means of checking definitely that this set up is being obtained when the springs are inserted in the tube. The only means of making the scheme work is by employing fine longitudinal limits so that when each spring has been set up and inserted in the tube, it will be an overall fit for length. We find that the cumulative limits reach about ± .050" at each end of the tube. It is quite impracticable to make the scheme work with these limits. Will you please arrange for them to be cut down to the absolute minimum consistent with production capabilities. A means of then getting an exact setting would be to provide F.76261 and F.76334 with flanges of various thicknesses to cope with the limits to say ± .003". Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||