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).
Design alterations for a vehicle's steering components.
| Identifier | ExFiles\Box 100\2\ scan0072 | |
| Date | 15th September 1938 | |
| To Da.{Bernard Day - Chassis Design}. from Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions} c. By.{R.W. Bailey - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer}, c. Ev.{Ivan Evernden - coachwork} 450 Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions}6/N.15.9.38, B.III. Steering ------ With regard to Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer}/1/MH.{M. Huckerby}13.9.38, the effect of the 1° increase of caster angle is to drop the ball joint on the end of the cross steering lever approximately 0.200" in relation to the frame. To correct for this, this ball joint should be raised by the corresponding amount, and the lever will then be as that of PD.254 but with the 6.525" dimension changed to 6.325". The lever will otherwise be as the levers of PD.254 and PD.199. No scheme of this alteration will be done unless Da.{Bernard Day - Chassis Design} thinks it necessary, as it should be possible to modify the detail drawing without this. If the 1° caster of Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}10/MH.{M. Huckerby}14.9.38 is adopted the cross steering lever of PD.199 is suitable and should be used. Since the yoke piece dies have been finished, it will not be possible to alter the 1.739" and 1.567" dimensions fixing the lower end of the king pin boss, in view of the close clearance between this part of the boss and the inside of the pivot. The alteration of caster suggested by Rm{William Robotham - Chief Engineer}/FJH{Fred J. Hardy - Chief Dev. Engineer}/1/MH.{M. Huckerby} 13.9.38 is then obtainable by deleting the 1°20' angle and increasing the 3°14' to 3°47'. In order to clean up the upper part of the king pin boss in the existing dies the diameter should be increased to 1.325" and then if the caster of Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}10/MH.{M. Huckerby}14.9.38 is desired it can be obtained by increasing the 3°47' to 4° and inclining the boss in the other view at an angle of 0°30' in the opposite sense to the 1°20' angle previously there. It should be emphasised that for finishing the dies the relevant dimensions for the king pin boss will be 1.739" and 1.567" as now, 1°20' angle deleted and 3°14' increased to 3°47', and 1.200" diameter increased to 1.325". DB.{Donald Bastow - Suspensions} | ||