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).
Opinion on the adjusting washers and disassembly procedures for the Wraith steering column and box.
| Identifier | ExFiles\Box 9\7\ 07-page064 | |
| Date | 29th June 1937 | |
| To E/Ev.{Ivan Evernden - coachwork} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. Hs.{Lord Ernest Hives - Chair} c. E.{Mr Elliott - Chief Engineer} c. By.{R.W. Bailey - Chief Engineer} c. RHC.{R. H. Coverley - Production Engineer} c. RHC{R. H. Coverley - Production Engineer}/Cy. WRAITH STEERING COLUMN AND BOX With reference to RHC{R. H. Coverley - Production Engineer}/Cy.3/LS.3.6.37 our opinion concerning the points raised are as follows:- Adjusting washers for cam. The adjusting washers for a steering cam have to be selected for two distinct adjustments - (a) obtaining the correct endwise position and (b) obtaining the correct preload. The former adjustment is a comparatively coarse one involving graduations of approximately 0.005" and is made first, while the latter is a fine adjustment of the order of 0.0015". There is no reason why, in the Wraith box, the lower washer should not be selected for endwise position only while the final pre-loading adjustment is made on the upper washer. In this case there is no need to use thin washers at the lower end as it is quite practical to have a range of solid washers varying by .005". Dissembly of Box for adjusting cam. It was our intention that for the purpose of adjusting the cam endwise, a special end cover should be bolted to the box in place of the cover Fw.144 with a special rockershaft assembly having a long plain bearing locating in the special cover. With this arrangement it will be possible to remove the rockershaft without dismantling anything and both cam adjusting washers can be changed by removing the one existing cover Fw.142. This method will be even simpler than having an additional end cover as in the latter case two covers would have to be removed for each adjust-ment. A method similar in principle has been used on experimental gears with satisfactory results. We therefore do not consider that design modifications are necessary. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||