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).
The failure and subsequent design changes of a change speed lever shaft on the 7-EX car.
| Identifier | WestWitteringFiles\Q\February1927-March1927\ 18 | |
| Date | 2nd February 1927 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to B.Y. Mor. ✓ c. to E.{Mr Elliott - Chief Engineer} EY. ✓ c. to DA.{Bernard Day - Chassis Design} ORIGINAL HS{Lord Ernest Hives - Chair}3/LG7. 2. 27. CHANGE SPEED LEVER ON 7-EX CAR. X8320 The change speed lever shaft which failed on 7-EX was instructed on the LeC. to be a solid piece made from tube with each end swaged down. This is the scheme which is instructed for the standard parts being produced. When producing the first experimental parts, we could not obtain the tube swaged at each end for our small quantities and the Expl: Dept: asked the D.O. for an alternative scheme. We received a scheme for the loose end which was to be pegged and brazed. Several sets were made like that and ran satisfactorily. Later the material was changed and the shaft was made in CHNS, and hardened - the brazing was then left off because of it affecting the hardness of the shaft. This was an error - with the change in material, we ought to have pointed out the trouble with the brazing. It was a mistake for which the Expl: Dept: are responsible. Hs.{Lord Ernest Hives - Chair} | ||