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).
Alternatives for utilizing obsolete Bentley rear axle bevel pinions to avoid scrapping them.
| Identifier | ExFiles\Box 84\4\ scan0381 | |
| Date | 23th March 1938 | |
| To: By & Rm.{William Robotham - Chief Engineer}...From RHC{R. H. Coverley - Production Engineer}/A.McWilliams S-to-He. [Struck through] RE BENTLEY REAR AXLE BEVEL PINIONS x 202. [Handwritten] We have in production 48 bevel pinions, GB.2351 produced for the 10/41 ratio axle which are machined to a stage immediately prior to gear cutting, and which are due to be scrapped with the introduction of the 10/43 bevel pinion, GB.3439, at the 1st chassis in 'M' series. The major differences which are effected by the change at this stage of production are the diameter of the bevel blanks, and the length of the tail bearing, and it is suggested that one of the following courses be adopted in order to utilise these parts :- (1) The end of the rough turned nose bearing be coppered to avoid carbon penetration, and special care be exercised during turning and re-centering this end, as only .005 - .010 surplus metal exists when converting to part No. GB.3439. This would enable the new pinion to commence at 'M' series without scrap. [Diagram of a pinion with labels: END COPPERED BEFORE CARBURISING] (2) That the pinions be converted to GB.2352, which is a 10/43 pinion incorporating a tail bearing identical with the present standard 10/41 pinion GB.2351. The 48 available blanks have ample metal for this purpose and can be converted without difficulty, whilst the remaining 152 pinions for 'M' series can be machined from the commencement to GB.3439 which incorporates the latest tail. Will you please give consideration to the above alternatives. [Signature] RHC{R. H. Coverley - Production Engineer}/A.McWilliams. P.S. The scrap involved with the 48 pinions in question is £18 but this does not necessarily account for all expenditure in connection with an alteration of this nature because there are so many incidental operations for which a value cannot be assessed, but the dislocation to Production that would result since existing parts can be brought in without effecting the reliability of the pinion, is the main reason for the recommendation that these parts should be used. RHC.{R. H. Coverley - Production Engineer} | ||