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).
Modifications and specifications for the Epicyclic 3rd speed gearbox.
| Identifier | WestWitteringFiles\V\October1930-February1931\ Scan053 | |
| Date | 11th November 1930 | |
| BY.{R.W. Bailey - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} Copy to SG.{Arthur F. Sidgreaves - MD} Copy to HS.{Lord Ernest Hives - Chair} EPICYCLIC 3rd. SPEED GEARBOX ORIGINAL DA{Bernard Day - Chassis Design}1/M1.11.30. X7310. X5310. X523- Herewith we send N. sch. 3160. giving further particulars of the box, namely, the change speed tower, speedometer drive, and the back cover. It will be noticed that there are slight modifications on this scheme as compared with N. sch. 3150., which N. sch. 3160. supersedes as far as these modifications are concerned. We may also mention that as regards the facings for carrying the brake countershaft the one not shewn, namely that carrying the suspension link and servo bridge, should be 5.5 from the centreline instead of the 5.3 indicated on N. scheme 3150. With reference to the middle joint of the gearbox it is necessary to have 2 fitting bolts as dowels. We should like you to arrange the 2 on the horizontal diameter to be say .015 larger in diameter than the remainder, and parallel reamed. DA.{Bernard Day - Chassis Design} RECEIVED 8 NOV 1930 | ||