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 production of servo worm gear blanks and a supplier's proposed design change.
| Identifier | ExFiles\Box 16\3\ Scan020 | |
| Date | 13th February 1928 | |
| R.{Sir Henry Royce} [crossed out] C. DA.{Bernard Day - Chassis Design} [crossed out] C. E.{Mr Elliott - Chief Engineer} [crossed out] C. HS.{Lord Ernest Hives - Chair} [crossed out] X73707 BY7/G.13.2.28. X7370 EAC.10. SERVO WORM GEAR. ------------------------- With reference to R3/M2/2.28. we are now producing a set of blanks based on the information supplied to us by Messrs. Bostock & Bramley Ltd. for the servo reduction gear in EAC.10 change speed gearbox. These blanks will be sent to Messrs. Bostock & Bramley for cutting as soon as possible. Messrs. Bostock & Bramley propose that the worm wheel should have 19 teeth instead of 18 as specified on the design drawing, and the lead angle made 10° instead of 6°, which they claim will enable them to give us an efficiency in the neighbourhood of 83%. BY.{R.W. Bailey - Chief Engineer} | ||