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).
New drawing (PD.82) for the Bentley and Wraith gearbox layshafts, cancelling drawings PD.67 and PD.68.
| Identifier | ExFiles\Box 112\2\ scan0044 | |
| Date | 1st December 1937 | |
| 1044 also 228 628 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Rm.{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design}/Hdy.{William Hardy}2/G.C.12.37. 828 F.J. Hardy. BENTLEY, BENTLEY SO AND WRAITH GEARBOX. We send herewith a print of PD.82 which shews the layshafts for overdrive and standard ratios. This drawing cancels PD.67 and PD.68, prints of which were sent to you some time ago. We think that the new arrangement will be found to be a considerable improvement as regards the helical teeth, and it appears to us that the Maag machine can probably be used. The straight toothed gear is not as accessible as before, but can be ground with a 3" diameter wheel. We shall be glad to know in due course whether the teeth can be satisfactorily ground, both as regards the helical teeth and as regards the straight teeth. Small adjustments of angle and number of teeth that may be required to improve the grinding operation will probably not inconvenience us, but a decision that the shaft cannot be ground as a one piece unit will be important to us and we should naturally like to know about this as soon as possible. DA{Bernard Day - Chassis Design}/Hdy.{William Hardy} | ||