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).
Superior quietness of Brown & Sharpe cut gears over generated gears for the 20HP chassis gearbox.
| Identifier | ExFiles\Box 75\1\ scan0197 | |
| Date | 1st April 1919 | |
| c. Etc. DA.{Bernard Day - Chassis Design} from BY.{R.W. Bailey - Chief Engineer} X4247 BY1/P7/4/19. X.3501 20 HP CHASSIS - GEARBOX SECTION. RE CUTTING GEARS ON FELLOWS MACHINE. I understand that in the Experimental Department they are producing gears for the 20HP Gearbox on Fellows machine. I would like to draw your attention to the fact that so far as quietness is concerned, the Test Department has always insisted that gears cut by the Brown & Sharpe method are considerably quieter than any generated gear. I am bringing this matter to your attention at the moment because it is certainly one that would be raised later on by the Test Department as soon as they know that the gears are being generated, and therefore it would appear advisable at this stage to order special B, & S, cutters to cut the exact number of teeth, (that is, we should not accept a cutter to deal with a range of gears) so that we could have the question of the type of gear settled before the car comes on for production. I cannot explain why the B & S cut gear should be better than the apparently theoretically perfect shaped generated gear, but a large number of experiments carried out in past years consistently demonstrated the B & S cut gear to be quieter. BY.{R.W. Bailey - Chief Engineer} | ||