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).
List of engineering notes and required modifications for various mechanical components.
| Identifier | ExFiles\Box 6\4\ 04-page016 | |
| Date | 12th March 1924 guessed | |
| contd :- -2- (4) PEDULUM LEVER. We note the horns for operating interlock are of different heights. We cannot sanction this even to facilitate machining, and consider that they should be improved by an addition to their height of .025 beyond that shewn on Lec.1897. (5) CHANGE SPEED SHAFT BUSHES. We consider that steel in place of bronze would be better for the bush on inner end of shaft shewn on Lec.1914 This applies to both the bushes upon which the centering spring bears. (6) WASHER BEHIND HYATT SPIGOT BEARING. This to be of steel. (7) SPLIT BUSHES IN THIRD MOTION SHAFT MIDDLE BALL BEARING. These to be of steel. (8) INTERLOCK ACTUATING LEVERS. TOP & BOTTOM. We noticed that with the models sent the travel of these levers was not symmetrical about a line parallel with axis of box. We realise that in this instance it could possibly be easily corrected by shortening the change speed lever shaft, but the point we wish to emphasise is that this lever to actuate satisfactorily must move equally on either side of the line referred to. (9) SERVO DRIVE. The oil retaining portion of the bore for the bearing on the near side we note was machined off. On Lec.1937 we shewed a cover for this and speedometer drive, using existing machining on box. (10) SPEEDMETER DRIVE CASING COVER. At present the 4 studs holding on the large cover of this drive are symmetrically arranged. In order to prevent the cover from being put on in any other position than that in which the oil duct to the bearing is uppermost, we would ask you to close in the 2 lower studs towards one another symmetrically about the vertical centre line by an amount of .075 measured on the circumference of the pitch circle. (11) REVERSE PINION SLEEVE. This piece we wish to improve by a slight chambering of the bore as shewn on Lec.1954 herewith. contd :- | ||