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).
Measurements and tolerances for P.3 gearbox 1st motion shaft bearings.
| Identifier | ExFiles\Box 94\2\ scan0132 | |
| Date | 21th December 1936 | |
| 328 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} c. to RHC.{R. H. Coverley - Production Engineer} Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls}2/AP.21.12.36. P.3. GEARBOX 1st. Motion shaft bearings. From the data supplied by the D.O. and certain measurements we have taken, we have arrived at the following figures:- Front Bearing 1.35 thousandths possible interference. Rear Bearing. .75 " " Both these figures are more than the initial half thou. diametrical clearance in the race. With regard to the front bearing; in addition to the tightness due to the bearing fit dimensions of .85 thou. there is the fact that the steel housing for this bearing is 3/10. tight in the gearbox and the gear expands 2/10. when forced on the 1st. motion shaft. From observation in the Gearbox Erecting Shop, these bearings are always tight. We cannot blame the manufacture until the tolerances are correct. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} | ||