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).
Timing errors found in tested camshafts due to incorrect keyway placement and manufacturing angle.
| Identifier | ExFiles\Box 169\4\ img232 | |
| Date | 21th December 1932 | |
| Misc To RHC.{R. H. Coverley - Production Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/WJ.21.12.32. CAMSHAFTS. We have now tested two camshafts to LEC.3223 107°. The timing we should get is shewn in Sketch (1). The timing we actually get is shewn in Sketch (2) The difference between these two shafts is caused by two errors :- (1) The drawing shews the keyway in the wrong place, so that we are always half a tooth out in our timing (2) The angle between the cams has become 106° in manufacture instead of 107°. We presume it is necessary to have some limit on the angle of the cams and would therefore suggest that in future all shafts are made 107° plus 1° as we would rather have the margin on that side. We should also like a shaft made up with a keyway as shewn in the attached print. We should like your opinion as to how accurately the keyway position and the angle between the cams can be held so that we can arrive at the best compromise for instructing production. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||