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).
Clutch finger adjustment on the Phantom III, discussing issues with driven plate parallelism and recommending a new gauging practice.
| Identifier | ExFiles\Box 93\3\ scan0167 | |
| Date | 12th September 1936 | |
| To Hy.{Tom Haldenby - Plant Engineer} C. to Mx.{John H Maddocks - Chief Proving Officer} X 312 Hs{Lord Ernest Hives - Chair}/Smth.6/JH.12.9.36. Phantom III Clutch. It has always been R.R. practice to set the finger adjustment on clutches so that all the fingers come into contact with the trunnion thrust face simultaneously. Logically this should be done with a driven plate of which the faces are perfectly parallel. If the faces are only, say .001" out of parallel and the fingers are set true for one position of the driven plate, they will be .012" out of truth when the plate is turned through 180°. Actually it is not possible on a production basis to grind the faces of friction discs to be within .002" of parallel. We have shown that when the fingers of a Phantom III clutch have been accurately set in the shop in the standard way, they have sometimes been .016" out of adjustment with the driven plate in certain positions. This condition of course encourages jaggering. In view of this we havebeen replacing the driven plate by a gauge plate to Ex. 24066 when we set fingers in the Experimental shop, and we recommend that the same practice is followed in the Works. This gauge is only suitable for the driven plate G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 84810 not for the Borg & Beck plate. Hs{Lord Ernest Hives - Chair}/Smth. | ||