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).
Troubleshooting and testing a new type of starter slipping clutch.
| Identifier | ExFiles\Box 75\5\ scan0061 | |
| Date | 22th July 1920 | |
| R.R. 265A (100 T) (S.G. 848, 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2618 To BY.{R.W. Bailey - Chief Engineer} From Hs.{Lord Ernest Hives - Chair} & F.C. c. to Sft.{Mr Swift} c. to EP.{G. Eric Platford - Chief Quality Engineer} X3350a. Hs{Lord Ernest Hives - Chair}5/LG22.7.20. X3350a NEW TYPE STARTER SLIPPING CLUTCH. Mr. Swift mentioned to me that the works were having trouble with the new type slipping clutch. We obtained from the works a clutch to see if we could see any reason why they should obtain different results to what we obtained. As we received the clutch from the works we could only just get it to slip with jarring it with a load of 600 lbs. On examination we found that - 1. Clearances of G.6494 and G.6492 were incorrect. The scheme shows clearance of .010" which would mean .020" on the diameter. The pieces in question have only .010" dia. 2. Pieces N.4586 and N.4584 had been finally turned before recessing operation for springs and when this operation was carried out the metal was forced out which left no clearance when the clutch was assembled. After we had made this clutch O.K. we obtained the following results:- When first put together the clutch slipped at 480 lbs with jarring. We made several tests with it and the load dropped to 400 lbs. and at that it remained constant. We then took it apart and smeared the fibre washers with oil. The load taken to move it was then 360 lbs. We think it is essential that now we have fitted the bronze bush on these clutches that the clearances of the other parts should be such that they never come in contact. E JUL Hs.{Lord Ernest Hives - Chair}A ATX | ||