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).
Faults and proposed solutions for the 20HP slipper drive.
| Identifier | ExFiles\Box 74\3\ scan0284 | |
| Date | 26th October 1923 | |
| X4221 EP.{G. Eric Platford - Chief Quality Engineer} c. Hs.{Lord Ernest Hives - Chair} BY17-P26.10.23. 20HP. SLIPPER DRIVE FAULTS. Referring to EP{G. Eric Platford - Chief Quality Engineer}18/H221023, the obvious solution to the trouble in question is to turn back the bolt fixing the spring movements a full turn instead of half a turn. It appears to me that the increased pains the Works have gone to in following out your requirements by lapping in, have done away with any possible expansion allowances which would have been available otherwise as a check on the expansion resulting from dampness. We do not understand why you should now say the screw bolt method of adjusting the spring is unreliable, as the proposal was developed in conjunction with yourself and Hs{Lord Ernest Hives - Chair}, and until quite recently shewed no signs of being wanting in definition. I think the reason why you did not seize up previously was as I suggested above, there was room for expansion of the fibre due to the fibre itself not bedding accurately all over. It seems to me that the proposal to make a full turn back instead of a half turn is a satisfactory solution. If, however, Hs{Lord Ernest Hives - Chair}, agrees with you that it is right for us to go back to the shoulder bolt than you will have to accept the other evil and which you originally considered was not reasonable, namely, that you should not control the length of the spring to a close dimension. If this is agreed to then the issue is a clear and simple one, but if you are going to ask us to give you a spring which can only permit of .010" movement, or a dimension in this neighborhood, then such a position cannot be attained except by a screwed adjustment. We are quite willing to carry out anything that you require, providing it is not hedged in by stipulations which make it impossible. BY.{R.W. Bailey - Chief Engineer} | ||