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).
From 'R' discussing design modifications for a servo shaft, including an annotated diagram.
| Identifier | WestWitteringFiles\L\Jan1924-March1924\ Scan144 | |
| Date | 19th March 1924 | |
| ORIGINAL SECRET TO RA. FROM R.{Sir Henry Royce} R1/M19.3.24. Copy to H.S. DY.{F R Danby} E.{Mr Elliott - Chief Engineer} A.{Mr Adams} C. X9910 X9770 re. N.sch. 1767. - Your date 11/3/24. SERVO SHAFT. I prefer the lower scheme as a cleaner simpler, and less costly job. I shew modifications to the washer for better oil retaining. I do not think we should require any making up pieces, if so have a selection of tubes. There is really no such thing as a light driving fit: the parts must be OK. or they only slide on or they need a cone fit - (slide these on.) The nut and the shaft should be larger if convenient so as to give larger split pin. It might be thought OK. to tighten the whole column by that nut without fussing over end dimensions to just get a clearance. N. SCHEME 1768. SEEMS O.K. The chief trouble I can see is that of retaining the oil. Mr. Elliott and I have been rather inclined to a washer, thus:- (Ask E.{Mr Elliott - Chief Engineer} if I am right.) [Handwritten annotations on diagram] Possibly need washer here to prevent excess entering. Vent at bottom. Fairly close here to make radial pump. Corner centre of surface. I should just treat the worm wheel as a sliding fit on a parallel serrated 4 or 6 key shaft, a free fit with a ground bore. R.{Sir Henry Royce} | ||