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).
Outlining proposed experiments and design for a brake drum with an iron liner.
| Identifier | ExFiles\Box 121\1\ scan0356 | |
| Date | 5th November 1940 | |
| - 4 - Cont'd.{John DeLooze - Company Secretary} That's about all I can think of at present. The following are experiments I would like to try, circumstances permitting. Take an iron liner about .130" thick (size before finishing) and cast round it an annular ring of R.R.53.c. .600" thick. Give an "ageing" treatment after casting. Then put it in a furnace, hang a weight on the liner and see at what temperature it falls out. Make several. There might be a few half finished liners about the place. If it falls at round about 200 deg. C. as I think it might, that would be splendid. [Diagram of a liner with weights] Handwritten labels: Liner, WEIGHTS, alum Then I would design a drum as follows :- [Diagram of a cross-section] Dimensions: 1/25", .095" Handwritten labels: alum. thick here General proportions as now. Cast in the liner. Plate it as usual. The ribs are to stop crackling and working out sideways. I do not think the inserted liner is cheap enough for a post-war project. The information we have obtained from inserted liner drums still applies and is very valuable. Incidentally, a good clue to interference fit obtained on the experimental testing could be got as follows :- Measure the internal diam: of liner before casting and after casting. A little calculation, using E.{Mr Elliott - Chief Engineer} for iron and E.{Mr Elliott - Chief Engineer} for alum: should give the interference obtained. I should expect approx: .020" diametral shrink for .026" interference using the dimension given, but I haven't actually calculated it. AFM.{Anthony F. Martindale} | ||