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).
Strongly urging an increase in the thickness of cast iron for aluminium brake drums before production.
| Identifier | ExFiles\Box 85\1\ scan0282 | |
| Date | 16th November 1936 | |
| Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} c. Hs.{Lord Ernest Hives - Chair} 206 BY.7/G.16.11.36. ALUMINIUM BRAKE DRUMS. In view of all the facts, and after thoroughly considering Rm{William Robotham - Chief Engineer}/AFM{Anthony F. Martindale}'s two memos on the subject, I still consider .100" for the thickness of the cast iron to be too little, we should in my opinion have .130". I had not overlooked the fact that the cast iron would stretch elastically, and that therefore the brake shoe pressures increase the original friction loading, but there is, of course, the further factor as towhether ultimately the high co-efficient of friction between the asbestos facing of the shoe and the inside of the liner are likely to be greater than that between the outside of the liner and the aluminium casting which is shrunk on to it. It is difficult to state on the basis of one or two experiments that trouble will not arise, and I would strongly urge increasing the thickness of the drums before the system in question is put on to production. BY.{R.W. Bailey - Chief Engineer} By | ||