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).
Relative cost of ribbed brake drums made from cast iron versus high carbon steel.
| Identifier | ExFiles\Box 120\1\ scan0054 | |
| Date | 8th November 1931 | |
| RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/ADM8.11.31. COST OF RIBBED BRAKE DRUMS. As you know, we have recently been testing ribbed brake drums in cast iron and high carbon steel. Our tests have so far shown that cast iron is quite as good as steel. However, we do not think that R.{Sir Henry Royce} will agree to the use of cast iron unless we can show him that it is cheaper than the steel. We should be glad to have your opinion re the relative cost of these two drums taking into account the difficulties of machining the high carbon steel, heat treatment etc. as well as the raw material. The cast iron which we have selected is that supplied by Messrs. Lake & Elliott. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||