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).
Heat treatment and machining process for Nitro Alloy components and test pieces.
| Identifier | ExFiles\Box 154a\1\ scan0164 | |
| Date | 8th May 1929 | |
| RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} C O P Y. Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/LG18.5.29. NITRO ALLOY. Hall gives us the correct process as : (1) Heat treat material. (2) Machine parts to be nitro alloy within .025 of the finished dimension. (3) Further heat treat. (4) Machine to size and final harden. The bar herewith has the treatment (1). As test bits will you please make : 1.530 .85 +2 1.030 +2 These then could be heat treated - then finish machine to : 1.500 +/- 1/2 .875 +1/2 1.000 +/- 1/2 Final harden and inspect for distortion. We suggest that you also make four pins to F.56376 leaving .025" on the portions to be hardened, hand over to HL. for heat treatment, final machine harden and inspect. Will you please urge these pieces so that we can get an idea whether it is any use trying to get our bits hardened here. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||