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).
B.N.D. air hardening gear steel and manufacturing processes for quieter gears.
| Identifier | ExFiles\Box 154a\1\ scan0012 | |
| Date | 28th January 1914 | |
| COPY. X.1474 COPY. To Na.{Mr Nadin} from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} Copy to Wor.{Arthur Wormald - General Works Manager} R5/P 28. 1. 14. The B.N.D. air hardening gear steel, whatever its composition, seems a remarkably strong metal, of a fair degree of toughness, but I suppose it is really too hard to make bevel gears of, as it would not cut accurately in our Bilgram machines. It might, however, bek tested for gear box work. R.{Sir Henry Royce} to see if it would make more consistently quiet gears. However, I understand that this is being met by the process of grinding after hardening by the new machine from Reinecker. | ||