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).
Hardening process for Nitro Alloy crankshafts and recommending they be hardened all over.
| Identifier | ExFiles\Box 154a\1\ scan0151 | |
| Date | 27th March 1929 | |
| X4469 To BY.{R.W. Bailey - Chief Engineer} } From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} To Wor.{Arthur Wormald - General Works Manager} } c. to Hy.{Tom Haldenby - Plant Engineer} c. to RHC.{R. H. Coverley - Production Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Sft.{Mr Swift} Hs{Lord Ernest Hives - Chair}/Rml/LG27.3.29. NITRO ALLOY. Y7010 With reference to BYG/G21.3.29. which has been handed to us by RHC.{R. H. Coverley - Production Engineer} While E.{Mr Elliott - Chief Engineer} was at the Works recently, we went into the question of whether nitro alloy cranks should be hardened all over. The conclusion reached was that there could technically be absolutely no objection to hardening the webs, as in fact on all our present cranks the webs are less highly stressed than the pins and journals. Additionally, there is no doubt that it would be very difficult to tin the webs only, and this process would add considerably to the expense of producing crankshafts in this material without conferring any benefit on the crank itself. We therefore consider that until tests have shewn it to be undesirable, or Mr. Royce has expressed a definite opinion to the contrary, Nitro Alloy shafts should be hardened externally all over with the exception of course of any screw threads. We saw no shafts with protected webs undergoing treatment at Aubert & Duvals, Paris. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||