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).
Material change for gears from 3.5% Nickel Steel to a harder 5% C.H.N.S. steel.
| Identifier | ExFiles\Box 73\1\ scan0166 | |
| Date | 9th May 1924 | |
| X9910 Mr. Hives. Sft.{Mr Swift} Hs.{Lord Ernest Hives - Chair} BY32/H.{Arthur M. Hanbury - Head Complaints} 9. 5. 24. ------------------- From the experience that Hs.{Lord Ernest Hives - Chair} has had with the soft gears, that is, 3½% Nickel Steel, with a Brinell Hardness of 321, which are "digging in", it is evident that for the start, at any rate, we must work on hard gears. Will you therefore kindly arrange to alter the material on the drawing from 3½% Nickel Steel to 5% C.H.N.S. Will Sft.{Mr Swift} kindly let us know what his prospects are, now that the material is altered, of getting quiet straight cut spur gears. If this is going to be difficult, we will put in hand some helical cut case hardened gears. BY.{R.W. Bailey - Chief Engineer} | ||