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).
Results of heat treatment tests on frames and pivots, and future design improvements for forgings.
| Identifier | ExFiles\Box 2\B002_X168\ 00000001-page211 | |
| Date | 2nd January 1914 | |
| C O R X. COPY. To Da.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} To Wor.{Arthur Wormald - General Works Manager} from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} Copy to Na.{Mr Nadin} [Handwritten in left margin: Stub Axle] With reference to the front pivots, some little time ago I wrote to know whether these had been subjected to the best heat treatment that could be found for them. This should be from an impact point of view. The test on the frames which I have just received shows that the 800C first heat with the 550C second heat is far preferable to a lower second heat, which I feared would leave the work brittle. Several of these which are not quite up to our future standard should be tested with the 550C second heat. If the stub portion of the axles are thought to be less good than this same part on our old standards they should be scrapped. No further work should be done on any which will not produce first class pieces, but other forgings should be procured. In all work in future, we must strive for a large radius in the corners, and avoid cutting down strength to facilitate grinding. This must be adopted. It means the very maximum strength for a given weight. R.{Sir Henry Royce} | ||