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).
Outlining an experiment to determine the inaccuracy in crankshaft balancing caused by an initial shaft bow.
| Identifier | ExFiles\Box 85\5\ scan0115 | |
| Date | 24th April 1936 | |
| X47 To RHC.{R. H. Coverley - Production Engineer} Hs{Lord Ernest Hives - Chair}/Std.17/KW.24.4.36. Crankshaft Balance. We wish to determine the inaccuracy introduced into dynamic crankshaft balancing by the initial bow in our crankshafts. Since it is not practicable to straighten a nitro-hardened shaft, we propose to use a soft shaft for this experiment; i.e., balance with the shaft bowed a definite amount, then straighten it and recheck the balance. It has also been decided to run a soft shaft in conjunction with Hall's metal bearings. We propose to use the same shaft for both tests, and would therefore like you to obtain a standard Bentley crankshaft off production before it has reached the hardening stage and finish machine it in the soft condition. This shaft as finished machined should be perfectly straight, and should then be given an artificial bow of .006" - it will then be ready for our tests. Hs{Lord Ernest Hives - Chair}/C.T.Steadman. | ||