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).
Investigating whether the material used for Bentley chassis big end bearings was forged or extruded bar.
| Identifier | ExFiles\Box 115\1\ scan0219 | |
| Date | 14th January 1936 | |
| R.Lee Rm.{William Robotham - Chief Engineer} C. E.{Mr Elliott - Chief Engineer} C. Hs.{Lord Ernest Hives - Chair} Sewell. 1020 Please investigate and let me know. R.M. BY/EM.32/MM.14.1.36. BENTLEY CHASSIS. Big End Bearing Material. There is one point which is seriously in doubt still in regard to the above, namely whether the bearings tried out were made from forged or extruded bar. Forged bar has been the term used, but we cannot find that any forged bar has been delivered recently, but on the other hand we know that extruded bar has been available. We are pursuing this matter with Hl., but would like to know whether the Experimental Dept., have any of the actual bar left from which the bearings were made, or whether they can give us any particulars as to where it was obtained so that we could settle whether it was forged or extruded. It is of course of the utmost importance we should use similar material to that used experimentally. The bar which has been delivered for production purposes is described as forged by our suppliers, but we have definitely ascertained that it is really extruded bar which has been supplied. BY.{R.W. Bailey - Chief Engineer} EM for By THE MATERIAL USED FOR THE EXPERIMENTAL BEARINGS WAS EXTRUDED BAR SUPPLIED BY MESSRS. REYNOLDS. THESE BEARINGS RECEIVED A STRESS RELEASE TREATMENT BEFORE GRINDING OPERATION OF 160°-170°C FOR 6 HOURS. F.T. Hall | ||