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).
Specifications and procedures for Bentley Main Bearings material.
| Identifier | ExFiles\Box 115\3\ scan0099 | |
| Date | 16th November 1937 | |
| To Hs.{Lord Ernest Hives - Chair}, BY.{R.W. Bailey - Chief Engineer}, Rm.{William Robotham - Chief Engineer} c.c. Hl., HPS.{Horace Percy Smith - Experimental Factory Mgr}, JWW. SWDL{Len H. Swindell} Noller RHC.{R. H. Coverley - Production Engineer}1/MJ.16.11.37. 1020 BENTLEY MAIN BEARINGS. We have had a discussion with Hl. on the procedure to be adopted regarding replacement of AC.2 Bearing Material by AC.7 and it was agreed that - (a) All existing Material should be cleared from the Works and sent down to the Foundry. (b) Hl., along with Mr. Wheeler, is to go into the question of Material Composition and the Control of same. (c) Die temperatures are to be more effectively controlled. External Die 450°C. Internal Die with Internal Pin 200°C. (d) Material Composition to be kept within the following - 4.6 to 5 Tin. .4 to .8 Antimony. .35 to .5 Magnesium. .45 to .65 Silicon. 1.6 to 2% Nickel. .7 to .9 Manganese. Maximum Iron .45 Treatment - Initial treatment for period of 8 Hrs. from 170 to 180°C. Brinell not under 42. (e) After machining to be treated at 12 Hrs. at 160 to 170°C. Brinell 45. If Material fails to respond to treatment and the Brinell figures ca not be obtained Material to be scrapped. This of course should receive further consideration because there may be some condition arise in the furnace as EY. points out where they have not been treated under correct conditions. (f) Operation drawings to be altered leaving a minimum amount for final sizing so as to eliminate possibility of Brinell being effected. (g) Material to be produced in batches and correctly recorded so that if a failure occurs the records can be referred to regarding Composition, etc. | ||