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).
Agreements and comments on the manufacturing process for Bentley Main Bearings AC7.
Identifier | ExFiles\Box 115\3\ scan0109 | |
Date | 17th November 1937 | |
1020 Files SWDC Hs{Lord Ernest Hives - Chair}/JWW.14/HM.{Capt. W. Hallam - Head Repairs} 17. 11. 37. Bentley Main Bearings AC7. -------------------------- Further to memo' RHC.{R. H. Coverley - Production Engineer}1/MJ. 16. 11. 37., we have given this matter our attention and forward our comments on this communication as follows:- (a) We agree that the AC2 material should be cleared from the Works and forwarded to the Foundry Stores for future consumption as circumstances dictate. (b) We have discussed the matter of composition and control with H1 and have agreed that when material is issued from Stores we will obtain one ingot from each cast number supplied by H.D.A. Also H1 is being forwarded one billet from each batch of castings to be tested for composition and hardness. (c) It has been demonstrated to the satisfaction of H1 that our die temperatures are satisfactorily controlled and the casting temperature being so critical that a variation in either temperature causes a faulty billet to be produced. Die temperature variation does not exceed 50° and metal temperature variation not more than 10°. (d) We agree with the composition and heat treatment specified. (Note:- Tin to read 4.6 to 5.00) (e) We are not in actual agreement with the statement that these castings need another brinell after machining. We also state that if the material fails to respond to heat treatment this material should be ruthlessly scrapped. This should not be qualified or receive further consideration for it is the responsibility of the furnaceman to check and make certain that the furnace conditions are correct and the furnace to be one specifically suited for the heat treatment of these bearings. This component is so important that the chances of qualifying the second treatment of any set of bearings is so critical that when trouble arises the findings and examination of the trouble will be confused. 1. | ||