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).
Letter from The Light Production Co. Ltd. discussing the flatness and manufacturing process of scraper rings.
| Identifier | ExFiles\Box 87\2\ scan0195 | |
| Date | 22th June 1936 | |
| x236 MATTHEWS- TELEPHONE: VICTORIA 0671 (5 LINES). CODES: A.{Mr Adams} B. C. 5TH EDITION. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY. ON ADMIRALTY, WAR OFFICE AND AIR MINISTRY LISTS. THE LIGHT PRODUCTION CO. LTD. PROPRIETORS OF THE LONDON PISTON RING CO. LIMITED. TELEGRAMS: INLAND, NAPOLEONIC, SOWEST, LONDON. FOREIGN, NAPOLEONIC, LONDON. CHAIRMAN & MANAGING DIRECTOR: M.V. ROBERTS. DIRECTORS: C.E. GEORGE, WM. THIRTLE. ENGINEERS 60/66, ROCHESTER ROW, WESTMINSTER, S.W.1 WORKS AND GOODS ADDRESS: 61/67, GREENCOAT PLACE, WESTMINSTER, S.W.1. OUR REF. CHB/HD.{Mr Hayward/Mr Huddy} YOUR REF. Hs{Lord Ernest Hives - Chair}/Mths.{Reg Matthews} 23/KW. 22nd June, 1936. Messrs. Rolls Royce Ltd., Experimental Dept., DERBY. Dear Sirs, FOR THE ATTENTION OF MR. W.A. ROBOTHAM. We have now been able to examine the rings referred to in the second paragraph of your letter of the 17th instant, reference as above, and there is no doubt that one or two of the Scraper Rings, as you suggest, do not show from their markings that they are not as flat as they should be. It is interesting to note, however, that they are hammered rings, and when we made rings by this process, the slotting was done after the rings were honed on the sides. With the present day method of manufacture by heat forming, several deliveries of which you have now had, the rings are side finished after slotting, and therefore, any movement created by this latter process is eliminated. This criticism, therefore, does not apply to rings you are using at present. On the other hand, it must be borne in mind that the departure from flatness, which is so readily demonstrable to the eye by marking, is an extremely | ||