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 Adamant Engineering discussing drawings of a Bentley gear cam track and roller to investigate interference causing tight spots.
| Identifier | ExFiles\Box 28\3\ Scan168 | |
| Date | 3rd June 1935 | |
| AD FORM 93. Telegrams: "ADAMANT, Phone, Luton." CONTRACTORS TO H.M. ADMIRALTY, WAR OFFICE & AIR MINISTRY. Telephone: LUTON 1818 (2 Lines). (Logo text: NATIONAL SCHEME FOR DISABLED MEN) ADAMANT ENGINEERING COMPANY, LIMITED (Incorporating J.{Mr Johnson W.M.} C. THREADGOLD & SONS. Established 1878.) Engineers and Founders. (Logo text: THE SOCIETY OF MOTOR MANUFACTURERS & TRADERS LTD) SPECIALISTS in the DESIGN and MANUFACTURE of HIGH PRECISION TOOLS, JIGS, FIXTURES, etc. SPECIAL MACHINES, SPECIAL MACHINE TOOLS and ACCURATE PRODUCTION WORK. SOLE MANUFACTURERS and SALES AGENTS for the MARLES and MARLES-WELLER STEERING GEARS. Directors: S. CARLTON SMITH, A.M.I.Mech.E., M.I.P.E. F.{Mr Friese} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} MATRAVERS, M.A. (CANTAB), A.M.I.Mech.E., A.M.I.E.E., M.I.A.E., M.I.P.E. O.{Mr Oldham} CARLTON SMITH, M.A. (CANTAB), F.I.S.A., M.I.P.E., Secretary. ALFRED SLATTER, M.I.E.E. J.{Mr Johnson W.M.} W. HAZEL, F.I.S.A. Your Ref. Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}18/KH Head Offices, Works and Design Dept.: Our Ref. FGM/AGs/CJ. DALLOW ROAD, LUTON. 3rd. June, 1935. Messrs. Rolls-Royce Ltd., DERBY. Dear Sirs, For the attention of Mr. Hardy. We duly received your letter dated the 30th May, reference as above, together with the sketch you were good enough to send us, in connection with the question of the slightly tight spots on either side of the central position. We were very interested in your letter, and we have gone further into this matter, as undoubtedly in the small gear we have sent to you recently for your Bentley car there were two such tight spots. We are sending you herewith drawings of the actual cam track drawn to scale, and of the roller which was supplied in this Bentley Gear, drawn to 10 times full size, and we think you will find by swinging the drawing of the roller over that of the cam track that definite interference, as we suggested, does take place when the tooth comes over the central position. The centre B on the cam track drawing is the centre from which the cam track is generated, the centre A is the centre round which the roller revolves, and the centre C is any centre which we have taken to demonstrate more clearly this tight spot. Actually when A and A on the two drawings are put in coincidence and the roller is swung round, the interference is not great enough to be very obvious, but when the centres C and C are put - 1 - | ||