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 manufacturing tolerances and production issues related to cam bores.
| Identifier | ExFiles\Box 153\2\ scan0044 | |
| Date | 3rd June 1936 | |
| X1300 CONTRACTORS TO H.M. ADMIRALTY, WAR OFFICE & AIR MINISTRY. AD FORM 93. Telegrams: "ADAMANT, Phone, Luton." Telephone: LUTON 2662 (3 LINES). [Logo: National Scheme for Disabled Men] ADAMANT ENGINEERING COMPANY, LIMITED (Incorporating J.{Mr Johnson W.M.} C. THREADGOLD & SONS. Established 1878.) Engineers and Founders. [Logo: 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.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}6/KW Head Offices, Works and Design Dept.: Our Ref. FGM/MW/CRJ. DALLOW ROAD, LUTON. 3rd June, 1936. F.J.H. F.J.Hardy,Esq., Messrs.Rolls-Royce Limited. DERBY. Dear Mr.Hardy, I am obliged to you for your letter of 29th May reference as above which has reached us this morning. The information you give in the first paragraph of your letter is duly noted and would seem to dispose of this particular matter. We are assuming however, that the new Roller drawing, copy of which you brought with you to the Works the other day, is still required for production in the future, but we should like to have your confirmation of this. In regard to the size holes through the Cam bores, I have been looking very carefully into this matter in the Works and feel that although you will probably find that Cams in the future will be rather better than the Cams we have sent you, due to extra efforts we are making in the matter, yet I do not think it would be safe to guarantee that one or two here and there may not be outside the limit to the extent of say .0025" as a maximum. As I explained to you at the Works here, we have tried every conceivable commercial method for bettering the size and straightness of these holes, and unfortunately, we are not able to do better than we are doing at the present. One of the troubles is that after heat treatment, the holes vary in size although before heat treatment they are all of one size, and consequently, the finished broaching operation is unable to size them to [Handwritten notes in left margin] 1.1240 1250 1.1244 1.1270 | ||