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 the examination and potential failure of two returned Cams.
| Identifier | ExFiles\Box 153\4\ scan0099 | |
| Date | 11th June 1941 | |
| AD FORM 93 ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS CONTRACTORS TO H.M. ADMIRALTY, WAR OFFICE & AIR MINISTRY Telegrams: "ADAMANT, Phone, Luton." Telephone: LUTON 2662 (3 lines). Handwritten: Steering General File 1300 [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: 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.C.I.S., M.I.P.E., Secretary. ALFRED SLATTER, M.I.E.E. J.{Mr Johnson W.M.} W. HAZEL, F.C.I.S. Your Ref. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}1/RH{R. Hollingworth} Head Offices, Works and Design Dept.: DALLOW ROAD, LUTON Our Ref. FGM/IFW. F.{Mr Friese} J.{Mr Johnson W.M.} Hardy, Esq., Messrs. Rolls-Royce Limited, D E R B Y. 11th June, 1941. Dear Mr. Hardy, I have now had an opportunity of seeing the two Cams you have returned to us and about which you wrote me on the 23rd May, reference as above. I am afraid I have not been able to gather any very valuable data about them from this examination but trust the few remarks I have to make may be of use. Firstly, from our records we find that the heat treatment of these Cams was similar to all the others, no deviation having been made on account of the races not being ground. The depth of case we specify is 1/32" minimum so that it is on the thin side according to your measurement, but I agree with your opinion that it is improbable that this is the cause of the failure. The core at approximately 75 tons per square inch is up to the standard we have always worked to, and in this connection it must be borne in mind that there is a broaching operation on the bore after heat treatment. During the years we have made these Marles Gears we have had a few instances of failure of a similar Contd: - one - | ||