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 Company discussing the gear ratio and efficiency of the L7 Gear for Marles-Weller steering gears.
| Identifier | ExFiles\Box 28\3\ Scan049 | |
| Date | 14th November 1934 | |
| Telegrams: "ADAMANT, Phone, Luton." CONTRACTORS TO H.M. ADMIRALTY, WAR OFFICE & AIR MINISTRY. Telephone: LUTON 1818 (2 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.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.M.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}/21/KW Our Ref PGM/AGS/GB. Head Offices, Works and Design Dept.: DALLOW ROAD, LUTON. 14th. November, 1934. Messrs. Rolls-Royce Ltd., DERBY. (Handwritten: HDY{William Hardy} HS{Lord Ernest Hives - Chair}/FJH{Fred J. Hardy - Chief Dev. Engineer}) Dear Sirs, For the attention of Mr. Hardy. We have to thank you for your favor of the 13th instant, reference as above, having regard to the L7 Gear which you were good enough to bring down to our Works the other day, and in which we changed the gear ratio. We are also much obliged to you for the curve you have enclosed of the efficiency, and are very pleased to think that, at the moment at any rate, the backward efficiency gives the desired result. We shall be extremely interested to hear further from you when this gear has had a good run on the road, and we would thank you for promising to advise us. As regards the latter part of your letter, the two standard ratios which we fit in this size of steerings are the two you have already had in the gear now under test. The first gear ratio was such that 2 3/4 turns of the wheel produce 65° movement of the drop arm, and the gear ratio at present fitted is such that 3 1/2 turns of the wheel give the same shaft movement. As stated these are the two standard gear ratios fitted, but there is no reason why we should not fit other ratios, except that, of course, the machine would have to be specially set-up to do this, and for your information we would - 1 - | ||