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 regarding the hardness of tempered hemispheres for steering gears.
| Identifier | ExFiles\Box 28\2\ Scan171 | |
| Date | 27th April 1933 | |
| X4094 Telegrams: "ADAMANT, Phone, Luton." CONTRACTORS TO H.M. ADMIRALTY, WAR OFFICE & AIR MINISTRY. Telephone: LUTON 1818 (2 LINES). ADAMANT ENGINEERING COMPANY, LIMITED (Incorporating J.{Mr Johnson W.M.} C. TREADGOLD & SONS. Established 1878.) Engineers and Founders. 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. Engr. Lt. Commander F.{Mr Friese} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} MATRAVERS, R.N., 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}/Rm.{William Robotham - Chief Engineer}S/KT. Head Offices, Works and Design Dept.: Our Ref: FG/AG/CB. DALLOW ROAD, LUTON. 27th. April, 1933. Messrs. Rolls-Royce Ltd., DERBY. Dear Sirs, For the attention of Mr. Robotham. We are duly in receipt of your favor of the 26th instant, reference as above, for which we thank you, and are glad to note that you are still running one of our Steerings on your car. As regards the tempered hemispheres, we are interested in what you state, but we are wondering whether the tempering of the hemispheres is really at the bottom of this, as the hardness of the tempered hemispheres is almost exactly the same as of the hemispheres which were previously fitted. For your information we would say that the hemispheres are tempered to a reading of 3.2 on our Diamond Hardness Machine, which corresponds approximately to a Brinnell figure of 500, although this equivalent, as you can well understand, is only very approximate. Previous to the tempering operation the average hardness of the hemispheres was in the neighbourhood of 550 Brinell, and in some cases was down as far as 500. You will appreciate therefore that the difference is somewhat small, and we ourselves are of the opinion that the difference in efficiency is probably due to other causes. - 1 - | ||