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 a supplier discussing the suitability and safety factor of a 'Couploflex' Generator Coupling, addressing torque and torsional vibration concerns.
| Identifier | ExFiles\Box 8\5\ 05-page60 | |
| Date | 9th December 1938 | |
| 617. THE MANGANESE BRONZE & BRASS COMPANY LIMITED IN ASSOCIATION WITH EMPIRE RUBBER CO. (PROPRIETORS: H.{Arthur M. Hanbury - Head Complaints} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} MILES LTD) "DYNAFLEX" SPECIALISTS IN DESIGNS AND MANUFACTURE OF RUBBER BONDED TO METAL, ANTI-VIBRATION MOUNTINGS, COUPLINGS ETC TELEPHONE: DUNSTABLE 533 TELEGRAMS: DYNAFLEX DUNSTABLE WATLING STREET DUNSTABLE BEDS OUR REF HH/W/R.6 YOUR REF RM{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}8/M.H. 9th December, 1938 Messrs. Rolls-Royce Ltd., Derby. Dear Sirs, "Couploflex" Generator Coupling We have your letter of the 5th instant, and thank you for the information you give. Assuming 3 - 4° at 5 lbs feet, the section shown in your drawing EX.S1145 will be quite satisfactory, and will give a factor of safety of about 14. We presume that your reference to 10 lbs feet torque, is only intended as an illustration of your point, and that there is no intention of using such a value, since you previously informed us that the maximum torque is approximately 5 lbs feet. We notice you refer to torsional vibration and as this is the first time this question has been raised, we should like to know the exact position, including the proximity of the running speed of the couplings together with details of any such critical through which the coupling may have to pass. If you have satisfied yourselves on this point, we should be glad to have your confirmation, but if you wish us to investigate it on your behalf, we shall require all the essential data. Yours faithfully, THE MANGANESE BRONZE & BRASS CO. LTD., [Signature: HNewman] "DYNAFLEX" | ||