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 discussing test results and potential solutions for issues with Servo Friction Discs, including squeaking problems.
| Identifier | ExFiles\Box 141\3\ scan0345 | |
| Date | 13th December 1934 | |
| 24 HOUR TELEPHONE SERVICE. If number engaged, no reply or after office hours, please telephone your message for us to SLOane 4554 (Private Exchange; day and night service). TELEGRAMS: INDUSTRIAL DEPT. SCANDINAVIA BOROH LONDON AUTO DEPT. AMIANTE BOROH LONDON ASBESTOS DEPT. SCANDILEX LONDON EXPORT DEPT. SCANDILEX LONDON EDD. +3409 Hardy TELEPHONE-HOP 6071 (4 LINES) CODES: PRIVATE, EVERYBODY'S POCKET CODE, A B C 5TH EDITION, WESTERN UNION 5 LETTER, BENTLEYS, ETC. BRITISH BELTING & ASBESTOS LTD. MANUFACTURERS 59 SOUTHWARK STREET LONDON · S·E·I POWER BELTINGS FOR TRANSMISSION AND CONVEYING COTTON · HAIR LEATHER · RUBBER TRADE MARKS SCANDINAVIA SATURN COBBETT SATURNALIA SUMMIT SERVICE B. B. A.{Mr Adams} BRANDS WORKS: CLECKHEATON, YORKS. TELEPHONE: 318 TELEGRAMS: BELTING, CLECKHEATON ALL COMMUNICATIONS TO LONDON AUTO DEPARTMENT HALO · MINTEX AND SCANDURA BRAKE LININGS & CLUTCH DISCS PHOENIX BRAND ASBESTOS PRODUCTS YARNS · CLOTH · TAPE JOINTING · PACKINGS AND INSULATING MATERIALS, ETC. ETC. 13th December.1934. Messrs. Rolls-Royce Ltd., Experimental Department, DERBY. REFERENCE - Hs{Lord Ernest Hives - Chair}/FJH.{Fred J. Hardy - Chief Dev. Engineer}4/KW. Dear Sirs, We duly received your letter of the 10th inst., giving us details of your tests on the Servo Friction Discs recently supplied by us and have now received the followings comments from our Research Engineer. "These results are certainly very interesting, although "Mintex N.M.S" which under our conditions gave the best results,seems to have received the must unfavour-able comments. The wet grinding certainly seems to be a definite advantage. The most persistent trouble appears to be squeaking, and we do not think we can offer any other material at this juncture with a view to obviating this defect. We agree with them that a much more useful purpose would be served by tackling the question of the brake drums, and we certainly think that a alloy cast iron would make for less trouble in this direction. We would also suggest that they make an attempt completely to eliminate the resonant qualities of all the metallic components in the immediate vicinity of the friction faces, and although we have not the details of these various components we suggest that small lead plugs fitted into the surfaces, particularly to any of the unsupported type, would be a very simply means of effecting this. If these measures fail we might then endea-vour to find a material which would give quieter operation than any of the present series they have tried." Yours faithfully, BRITISH BELTING & ASBESTOS LTD R.{Sir Henry Royce} Soull MANAGER AUTO DEPT. RH{R. Hollingworth}/NB. OUR TECHNICAL RESEARCH DEPARTMENT IS ALWAYS AT YOUR SERVICE | ||