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 Ferodo Limited's Chief Chemist discussing the performance of No. 6 type clutch material against various steel plates and cast iron.
| Identifier | ExFiles\Box 141\1\ scan0132 | |
| Date | 30th April 1936 | |
| All Communications to be addressed to the Company LE Smith FERODO LIMITED TELEPHONE: 19 CHAPEL-EN-LE-FRITH (4 LINES) TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH. FERODO REGD. TRADE MARK. BRAKE & CLUTCH LININGS CODES: WESTERN UNION FIVE LETTER EDITION, BENTLEYS COMPLETE & 2ND PHRASE, MARCONI INTERNATIONAL, LIEBER'S CODE, LIEBER'S LATEST CODE, A.B.C. 5TH & 6TH EDITIONS. CHAPEL-EN-LE-FRITH, STOCKPORT, ENGLAND. 30th. April 1936 YOUR REF. OUR REF. JNL/KM Depots:- LONDON 222, TOTTENHAM COURT RD W. 1. ABERDEEN 26, GUILD STREET. BELFAST 8, 10 & 12, MONTGOMERY ST BIRMINGHAM 198, CORPORATION ST BRIGHTON 84, QUEEN'S ROAD. BRISTOL 118, VICTORIA STREET. CARDIFF 39, CHARLES ST DUBLIN 120, UPPER ABBEY ST GLASGOW 70, WATERLOO ST LEEDS 25, HUNSLET RD LIVERPOOL 1-3, BERRY STREET. MANCHESTER 32, CATHEDRAL ST NEWCASTLE-ON-TYNE WORSWICK CHAMBERS. 10, WORSWICK ST OFF PILGRIM ST Messrs. Rolls-Royce Ltd., DERBY. For the attention of Dr. F.{Mr Friese} L. Smith. Dear Sirs, In reply to your letter of April 29th., concerning No. 6 running against medium carbon steel plates, I should like to define my opinion a little more precisely than I did when you were here on Monday. The disadvantage with clutch materials of the No. 6 type (rubber-bonded containing brass wire) is that they do not behave well when rubbing against certain steel centre plates. The tendency is that they will badly groove and, although this does not always happen, it certainly does occur with more frequency with this combination than any other. Cast iron is, in general, quite free from this fault, and certain steels too are immune. I do not think it is sufficient for a satisfactory steel, however, to specify simply .6% carbon. What I did refer to was "high carbon saw steel", such as is produced for clutch centre plates by Tyzacks. In your note, however, I see you refer to "a .6% carbon steel fly-wheel". The mass of metal here is probably such that, if the steel is of good quality and a Brinell about 320, you would have no failures. I still do not feel, however, that you would be as safe with such a steel as you would be with cast iron. Yours very truly, FERODO LIMITED M Longley CHIEF CHEMIST & DIRECTOR. | ||