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 discussing the design and materials for two new clutch plates.
| Identifier | ExFiles\Box 26\4\ Scan410 | |
| Date | 2nd October 1929 | |
| x718 F.1941 FERODO LIMITED. WIRES: "FRICTION, PHONE, CHAPEL-EN-LE-FRITH". TELEPHONES: 19, 20 & 21 CHAPEL-EN-LE-FRITH. (3 LINES) CODES:- 5TH EDITION A.B.C. LIEBER'S. MARCONI INTERNATIONAL. WESTERN UNION FIVE LETTER EDS. Depots. LONDON 222, TOTTENHAM COURT ROAD, W.1. BIRMINGHAM 202, CORPORATION STREET. MANCHESTER 32, CATHEDRAL STREET. LIVERPOOL 1-3, BERRY STREET. GLASGOW 65, BOTHWELL STREET. BRISTOL 19, PARK STREET. BELFAST 158, NORTH STREET. LEEDS 25, HUNSLET ROAD. BRIGHTON 84, QUEEN'S ROAD. NEWCASTLE-ON-TYNE WORSWICK ST, PILGRIM ST MESSRS HASLAM & STRETTON LTD CARDIFF, 11, WINDSOR PLACE. NORTH MIDLAND COLLIERIES, W. E.{Mr Elliott - Chief Engineer} CHESWICK, CHESTERFIELD, DUNSTON HALL. MESSRS F.{Mr Friese} W. HARRIS & CO. STOKE ON TRENT MOORLAND ROAD, BURSLEM. MR SIDNEY HILL, COVENTRY, 1, QUEEN'S ROAD. NORTHERN MILL & MINE FURNISHING CO CARLISLE, ANNETWELL STREET. Foreign Factories. FERODO AND ASBESTOS INC. U.S.A. NEW BRUNSWICK, NEW JERSEY. LA{L. A. Archer} SOCIÉTÉ ANONYME FRANÇAISE DU FERODO, 2, RUE DE CHATEAUDUN, PARIS. DIE DEUTSCHE FERODO GESELLSCHAFT, BERLIN, MARIENDORF. (HOPKEN & CO) GROSSBEEREN STRASSE, 128. Regd. Office & Works SOVEREIGN MILLS, CHAPEL-EN-LE-FRITH, VIA STOCKPORT, ENGLAND. 2nd October, 1929. All Communications to be addressed to the Company and not to Individuals. PLEASE ADDRESS YOUR REPLY. DEPT. REF. FJF/LED. YOUR REF. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}6/MJ. Messrs.Rolls Royce Limited, DERBY. - For the attention of Mr.W.A.Robotham - Dear Sirs, In further reference to your letter of the 17th ulto., we have received the two clutch plates and are proceeding with the work of covering them - at your suggestion we are using two different materials with a common binding ingredient. In regard to the inertia of the plates, the plain plate will be a little heavier than the lined one, as a considerable quantity of metal must be removed to form keys for the lining. It is quite possible that the alteration of the position of the linings may affect the action of the clutch, that is if there is any tendency for the plain plate to judder this action may be accentuated, but in any case it may be necessary to set the plates to provide some measure of first engagement spring effect. We may add that the choice of material suitable for the moulding on process is very limited; for instance, Ferodo Bonded Asbestos cannot be used, but Ferobestos lends itself remarkably well to the operation, and we have made a few thousand lined plates for small cars, and generally find in this instance that Ferobestos is quite satisfactory - but as the lining wears a considerable quantity of powder is produced, which may actually prevent the pressure plate coming into full contact if the space round the outside of the plate is limited and the dust allowed to accumulate. We note the annular space round the inside of your clutch casing is on the small side, and may be filled up with dust as the linings wear down. We have marked the plates where they can be slit, should slitting be found necessary to prevent distortion. Under separate cover we are sending you one of each standard size disc linings with cemented joint - as you will see they are practically jointless linings and may interest you from that point of view. | ||