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 concerning the dimensions of fan belt EB.4202.
| Identifier | ExFiles\Box 135\1\ scan0277 | |
| Date | 30th December 1938 | |
| File Ans genl. 11/35 All Communications to be addressed to the Company FERODO LIMITED TELEPHONE: 250 CHAPEL-EN-LE-FRITH (6 LINES) TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH. FERODO REG D 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. Depots- LONDON 222, TOTTENHAM COURT RD W.1. ABERDEEN 26, GUILD STREET. BELFAST 8,10 & 12, MONTGOMERY ST BIRMINGHAM 198, CORPORATION ST BRISTOL 118, VICTORIA STREET. CARDIFF 60, CHARLES ST DUBLIN 120, UPPER ABBEY ST GLASGOW 70, WATERLOO ST LEEDS 25, HUNSLET RD LIVERPOOL 1-3, BERRY STREET. MANCHESTER 16, JACKSON'S ROW, DEANSGATE. NEWCASTLE-ON-TYNE 2a, ELDON PLACE, BARRAS BRIDGE. 30th December, 1938 YOUR REF. OUR REF. JNL/KM Messrs. Rolls Royce Ltd., Derby. [Illegible Signature] For the attention of Mr. C. S. Steadman. Dear Sirs, Fan Belt EB.4202. We thank you for your letter of December 21st (received on the 28th), on the subject of the six belts to EB.4202 recently supplied. We regret that you find the belts are not to the drawing, and we have proceeded to check both the mould and the spare belts we have here. The results of this check are as follows:- Mould (V165) | Should be | Actually is Top width | .969" | .966" Bottom width | .585" | .588" Depth of V groove | 1/2" | 1/2" Angle | 42° | 41°24' by calculation | | 42° " angle meter [Diagram of a V-groove cross-section with annotations: < .969" >, < .585" >, 1/2"] You will note that the top width is designed to be .031" greater than your required final top width of 15/16" and that it is actually .029" wider. A similar allowance is made on the bottom width, the angle thus being maintained constant at 42°. This width allowance is an empirical one and is intended to provide for the shrinkage of the product after removal from the mould. Hitherto, in every case our calculated allowances have proved sufficient. - continued - To be answered | ||