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 supply of brake drums, crank shaft dampers, and the manufacturing tolerances of bushes.
| Identifier | ExFiles\Box 141\2\ scan0301 | |
| Date | 15th June 1939 | |
| 1180 All Communications to be addressed to the Company FERODO LIMITED TELEPHONE: 250 CHAPEL-EN-LE-FRITH TELEGRAMS: FRICTION, PHONE, CHAPEL-EN-LE-FRITH. CODES: WESTERN UNION FIVE LETTER EDITION, BENTLEYS COMPLETE & 2ND PHRASE, MARCONI INTERNATIONAL, LIEBERS CODE, LIEBERS LATEST CODE, A.B.C. 5TH & 6TH EDITIONS. [LOGO: FERODO BRAKE & CLUTCH LININGS REGD. TRADE MARK] 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 24, ELDON PLACE, BARRAS BRIDGE. 15th June, 1939. YOUR REF. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}9/MH.{M. Huckerby} OUR REF. WES/PW. Messrs. Rolls-Royce Ltd., Experimental Department, Derby. For the attention of A.F. Martindale Esq. Dear Sirs, We thank you for your letter of the 14th instant, and note your instructions with regard to your axle and brake drums. The latter will certainly be useful for test purposes, particularly as reference drums when testing different types of brake lining. With reference to the crank shaft damper details, we propose supplying these in Ferodo VM.20 material which has a moderate coefficient of friction, and according to our measurements the least possible difference between static and slipping µ. With regard to prints No. EXS.1763 and 1773, we imagine these are bushes for the damper fly-wheel and there is no difficulty in manufacturing these in Ferobestos except that with our available equipment we shall have difficulty in holding the diameter and bore to the stated limit of plus .000" minus .001" and minus .000" and plus .001" respectively. The writer is raising this question with our Works and we wonder if we find it impossible to work to these limits whether the final machining of the bushes could be carried out by your goodselves. Finally, there is no difficulty in treating either of these items by dipping in wax, and we are entering our order to correspond with your instructions. Should we be unable, however, to machine the bushes to your limits and you agree to do the final machining, the waxed bushes should, of course, be dipped after the final machining operation. However, we will write you again with regard to this question of limits. Yours faithfully, FERODO LIMITED. W.E.Shilton Manager, Technical Department. | ||