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 The Hoffmann Manufacturing Co. Ltd. regarding a bearing drawing and proposing a standard part.
| Identifier | ExFiles\Box 94\2\ scan0227 | |
| Date | 5th May 1937 | |
| HOFFMANN Registered Trade Mark BRANCHES: LONDON, BIRMINGHAM, MANCHESTER, LEEDS, GLASGOW. AGENTS IN PRINCIPAL COUNTRIES THROUGHOUT THE WORLD. BALL AND ROLLER BEARINGS STEEL BALLS AND ROLLERS THE HOFFMANN MANUFACTURING Co, LTD. CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AND INDIA OFFICE. MESSRS. ROLLS ROYCE LTD, DERBY. TELEPHONE: 3151 (5 lines) TELEGRAMS: HOFFMANN, CHELMSFORD CODES USED: A.B.C. 5TH EDITION, BENTLEY PHRASE, BENTLEY 2ND PHRASE, MARCONI AND WESTERN UNION 5 LETTER. CHELMSFORD. 5th May, 1937. YOUR REF. RM{William Robotham - Chief Engineer}/GRY{Shadwell Grylls}8/R IN YOUR REPLY PLEASE QUOTE OUR REF. JHW/FC/99222.A Dear Sirs, We thank you for your letter of the 29th April, reference as above, and copy of drawing EX.27423, which have had our close consideration. The nearest standard parts which agree fairly closely with the cage and rollers shown on your drawing would be the cage and rollers of our R.120 bearing, and we are sending a copy of drawing No. 27-3218 giving the dimensions required for this. We very much hope that you will be able to make your parts to suit. The clearance between the ends of the rollers and the guiding shoulders should be kept as small as practicable, without binding. Might we mention that the tracks must of course be correctly hardened and accurately ground. We assume you are satisfied that the bearing will be suitable for dealing with the duty involved, but we will gladly check this over if you will let us know the load and speed involved. We do not propose to supply the parts until we hear from you. Assuring you of our best attention at all times, we remain, Yours faithfully, THE HOFFMANN MANUFACTURING COMPANY LIMITED. ENC. DRG. 27-3218. | ||