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 Hoffmann Manufacturing regarding proposed design changes to a needle roller bearing for swivel pins.
| Identifier | ExFiles\Box 153\1\ scan0116 | |
| Date | 28th January 1938 | |
| BRANCHES: LONDON, BIRMINGHAM, MANCHESTER, LEEDS, GLASGOW. AGENTS IN PRINCIPAL COUNTRIES THROUGHOUT THE WORLD. HOFFMANN Registered Trade Mark BALL-AND-ROLLER-BEARINGS STEEL-BALLS-AND-ROLLERS THE HOFFMANN MANUFACTURING Co. LTD. CONTRACTORS TO THE ADMIRALTY, WAR OFFICE AND INDIA OFFICE. CHELMSFORD. TELEPHONE: 3151 (Five Lines) TELEGRAMS: HOFFMANN, CHELMSFORD CODES USED: A.B.C. 5TH EDITION, BENTLEY PHRASE, BENTLEY 2ND PHRASE, MARCONI AND WESTERN UNION 5 LETTER. [Handwritten]: 1300 MESSRS. ROLLS ROYCE, LIMITED, DERBY. Jan. 28th 1938. YOUR REF. IN YOUR REPLY PLEASE QUOTE OUR REF. JHW/EH. 103913 Dear Sirs, With reference to Mr. F.J. Hardy's conversation with our Technical Manager Mr. C.H. Smith, on the 26th January, we have now prepared the enclosed Drawing No. 27-3273, showing the needle roller bearing for the swivel pins, which whilst keeping the flanged outer race, we have lengthened the rollers and race by 2 m {Mr Moon / Mr Moore} /m, giving a greater capacity. We have also indicated a lip in the bore of the swivel, which would give increased protection, an annular grease groove being turned in the bore of this lip. A separate Drawing of this bearing is shown on the enclosed Drawing No. 43-579 F, Sec. 56, and from this it will be seen that we have increased the diameter of the flange to 1.537"x with that shown on your Drawing No. GW.1961, to agree, and also increased its thickness. [Handwritten Annotation]: X TO AGREE If the form of mounting shown on our Drawing No. 27-3273 could be ultimately adopted, the internal lip in the swivel could form the abutment for the outer race, and the flange be omitted. Mr. Hardy will recollect that when speaking to Mr. Smith the line was very indistinct, and we were unable to make contact with him yesterday, so that we are not quite sure that we have correctly interpreted your wishes, but if this is not the case, we shall of course be very pleased to make any alteration you desire. Assuring you of our best services at all times, we remain, Yours faithfully, THE HOFFMANN MANUFACTURING CO.LTD. P.S. We confirm having posted four J. {Mr Johnson W.M.} 385 last night. ENCLOSE. Drwg. 43-579 F, Sec.56. 27-3273 | ||