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 Wellworthy Piston Rings Ltd. regarding queries on AC.9 bearings for Bentley engines.
| Identifier | ExFiles\Box 115\4\ scan0051 | |
| Date | 7th March 1940 | |
| 1020a WORKS TELEPHONE LYMINGTON 520 WORKS TELEGRAMS "WELLWORTHY" PRIVATE TELEPHONE LYMINGTON 232 MANAGING DIRECTOR'S OFFICE WELLWORTHY PISTON RINGS LTD., LYMINGTON HANTS FB/CJR. Ext.26. 4612. Your Ref. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}16/ML. 7th March, 1940. W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce, Ltd., Derby. Dear Mr. Robotham, Many thanks for your letter of the 29th February giving the dimensions of the crankshaft pin and conn. rod housing as requested in connection with the AC.9 bearings for Bentley engines. It is noted you would like flangeless bearings, the width of which is to be 1.130/1.140, but that you also state one half is required plain, that is no dowel hole. As there are no flanges and no dowel on the one half, how do you propose to prevent this bearing trying to work endwise in the conn. rod housing other than by relying on the slight recess which forms the conn. rod bolt clearance? As this is only .0085" deep it will not form much of a location, and there might even be a danger of the bearing trying to ride on the bolts if the bearing moves endwise, and so give a hard bearing adjacent to the conn. rod bolt clearance. One other point, are the ends of the AC.9 bearings to be left absolutely square, or do you require a .005" or .010" chamfer so as to prevent high loading at the ends where the bearing is likely to come into contact with the radii at each end of the crankpin. Apart from these queries, production is going forward immediately, and we expect to have a dozen such bearings ready for delivery to you in about five weeks from today's date. Yours sincerely, | ||