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 to the Dunlop Rubber Company regarding an over-winding issue with a Double-Lift Jack for a Phantom car.
| Identifier | ExFiles\Box 48\1\ Scan033 | |
| Date | 6th September 1927 | |
| C. Mailing Dept. c. Hs. {Lord Ernest Hives - Chair} X4124 BY9/H. 6.9.27. September 6th, 1927. Tuesday. The Dunlop Rubber Company, Ltd. For the attention of Colonel Matthew, Fort Dunlop, Erdington, Birmingham. Dear Sirs, DOUBLE-LIFT JACK. - PHANTOM CAR. In order to settle definitely what the trouble was which Sales had encountered, we found it necessary to dismantle the jack, as no casual examination or test of same conveyed any definite impression to us as to what the real cause of the trouble was. The idea that it was the bevel gears superposed did not seem to us to be the correct one, and in order therefore to settle definitely the cause of the complaint, we dismantled the jack. An examination of the parts shows clearly that the cause of the trouble this time is again over-winding. In this case, the over-winding has resulted in the thread which acts as a stop by being left unmachined, that is, the two flats which are machined across the main length of the small screw do not include the three bottom convolutions. The upper one of these three acts as a stop if the jack is over-wound. The over-winding which took place resulted in bending down the thread so that it was somewhat out of its true position where the load fell on it in over-winding. A further result of this was that before the jack could be screwed down, the nut had to act as a die and clean up the distorted thread. Contd. | ||