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).
Technical memorandum discussing the operation of an actuator box and potential improvements to resolve an operational 'thump'.
| Identifier | ExFiles\Box 64\3\ scan0023 | |
| Date | 7th November 1924 | |
| Contd. -4- EFC3/T7.11.24. As regards the actual operation, apparently the actuator box is only intended to bring the gears just into mesh before the actuator box contact is made, which causes the main current to be switched on. Then, unless the motor is turning vigorously with the teazer current, a thump occurs when the pinion reaches the end of the thread on the motor spindle. The present spiral is one of 45° ^to the axis. It is understood that another spiral of 30° ^to ~~in~~ the axis is instructed, and this will probably make matters better, because the pinion would be screwed home sooner. It is likely also that making the motor turn more vigorously will relieve this thump, but we do not want to make it turn too vigorously because this means a heavy teazer current which has to pass through the top relay switch contacts. Would it not be possible to make the motion of the pinion itself, upon reaching the end of its travel, operate the actuator box contact, so that it would be ^nearly completely in mesh before the full power came on ? The fahlt in the present construction is that the actuator box contact is made too soon. The second point mentioned in Mr. Hives' note is the result of the large gear ratio combined with an arrangement of windings giving insufficient motor acceleration. EFC. | ||