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).
Continued report on machine testing, lubrication issues, and proposed modifications to a motor.
| Identifier | ExFiles\Box 61b\3\ scan0235 | |
| Date | 26th March 1931 | |
| -2- EFC/AD26.3.31 contd. brush was tight in its housing. The switch terminal was rather loose. On reassembly, the leather wiper with which this machine was fitted, was omitted. The action was found to be very smooth ans the machine passed the production and the engaging tests fairly well except for rather low torque on the teazer and load tests. N.B. The proposed "new engaging" test that is referred to in the first paragraph of the above report is the one which is now included in the attached copy of the new specification of test. My assistant further remarks that our general experience is that sequence motors receive too much lubrication at the commutator end. We think that some reduction in the supply of oil from the central lubricating system might therefore be considered. Further to the above, we have gone into the question of the desirability of increasing the distance over which the motor armature operated switch contact is made during the last portion of the longitudinal engaging motion. We are, as a result, of the opinion that it would be desirable to increase this distance from .200 to .300. Will you please arrange to instruct experimentally a modified lever which can be applied to existing standard motors to produce this/result. In this connection it is interesting to note that whereas we make contact over the last 1/3 only of engagement of pinion to wheel, R.Bosch makes contact over the last nearly 2/3 of such engagement. EFC. Copy of specification attached. | ||