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).
Outlining the procedure for unit testing of dynamos to check for noise and general running.
| Identifier | ExFiles\Box 36\4\ scan 018 | |
| Date | 1st May 1920 | |
| Circ. from ED.{J. L. Edwards} c. to HY{Tom Haldenby - Plant Engineer} c. to HY{Tom Haldenby - Plant Engineer} c. to EFC. x.3014/b A.T. EP{G. Eric Platford - Chief Quality Engineer}4/F1.5.20. RECEIVED X.3014/b-HE. UNIT TESTING OF DYNAMOS. I understood it was arranged some time ago that all these dynamos should be checked for noise and general running prior to being passed as suitable for fixing on the chassis. It was agreed at the time that this was necessary in view of the fact that we are having to continually dismantle and refit dynamos owing to their not being satisfactory, the chief failure being that of noise. This it was agreed was a very extravagant job and was causing serious delay with cars on test. A scheme was arranged for this test to be carried out, and it was agreed that a unit test should be made. This scheme is not satisfactory, as we are still having the same trouble. It is essential in making this test that the noise and running of dynamos should be checked, driven under similar conditions as it is on the car, i.e. - 1. Standard driving belt. 2. Actual pulley which will be used with the dynamo. 3. The dynamo supported in a similar way as it is in the frame, with an undershield fixed beneath it. 4. Noise of the dynamo to be checked under variable speed conditions. 5. do. with and without load, i.e. generating current or otherwise. 6. It should be checked that the balance and vibration is satisfactory, and that the dynamo at all conditions of speed is free from periods of noise or periods of balance. The present condition of running the dynamo at a constant speed without load and with the present belt is not satisfactory. It is imperative that such jobs as these should be tackled immediately if we are to reduce the expense and delay caused by cars being builtup with unsatisfactory units. | ||