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).
Test procedures for a dynamo, focusing on brush noise, bedding, and performance under various load conditions.
| Identifier | ExFiles\Box 62\3\ scan0124 | |
| Date | 22th January 1931 guessed | |
| -3- Particular notice should be taken of any undue brush noise which may develop on this test. On any brush which is noisy, it should be again checked that the clearances between the brush and its holder both axially and circumferentially, and between the bottom of the holder and the commutator, do not exceed the specified amount. Also that the bedding of the spring on the bevel of the brush and of the brush on the commutator are O.K. Failing to quieten noisy brushes in this way, the armature should be removed and the commutator skimmed, before proceeding with the final running test. (4) Final bedding of brushes. With end cover removed the dynamo shall now be run on load at 1600 r.p.m. for 3½ hours charging at a voltage of between 18.2 and 18.7. This should render the brush bedding finally satisfactory, and allow time for any blackening, which the machine will normally have, to take place. (5) At the termination of the above run, observations shall be made of the output of the machine at this same speed of 1600 r.p.m. which output should lie between 15.5 and 16.5 amperes, the terminal voltage being adjusted to 18.5 ± .1 (6) With the dynamo still in the same hot condition it should be verified that running on open circuit it shews a voltage of at least 13.6 at 750 r.p.m. (7) The dynamo shall again be run on load and its | ||