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).
Instructions for final bedding of brushes and running tests on a dynamo.
| Identifier | ExFiles\Box 168a\3\ img320 | |
| Date | 24th September 1936 guessed | |
| -3- This should continue until the brushes are reasonably well bedded over the whole surface. Particular notice should be taken of any undue brush notice which may develop on this test. On any brush which is noisy, it should be again checked that the clearance between the brush and its holder 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 shimmed, before proceeding with the final running tests. (4) Final bedding of brushes. With end cover removed and field resistance short circuited, the dynamo shall now be run on load for 3 1/2 hours at an output of 20.0 + .5 amperes at 15.0 volts. This should render the brush bedding finally satisfactory and allow time for the machine to test up. (5) Immediately after the termination of the above run, the speed and voltage shall be carefully adjusted until the output of the machine is 20.0 + .2 amperes at 15.0 volts, when the speed should be measured, this should not exceed 1440 R.P.M. | ||