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).
Investigation into excessive brush wear on a dynamo from a specific chassis.
| Identifier | ExFiles\Box 47\4\ Scan140 | |
| Date | 3rd November 1923 | |
| X. 4333 EFC. c.c. EP.{G. Eric Platford - Chief Quality Engineer} BY9-P5.11.23. X4333 CHASSIS 59.S.1. WILLIAMSON. No.197. EP{G. Eric Platford - Chief Quality Engineer}/HSS/0311023. I am sending you herewith the dynamo which I asked EP.{G. Eric Platford - Chief Quality Engineer} to have returned from the above chassis. The complaint originally was excessive brush wear. I consider like the previous one I returned to you for a similar complaint that we should run this dynamo for the equivalent of 2,000 miles and a new set of brushes, checking the wear of the brushes at the finish of the run. If the wear was excessive then I consider we should clean out the mica between the Commutator bars according to our present practice, and again run, so as to check whether the improved undercutting of the mica prevented the wear and tear of the brushes. If it did so then unquestionably we shall have to stand the racket of the new dynamo we have supplied, against an A.T.D. number. This matter is important, because, if from the two samples we have now received, which I think should be sufficient for the purpose, we can prove or disprove that the condition of the Commutator is itself the cause of the wear, then we would be able to make up our minds whether we should instruct depots to take steps to deal with the clearing of the mica efficiently between the Commutator bars by a tool like that used by Mr Coverley, or not. BY.{R.W. Bailey - Chief Engineer} By | ||