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).
With recommendations on the use of Bakelite moulded commutators, citing economy and potential shrinkage issues.
| Identifier | ExFiles\Box 39\3\ Scan191 | |
| Date | 12th August 1922 | |
| V3513 To EFC. from R.{Sir Henry Royce} s R6/M12.8.22. X3513. BAKELITE MOULDED COMMUTATORS X.4333. As the method of making commutators by the Bakelite process should be very much more economical than the usual mica system, I recommend :- (1) That we take steps to find out whether these are made successfully in America. (2) That we continue to use them in the starter motors, in which they have been so far as I know uniformly successful. (3) That we get some of the same powders for these mouldings as is used for the same purpose in America. Finally we ought to remember that as far as my experience goes, the Bakelite mouldings are scarcely satisfactory on other parts of the equipment owing to the shrinkage that takes place, the distributor moulding becoming tight on its aluminium support. R.{Sir Henry Royce} | ||