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).
Suggestions for 20/25 dynamo improvements to cheapen production.
| Identifier | ExFiles\Box 62\3\ scan0169 | |
| Date | 31th January 1931 | |
| X6065 To E.{Mr Elliott - Chief Engineer} from EFC. c. Ey. c. Wor.{Arthur Wormald - General Works Manager} EFC6/AD31.1.31. X.5661 X.6065. SUGGESTIONS FOR 20/25 DYNAMO IMPROVEMENTS WITH A VIEW TO CHEAPENING PRODUCTION. My assistant Mr. F.J. Allen who deals with the testing of 20/25 dynamos has offered the following suggestions for cheapening the production of 20/25 dynamos :- "(1) Make the carcase equal or little more than the poles and armature iron in length, the remainder to be made up by cylindrical extensions to the aluminium end plates. This will only slightly increase magnetic reluctance which in any case may be no disadvantage, while tax weight and probably tax cost will be saved. (2) Make the carcase from sheet steel bent to cylindrical shape and welded. This is done on Remy machines and has been adopted by Lucas. (3) Convey cables through a hole in the proposed commutator end plate to terminals directly mounted on main brush holders. The terminals to be of the type which pinch the cable ends flat without requiring eyelet fittings to cables. An insulated field terminal could doubtless be accommodated inside the cover. The best scheme is like the Bosch motor but involves non-circular end plate and cover. The above shoubd save machining, bakelite moulding, eyelet soldering, avoid exposed terminals and make end plate removable with fewer wires to disconnect. (4) Brush spring mounting. Replace present expensive carrier spindle by plain spindle having slots for spring and screwdriver as now. Head to be located in a sleeve and a hole through both for split pin. If desired, two holes in the pin at right angles and two in the sleeve at 45° may be used allowing spindle adjustment in steps of 45° De | ||