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).
Specification for the production adjustment of a combined main and auxiliary switch unit, version 2.
| Identifier | ExFiles\Box 64\4\ scan0142 | |
| Date | 19th December 1928 | |
| X7655B EFC/T19.12.28. X.7655E. COMBINED MAIN SWITCH & AUXILIARY SWITCH UNIT. X.7781 SPECIFICATION OF PRODUCTION ADJUSTMENT. VERSION 2. I. ADJUSTMENT. (1) Assuming that the armature stop pieces on the main and auxiliary levers have been duly adjusted to their correct values of .006", the first adjustment of the combined system consists in arranging the relation of the main switch lever side arm to the continental bakelite packing piece on the auxiliary switch lever to give the condition that when both levers arrive at their fully down positions, there is .010" clearance between the main switch lever side arm and the bakelite packing piece. This means that the relay switch lever has a further travel of .010" measured on the core centre line, after the main switch lever is down on its stop. (2) Now insert a .025" non-magnetic distance piece between the armature and core stop of the main switch lever, and with the lever suitable held down.(electrically if desired) to this distance piece, adjust and secure laminated copper contact arm so that every lamination is just in contact with the plain copper contact. This will permit of a maximum compression of the laminated contact of .033", i.e. when armature stop reaches core. (3) Now set the relation of the copper and carbon arms by placing an .020" distance piece between the copper contacts and adjusting the carbons to be just in contact when the laminated copper contacts are just in contact with the distance piece. | ||