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).
Gap table for a main and auxiliary switch unit.
Identifier | ExFiles\Box 64\4\ scan0190 | |
Date | 27th February 1929 | |
MAIN AND AUXILIARY SWITCH UNIT UNIT:_____ GAP TABLES. As instructed by EFC. MAIN SWITCH : Position of switch. Air gap at core centre. Core to armature stop. Copper gap (of last contact to make.) Carbon gap. Off. .080 .084 .075 .040 Carbons just in contact. .059 .059 .040 0 Auxiliary switch carbons just in contact. .037 .033 0 0 Coppers just on contact. .035 .030 0 0 Full on. .010 0 0 0 AUXILIARY SWITCH: Position. Air gap at core. Gap between pole core & arm: stop. Gap at upper contact. Gap at lower contact. Gap at carbon contacts. Off. .065 .065 0 .030 0 Carbons just breaking. Just making on lower contact. .047 .044 .025 0 0 Full on. .010 0 .077 0 .071 EFC. | ||