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).
Instruction sheet detailing a failure analysis of an electrical component, focusing on brushes, the commutator, and the charging circuit.
| Identifier | ExFiles\Box 57\2\ Scan095 | |
| Date | 29th June 1920 | |
| RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. 2 however, have been badly pitted. (i.e before it was cleaned). The failure is probably due to high output, owing to the control brush position, but this may have been combined with an external imperfection in the charging circuit. 235. The brushes (of EG2 grade) of this machine have been hand scraped and cut considerably, both at the contact faces and the spring seatings. The negative brush spring is somewhat out of line and jams in the brush slot, making the brush movement somewhat sluggish. The commutator micas are undercut, but the solder is thrown out. The control-brush setting is 115° which (cont-d) Signed This Sheet must be filed on completion of the work. | ||