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).
The condition of a starter motor, automatic switch, and dynamo after testing.
| Identifier | ExFiles\Box 168a\4\ img103 | |
| Date | 2nd December 1938 | |
| -2- Starter Motor incorporating L.O.P.'s. Rn.{Mr Robinson}650, D.653, D.55020, DB.{Donald Bastow - Suspensions}1768. Motor and drive dismantled and found in good condition, except for the dowler eyelets on the positive brush-holder, which had worked loose. We do not like rivets here and strongly recommend the cheaper brush-gear, but fastened by nuts and bolts as in the Standard Motors. Rm{William Robotham - Chief Engineer}/IN. reported excessive over-run after a false start, this will not happen when the stronger brush springs are fitted. Broached Driven gear incorporated: satisfactory Automatic Switch. Dt.460. This switch is of the simplified type, without carbon contacts to take the arc on breaking. Although this has given no trouble we prefer to wait for the simplified switch to DCD.692 before changing over from standard: the new switch has carbon contacts. Dynamo. (36 slot) LCD.214-250. The dynamo was reported to have failed to charge at the end of 14,000 miles. This was due to the positive brush wearing down beyond control of the pressure arm. Continuing to run under these conditions produced arcing, which badly burned the commutator, and ultimately caused melting of the solder at some of the end connections. After resoldering the end connections and fitting some odd brushes, the machine again functioned, completing 17,600 miles. When examined, the commutator was found to have deep tracks formed in places. There also appeared to be some stiffness in the bearing of the pressure arm. The oiler from the commutator end bearing was also missing, it is reported that these oilers work loose and fall off. Evidence indicates that for various reasons (battery used in Garage for testing wireless set, and therefore frequently in a low state of charge, large amount of night driving, the dynamo output was, for the greater part of the time at a maximum. This, coupled with high speeds which have been maintained throughout the test, constitute conditions of an extreme nature. Under these conditions, | ||