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).
Alternative method of construction for a Goshawk 11 Dynamo commutator.
| Identifier | WestWitteringFiles\I\May1922\ Scan50 | |
| Date | 18th May 1922 | |
| To Ba. from E.{Mr Elliott - Chief Engineer} c. to Cd. Hor. c. to Hy.{Tom Haldenby - Plant Engineer} HS.{Lord Ernest Hives - Chair}✓ c. to Re. E3/M18.5.22. X4333 GOSHAWK 11. DYNAMO. We send herewith drawing No. Lec 1581 shewing an alternative method of construction for the improved commutator. In this design very little bakelite is used and it only acts as a distance piece between the commutator bars and the metal centre. It does not matter if the bakelite does crack. The method of construction is to put the commutator bars, confined in their steel ring, within the moulding die, also the 2 members of the metal centre. These latter however are not assembled but one piece is fixed to the stationary part of the moulding die, and the other piece, probably the ring marked "A" is carried by the plunger of the die. Owing to the bakelite powder occupying a large volume the 2 pieces of the metal centre are separated by some distance in the initial stages of the moulding. *As the curing of the bakelite proceeds and the die closes up, the ring "A" carried by the plunger should be pressed on to the other portion of the commutator centre with great force.* It is necessary to apply enough pressure on the die to push on the ring "A" so that it will be expanded by the taper, and also to apply the necessary moulding pressure. When the moulding is taken out of the die the ring "A" will stay in position (since it will resist sliding with at least the same amount of force that it was pushed on) and can be locked on by riveting as shewn. When this latter operation is accomplished the retaining ring may be removed from the commutator bars. E.{Mr Elliott - Chief Engineer} | ||