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).
Technical assessment of a motor component, detailing build quality, dimensions, and weights.
| Identifier | ExFiles\Box 142\3\ scan0355 | |
| Date | 24th September 1937 | |
| 3. Rm{William Robotham - Chief Engineer}/IMW.{Ivan M. Waller - Head of Chateauroux}6/M.H.24.9.37. Joint is cheap and electrically sound, although the work-manship on this particular job is poor. The tape binding the field coils has not been varnished: we consider the varnishing of these essential. The armature has totally enclosed slots: this has the advantage of a more accurate positioning of slots. With the open type, these often become disturbed during manufacture. Also there is no danger of the conductors being thrown, by centrifugal force, out of their slots; on the other hand, there is the danger of chafing, causing the conductors to earth to the core or to each other, as, with this type of slot the conductors are not so tightly gripped by the core. The condition of the commutator is fairly good. Dimensions and Weights. Carcase diameter 4.735" " length 6.25" " " with end brackets 8.875" Overall carcase length to mounting spigot 7.375" Overall length with drive 14.75" " " of drive 4.625" Brush spring pressure 2lbs. 6ozs. (average) weight of complete motor 19lbs. " " armature 7lbs. 3ozs. " " carcase 8lbs. 9ozs. " " Bracket (Comm.end) 9½ozs. " " " (Back end) 12ozs. " " Drive 1lb. 7ozs. " " Cover 4½ozs. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||