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).
Specification for a dummy model armature for the 'Goshawk' II dynamo design.
| Identifier | ExFiles\Box 51\1\ Scan024 | |
| Date | 17th August 1921 | |
| X4383 EXPERIMENTAL To BRC. U.S. EFC. RECEIVED AUG 22 BY/WER7/EF17. 8. 21. X. 4383 - "GOSHAWK" II. R.R. DESIGN OF DYNAMO. It is required that a dummy model Armature complete with winding be produced in order to see whether the winding can be wound into the estimated space. D.{John DeLooze - Company Secretary} 50207 Winding Lay-Out. D.{John DeLooze - Company Secretary} 50215 Banding Wire Insulation - 18 off. This part can be cut from F.6547. D.{John DeLooze - Company Secretary} 50216 Slot Lining - 29 off. D.{John DeLooze - Company Secretary} 50217 Slot Separator - 29 off. D.{John DeLooze - Company Secretary} 50218 Dummy Armature. - 1 off. West.Wittering ask for this dummy to be produced in wood presumably mahogany, but for ease of cutting the slots perhaps you would prefer to use an alloy. F.{Mr Friese} 6546 Banding Wire Clip - 12 off. Banding Wire - 3 bands each consisting of 15 turns of No. 25 S.W.G. (.020) Steel Banding Wire - total length required - 36 ft. (This wire is the same as used on the standard S.S. Motor Armature). Winding - Copper Wire No. 19 S.W.G. (.040) double cotton covered - total quantity required - 247 feet. Super Fine Dynamo Tape - .005 thick x .250 wide - total quantity required - 153 ft. When ordering the above wire and tape it would perhaps be desirable to order more than the quantity given above, in order to avoid delay when the time comes for winding actual Armatures. It will be noted that on D.{John DeLooze - Company Secretary} 50207 we give a maximum and minimum dimensions of the overhang of the End Winding. It was first estimated that the winding could be wound up to the dimensions given as the minimum, but, after going into the matter more thoroughly and taking into consideration the variations that are bound to occur on production such as varying thickness of the coils after taping, and the desirability of not having a "tight" winding, it is thought unwise to cramp the overhang into less space than the dimensions given on D.50207 as the maximum. It is the actual proof of this that we require and until this is known we are not issuing those mechanical details of the motor such as Shaft, Frame etc., which would be affected by any change in the overhang of the winding. Contd' | ||