Excerpt from How to Build: An One-Half Horse Power Motor or Dynamo
Provided with the castings, the holes for the core should be bored out smoothly to two inches in diameter. For doing this the castings may be either bolted to the traveling carriage of a lathe, and a boring bar inserted, or to a face plate, using a rigid inside boring tool. If possible finish with a reamer. Drill, tap and counter-bore for the seven-sixteenths inch screw "a" on the bolt and screw list, Figure 4. The slots at the bottom, which may well have been cored part way, can now be extended through with a hack saw. The core is to be of wrought iron, seven and three-sixteenths inches long, smoothly turned to two inches in diameter. If what commonly known as "cold rolled" steel is available, no turning will be necessary. This quality of steel is very soft and quite as good as wrought iron for magnetic purposes.
Put one pole piece on the core, tighten the clamping screw; drill a one-fourth inch hole through the cast-iron into the steel and drive in a steel pin about three-fourths inch long. These two parts will then be permanently attached. Slip on the other pole piece, see that the protruding arms are parallel, tighten in place, and drill a one-fourth inch hole in the end, so as to be half in the core and half in the pole piece, in the location as shown, and drive in another pin. This method locates the two parts definitely, but allows easy removal of one pole piece for placing the field spool.
The boring of the ends of the arms and the field may now be done. Bolt the structure as now assembled to the carriage of a screw cutting lathe.
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