FIG. 10.—A front view of the Field Frame.
A piece of knitting-needle one and seven-eighths inches long is required for the shaft. Bind the two halves of the armature together in the position shown in Figure 9. Bind them temporarily with a piece of iron wire and solder them together. The wire should be removed after they are soldered.
FIG. 11.—The completed Field Frame, ready for winding.
The Field Magnet is made by first cutting out a strip of tin five-eighths of an inch wide by five inches long and then bending it into the shape shown in Figure 11. The easiest way of doing this with the most accuracy is to cut out a piece of wood as a form, and then bend the tin over the form. The dimensions shown in Figure 10 should be used as a guide when making the form.
FIG. 12.—The Bearings.
Two small holes should be bored in the feet of the field magnet to receive No. 8 wood screws, the purpose of which is to fasten the field to the base.
The Bearings are shown in detail in Figure 12. They are easily made by cutting from sheet tin. Care should be taken to make the bearings accurately so that the armature will be in the proper position when the motor is assembled. Two small washers, serving as collars, should be soldered to the shaft as shown in Figure 13.