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Many amateurs are ambitious to construct a machine of this description but are afraid to attempt it for the reason that, at the first glance, the work appears so difficult and seems to require an extensive equipment of

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FIG. 2.-End View of Machine Before Winding.

machines and tools for its successful accomplishment. The machine can, however, be constructed by anyone having an ordinary foot-power lathe which will swing six inches over the lathe bed. Of course, the better the

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FIG. 4.-Bottom View of Machine Before Winding.

equipment of machines and tools the easier and more accurate the result will be, other things being equal.

The work consists of a large number of operations each one of which the writer will take up in turn and show how the desired result can be obtained.

Figures 1, 2, 3, and 4 are drawings of the complete dynamo as it would appear when the machine work has all been finished and the parts assembled.

The machine is ready to be wound with the necessary wire after which it is to be connected up for use as a dynamo, or motor, as the constructor may elect.

Directions for this part of the work will be found in the chapter on Connecting and Starting.

Let us now take up the details of the machine and begin the actual construction. The field punchings, as before stated, can be procured ready to assemble, but before this work can be accomplished the two sidebearing rods must be completed and we will, therefore, take up these parts first.

SIDE-BEARING RODS

The side-bearing rods form a part of the frame of the machine. A reference to the working drawing, Fig. 5, shows these pieces and gives proper dimensions of all the parts. These rods are turned from pieces of soft steel inch in diameter. It will be seen that a little to

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FIG. 5.-Detail Drawing of Side-Bearing Rod.

one side of the center of their length a narrow collar is left the full diameter of the original piece.

It is first necessary to carefully center-punch the ends of the pieces and drill a small hole in each one for the lathe centers.

Mounting the piece between centers in the lathe, first turn one end of the rod down to the proper size, 3 inch, as far up as the collar, using a tool with a slightly rounded point and considerable "rake." In using a small foot lathe several cuts may be necessary to bring it down to size.

The piece is now removed from the lathe, the dog attached to the end just turned, and the piece again mounted in the lathe for turning the opposite end.

In order to save time and secure accurate results, it is

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