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very small wood screws. The screws should be counter-
sunk. It is very important that none of the screws should
go into the fiber core far enough to touch the shaft.

The commutator may then be split along each of the lines
between the screws with a hacksaw. The saw-cut should
be continued right through the brass and slightly into the
insulating core. The space between the sections of the
commutator should be fitted with well-fitting slips of fiber,
glued in.

The commutator should now be trued up and made per-
fectly smooth.

The commutator is pro-
vided with a small brass ma-
chine screw threaded into
each section near the edge as
shown in Figure 257. These
screws are to receive the ends

, . FIG. 258. — Diagram showing how to
Of the armature Wlndlng and connect the Armature Winding to
so facilitate connections. the Commutator-

The commutator, shaft and armature are assembled as
shown in Figure 258.

The armature may be held to the shaft by a small set
screw or a pin. The commutator should fit on the shaft
very tightly so that it will not slip or twist.

Every part of the armature and shaft touched by the
armature winding must be insulated with paper which has
been soaked in shellac until soft. The armature must be .
left to dry before winding.


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