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GEAR TEETH. 389
when a gear has less than twenty-five teeth it is necessary to round
the teeth somewhat outside the pitch circle. By making either a
drawing or a templet, it is very easy to see how much to round
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Fig. 6. Involute Teeth (Cast.)
the teeth to make them clear in the rack. In interchangeable
sets of cut involute gears it is customary to cut the rack with a
cutter shaped for a gear of 135 teeth. This will make the teeth
in the rack slightly curved instead of straight, as shown in Fig. 6,
and this will also make it possible to construct the small gears in
an interchangeable set nearer to a true involute, and still have
them run freely in the rack.
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