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RIMS, ARMS AND HUBS OF SPUR GEARS 395
Practically, the width at the arms produced to the hub will
be 5| inches.
h 1
= 0.85 X 5.429 = 4.615 inches.
Practically, the width of the arms at the rim will be
4f inches.
The thickness of the arms is half of their width and the
section is elliptic as shown at A, Figure 9.
The diameter of the hub in cast iron gears is frequently
made twice the diameter of the shaft and the length of the
hub may be from 1| to 2\ times the diameter of the shaft.
Arms in Small Gears.
Small gears with cut teeth are usually calculated according
to the diametral pitch and the size of the arms are largely a
matter of judgment with the designer.
The arms in small gears with cut teeth are generally larger, in
proportion to the size of the teeth, than for gears with cast teeth,
both because when the rim is cast solid it is so much larger, as
the depth of the teeth’ to be cut, and will, therefore, cool off
slower, and if the arms are too small in proportion to the rim, it
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