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BEVEL GEARS. 399
Solution
:
Ratio = 80
/i7o = 8
/i7.
For instance, multiplying by 6, the large gear on the shaft
making 80 revolutions will have 17 X 6 = 102 teeth. The small
gear on the shaft making 170 revolutions will have 8 X 6 = 48
teeth.
Assuming that on account of room it is necessary to use
smaller gears, a smaller multiplier may be used, but if it is desir-
able to have larger gears, use a larger multiplier.
Decide on the pitch of the gears according to the work they
are required to do. Make a scale drawing and get the
dimensions as explained on page 397.
Dimensions of Tooth Parts in Bevel Gears.
Fig. 1 2 shows a sectional drawing of a pair of bevel gears of
sixteen diametral pitch, 18 teeth in the small gear and 30 teeth
in the large gear. The pitch diameter of the small gear is || =
lVs inches. The pitch diameter of the large gear is f§ = 1%
inches.
The addendum of -the teeth on the back at a is T^ inch,
the same as for a spur gear of 16 diametral pitch. The thickness
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