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4io STRENGTH OF GEAR TEETH
TABLE No. 54 . The value of y. See formula on page 409
Number Involute 20 deg. Involute 15 deg. Radial
of Teeth Obliquity and Cycloidal Flanks
12 0.078 0.067 0.052
13 0.083 0.070 0.053
14 0.088 0.072 0.054
15 0.092 0.075 0.055
16 0.094 0.077 0.056
17 0.096 0.080 0.057
18 0.098 0.083 0.058
19 0.1 00 0.087 0.059
20 0.102 0.090 0.060
21 0.104 0.092 0.061
23 0.106 0.094 0.062
25 0.108 0.097 0.063
27 O.III 0.1 00 0.064
30 0.114 0.102 0.065
34 0.118 0.104 0.066
38 0.122 0.107 0.067
43 0.126 O.IIO 0.068
50 0.130 O.II2 0.069
6o 0.134 O.II4 0.070
75 0.138 0.II6 0.071
100 0.142 0.II8 0.072
150 0.146 0.120 0.073
300 0.150 O.I22 0.074
Rack 0.154 O.I24 0.075
TABLE No. 55. Giving the working stress s for differ=
ent speeds (cast iron) . See formula on page 409 .
Speed in feet
per minute
100 feet
or less
200 300 600 900 1200 1800 24OO
Value of 5 8000 6000 4800 4OOO 3000 24OO 2 000 1700
For steel take the value of 5 two and one-half times that of
cast iron.
Example.
Calculate the horse power which with safety may be
transmitted by a cast iron gear having 60 teeth, of 2 inches
circular pitch, and 5 inches face, at the speed of 600 feet per
minute. The form of trig teeth isthe common 14^ degrees involute.
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