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376 GEAR TEETH.
TABLE No. 47 Giving Pitch Diameter of Gears of One
Inch Circular Pitch.
Teeth. Dia. Teeth. . Dia. Teeth. Dia. Teeth. Dia.
12 3.82 !
36 11.46 60 19.10 84 26.74
13 4.14 37 11.78 61 19.42 85 27.06
14 4.46 38 12.10 62 19.74 86 27.38
15 4.78 39 12.42 63 20.06 87 27.70
16 5.09 40 12.73 64 20.37 88 28.01
17 5.41 41 13.05 65 20.69 89 28.33
18 5.73 42 13.37 66 21.01 90 28.65
19 6.05 43 13.69 67 21.33 91 28.97
20 6.37 44 14 68 21.05 92 29.29
21 6.69 45 14.32 69 21.97 93 29.60
22 7 46 14.64 70 22.28 94 29.92
23 7.32 47 14.96 71 22.60 95 30.24
24 7.64 48 15.28 72 22.92 96 30.56
25 7.96 49 15.60 73 23.24 97 30.88
26 8.28 50 15.92 74 23.56 98 31.20
27 8.60 51 16.24 75 23.88 99 31.52
28 8.91 52 16.55 76 24.19 100 31.83
29 9.23 53 16.87 77 24.51 101 32.15
30 9.55 54 17.19 78 24.83 102 32.47
31 9.87 55 17.51 79 25.15 103 32.78
32 10.19 56 17.83 80 25.47 104 33.10
33 10.50 57 18.14 81 25.79 105 33.42
34 10.82 58 18.46 82 26.10 106 33.74
35 11.14 59 18.78 83 26.42 107 34.06
To Calculate Diameter of Gears when Distance Between
Centers and Ratio of Speed is Given.
When calculating gears to connect two shafts of given dis-
tance between centers and at a given ratio of speed, use the
formula,
_ 2 X S X n
d =
n + JV
2X S XN
n + N
D = Diameter of large gear.
d = Diameter of small gear.
iS" = Distance between centers in inches.
JV= Number of revolutions of large gear per minute.
n = Number of revolutions of small gear per minute.
Note.— The small gear is always on the shaft having the
greater speed.
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