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3 8o GEAR TEETH.
The whole depth is nearly equal to 0.6866 times the circular
pitch. The use of the following tables will facilitate calcula-
tions regarding dimensions of teeth in diametral pitch.
TABLE No. 48.—Comparing Circular and Diametral Pitch.
Diametral Pitch. Circular Pitch. Circular Pitch. Diametral Pitch.
2 1.571 inch. \y
2 inch. 2.094
2^ 1.257 ’
ItV 2.185
3 1.047 ’
ltt 2.285
3/
2 0.898 ’
lf
5
6
2.394
4 0.785 ’
IX 2.513
5 0.628 ’
1A 2.646
6 0.524 ’
IX
’
2.793
7 0.449 ’
ItV 2.957
8 0.393 ’
1 3.142
9 0.349 ’
il 3.351
10 0.314 ’ 7
/s 3.590
11 0.286 ’
tI 3.867
12 0.262 ’
U 4.189
14 0.224 ’
1
1
1 6 4.570
16 0.196 ’
n 5.027
18 0.175 ’
9
1 6 5.585
20 0.157 ’
% 6.283
22 0.143 ’
tV 7.181
24 0.131 ’
X 8.378
26 0.121 ’
A 10.053
28 0.112 ’
% 12.566
30 0.105 ’
A 16.755
32 0.098 ’
% 25.133
TABLE No. , jo.—Giving Dimensions of Teeth Calculated
According to Diametral Pitch.
Diametral
Pitch.
Depth
Cut in
to be
Gear.
Thickness of
Tooth on
Pitch Line.
Diametral
Pitch.
Depth to be
Cut in Gear.
Thickness of
Tooth on
Pitch Line.
2 1.078 in. 0.785 in. 12 0.180 in. 0.131 in.
2/
2 0.863 0.628 14 0.154 0.112
3 0.719 0.523 16 0.135 0.098
sy
2 0.616 0.448 18 0.120 0.087
4 0.539 0.393 20 0.108 0.079
5 0.431 0.314 22 0.098 0.071
6 0.359 0.262 24 0.090 0.065
7 0.307 1
0.224 26 0.083 0.060
8 0.270 0.196 28 0.077 0.056
9 0.240 0.175 30 0.072 0.052
10 0.216 0.157 32 0.067 0.049
11 0.196 0.143
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