Machinery's Handbook, 31st Edition
2532 COUPLINGS and Clutches indicated in Fig. 3; that is, so that a point a on the cutter at a radial distance d equal to one- half the depth of the clutch teeth lies in a radial plane. When it is important to eliminate all backlash, point a is sometimes located at a radial distance d equal to six-tenths of the depth of the tooth, in order to leave clearance spaces at the bottoms of the teeth; the two clutch members will then fit together tightly. Clutches of this type must be held in mesh.
x
B
Cutter
Clutch Bank
C
A
D
E
D 1
E 1
Fig. 4. Angle of Dividing-Head for Milling V-Shaped Teeth with Single-Angle Cutter
cos N ) cot θ α is the angle shown in Fig. 4 and is the angle shown by the graduations on the dividing head. θ is the included angle of a single cutter, see Fig. 1. 2 # α = tan (360° ⁄
360°/ N
Angle of Single-angle Cutter, θ
Angle of Single-angle Cutter, θ
60 °
70 °
80 °
60 °
70 °
80 °
No. of Teeth, N
No. of Teeth, N
Dividing Head Angle, α
Dividing Head Angle, α
5 6 7 8 9
18 19 20 21 22 23 24 25 26 27 28 29
27 ° 19.2' 55 ° 56.3'
74 ° 15.4'
83 ° 58.1'
86 ° 12.1' 88 ° 9.67'
60
71 37.6 81 13
84 18.8 86 25.1 88 15.9 84 37.1 86 36.6 88 21.5 84 53.5 86 46.9 88 26.5 85 8.26 86 56.2 88 31 85 21.6 87 4.63 88 35.1 85 33.8 87 12.3 88 38.8 85 55.2 87 25.7 88 45.3 86 4.61 87 31.7 88 48.2 86 13.3 87 37.2 88 50.8 86 21.4 87 42.3 88 53.3 85 45 87 19.3 88 42.2
68 46.7 76 48.5 83 39.2 73 13.3 79 30.9 84 56.5
75 58.9 81 13
85 45.4
10 11 12 13 14 15 16 17
77 53.6 82 24.1 86 19.6
79 18.5 83 17
86 45.1
80 24.4 83 58.1 87 4.94 81 17.1 84 31.1 87 20.9 82 .536 84 58.3 87 34 82 36.9 85 21.2 87 45 83 7.95 85 40.6 87 54.4 83 34.7 85 57.4 88 2.56
30 88 55.6 Cutting Saw-Tooth Clutches: When milling clutches having angular teeth as shown at B , Fig. 1, the axis of the clutch blank should be inclined a certain angle α as shown at A in Fig. 4. If the teeth were milled with the blank vertical, the tops of the teeth would incline towards the center as at D , whereas, if the blank were set to such an angle that the tops of the teeth were square with the axis, the bottoms would incline upwards as at E . In either 86 28.9 87 47
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