Machinery's Handbook, 31st Edition
2212 Spur Gearing American National Standard and Former American Standard Gear Tooth Forms ANSI B6.1-1968, (R1974) and ASA B6.1-1932
p
φ
a
h t
h k
t
b
c
r f
a = addendum b = dedendum c = clearance
h k = working depth h t = whole depth p = circular pitch
r f = fillet radius of basic rack t = circular tooth thickness — basic φ = pressure angle
Basic Rack of the 20-Degree and 25-Degree Full-Depth Involute Systems
Basic Tooth Thickness
Circular Pitch
14 1/2°
Addendum Minimum Addendum
Minimum Total Depth
Working Depth
Minimum Clearance
2 -Degree Full-Depth Involute System
Basic Rack of the 14 1 ∕
Basic Tooth Thickness
Circular Pitch
20°
Addendum Minimum Addendum
Working Depth
Minimum Total Depth
Minimum Clearance
Basic Rack of the 20-Degree Stub Involute System
3.1416 2DP
3.1416 2DP
3.750 DP
14 1/2°
3.750 DP
1 DP
0.56278 DP
0.37614 DP
0.75228 DP
1.157 DP
0.77703
0.157 DP
(MIN)
DP
0.56278 DP
2.94243 DP
4.51323 DP
2 -Degree Composite System
Approximation of Basic Rack for the 14 1 ∕
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