The Lewis Equation
Safe material stress
(psi)
Thickness of the gear
(inch)
Diametral pitch of gear
(inch)
Pitch line velocity
(ft/min)
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
28
30
32
34
35
36
38
40
45
50
55
60
65
70
75
80
90
100
150
200
300
Number of gear teeth
-
20.0
14.5
Pressure angle
(degree)
Tooth form factor
-
Tooth load along pitch line
(lbs)