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					BevelGears.xls
Spreadsheet to estimate bevel gear tooth strength
Production gears must be designed using AGMA standards


Inputs
Number of Teeth, Subject gear, N                     24   Stress Outputs
Number of Teeth, Mating gear, Nm                     48   AGMA Bending Stress (psi)
Pitch Diameter, Subject Gear, D (inches)              1
Face Width, Subject Gear, F (inches)               0.25   Shear of the tooth (F/A) (psi)
Torque, Subject Gear, T (in-lbs)                     42   Beam Bending Stress (psi)
                                                          Scale (Beam Bending/AGMA)

AGMA Geometry Factor, J                            0.25
(See chart to right)

Geometry Outputs
Pitch Angle (Subject), G                         0.4636
Pitch Angle (Mating), g                          1.1071
Gear Ratio                                       0.5000
Cone Distance, Ao                                1.1180
Diametrical Pitch, P                            24.0000
Tangential Force at large end of tooth, Wto     84.0000
Tangential Force at Middle of Face              94.5737
Tooth Thickness, Large End, tt                   0.0654
Diameter@Small end of tooth                      0.7764
Tooth Thickness, Small End tts                   0.0508
Circular Pitch, p                                0.1309
Chordal area, Ac                                 0.0145
Moment of Intertia, I                         4.158E-06
Distance Nuetral axis to outer fiber, cc         0.0327
Back Cone Radius, Rb                             0.5590



Tredgold ToothShape Approximation
"Imaginary spur gear"
Number of Teeth on imaginary gear, N'          26.8328
Pitch Diameter of imaginary gear, D'            1.1180
Diametrical Pitch of imaginary gear, P'        24.0000
Addendum, a (inches)                            0.0417
Dedendum, b (inches)                            0.0521
Tooth Height (inches) (Not used)                0.0938
32256

  5780
 34436
1.0676
0

				
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