Involute spur gear design

For the purpose of reversed engineering of spur gear with involute profile, this calculator will help you calculate the different parameters of spur gear.

In most cases, number of teeth is a number that 360 can be divided by: 3,4,5,6,9,10,12,15,18,20,24,30,36,... etc

Smaller module means smaller teeth and vise versa

Gear base tangent method (David Brown tangent comparator):

Inputs:

Total number of gear teeth:


Measured span [mm]:


Number of gear teeth within the span:


Pressure angle [deg]:
25° 20° 14.5°

Outputs:

Standard module [mm]:


Addendum [mm]:


Dedendum [mm]:


Outer diameter (Addendum diameter) [mm]:


Pitch circle diameter [mm]:


Base circle diameter [mm] from which the involue profile will be drawn:


Root circle diameter [mm]:


Clearance [mm]:


Fillet radius (recommended) [mm]:


Four-points distance (for even teeth count) [mm]:


Angular pitch [deg]:


Involute angle upper limit (used in parametric equation):
rad deg

Keywords:

Online spur gear calculator

Draw old spur involute gear - Measure old spur involute  gear - Replace old gear

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Gear base tangent method - Gear span measurement

Involute profile spur gear calculator

Draw involute spur gear in solidworks

References:

http://www.engineersedge.com/gear_formula.htm

https://en.wikipedia.org/wiki/Involute

https://en.wikipedia.org/wiki/Pressure_angle

http://www.otvinta.com/gear.html

http://www.geartechnology.com/issues/0100x/regalado.pdf

http://www.tandwiel.info/en/gears/measurement-over-multiple-teeth-or-base-tangent-length/

Handbook: "Metrology And Quality Control" by A.M.Badadhe‏