Gear Drawing Software

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how to find out the profile of spur gear?

I need to draw a spure gear in ansys software.
for that i need set of co-ordinates of the tooth profile ( involute and envilope of trochoid) ;
The input parameter to calculate are
pressure angle, module , no of teeth, cutter tip radius, profile shift factor, addendum , dedendum

If you just need to draw a gear, I'd make trapezoidal teeth. If you seriously need an involute CAD model, I'd try contacting a gear manufacturer and downloading some of their CAD.

The involute profile is only good above the pitch circle. Below the pitch circle, the tooth is relieved to allow room for the mating tooth.

See references below:

Autocad Internal Gear Demo


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