Are you sick of tooth approximations that just do not fit in your model. Here is my answer. The involute profile is approximated by a spline with 10 points minimum.
The Real Involute Gear ProfileRight mouse pick - save as
Involute Gear, Use as a template, not an iPart. 12 tooth to 400 tooth. Diametral pitch -- 1/2 to 36, pressure angle 14 1/2, 20 and 25 degrees. Yes, there is a extra spread sheet for doing the bores and keyways. Download the 

file, -- 480k R5.3
Internal Involute Gear, As above but. 24 tooth to 400 tooth. Diametral pitch -- 1/2 to 36, pressure angle 14 1/2, 20 and 25 degreesDownload the file, file 101k
Do you need more power transmission parts? Electric Motors? etc.
Charles Bliss Power Transmission Web Page.
Link to Charles Bliss Power Transmission 

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