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Originally Posted by Max Lobovsky
Yes, the pitch diameter is what you should use. If you don't know it, it is the Diametral Pitch (the number describing the size of the teeth 20, 24, etc) divided by the number of teeth. 40 tooth 20 pitch gear has a 2" pitch diameter.
You may also want to draw the overall diameter of the gear to check for interferences.
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If I am understanding this correctly, you are taking the Diametral Pitch (20) and dividing it by the # of teeth (40)..
20/40 = 1/2
Am I wrong?
(Just trying to fix any confusion this could cause
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