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FP gear
The Fisher-Price gear is a 32 Diametral Pitch gear. The number of teeth differ from year to year and I do not have one in front of me at the moment. To get pitch diameter, take the number of teeth and divide by the pitch diameter. If we had a 16 tooth gear with a 32 DP, then the pitch diameter is 1/2". The pressure angle is 20 degrees (pretty standard).
-Paul
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