In my design of a spurgear the root diameter in pinion is less than the base diameter but in the gear the base diameter is less than the root diameter.


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    $\begingroup$ I think your question is related to this question $\endgroup$
    – NMech
    Nov 17, 2021 at 15:31
  • $\begingroup$ You are probably undercutting the pinion, likely if it has a low number of teeth. Answer @NMech linked goes into deeper detail. $\endgroup$
    – jko
    Nov 18, 2021 at 13:42


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