MTF
[PuristS]
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Pinions for non-watchmakers
The current Mrs MTF tells me that a pinion is:
usually the smallest gear in a gear drive train.
OR
a smaller gear that drives in a 90-degree angle towards a crown gear in a differential drive.
I think she reads books 
Regards,
MTF
PS. If the drive train only has 1 wheel, is that ....er..."pinion" also the "drive gear"?
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Pinions for non-watchmakers
The current Mrs MTF tells me that a pinion is: usually the smallest gear in a gear drive train. OR a smaller gear that drives in a 90-degree angle towards a crown gear in a differential drive. I think she reads books Regards, MTF PS. If the drive train on...