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Home > Terms > English, UK (UE) > Pinion
Pinion
A small toothed wheel driven by a gear. In clock gear trains a pinion is usually the smaller driven member, and normally has less than 20 teeth, which are termed 'leaves'. The hypocycloidal form is mostly used for pinion leaves. A hypocycloidal curve is that traced by a point on the circumference of a circle rolling inside another circle.
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- Part of Speech: noun
- Synonym(s):
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- Industry/Domain: Chronometry
- Category: Clock
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