Pitch circle — Free Mechanical Engineering Illustration | GPAI | GPAI

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Pitch circle — Free Mechanical Engineering Illustration | GPAI | GPAI

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Pitch circle

Pitch circle

Mechanical Engineering

Pitch circle

A thin, perfectly round circular construction line centered on the gear axis, representing the theoretical rolling circle or pitch diameter. Drawn as a clean technical drafting element, usually dashed or as a very fine solid reference line, with no fill, teeth, hub, or other surrounding gear details. The circle is concentric with the gear and functions as a nominal reference circle, typically located between the addendum and dedendum circles or through the mid-height of the teeth in a gear diagram.

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