What is the term for the measurement along the chord at the pitch circle?

The correct term for the measurement along the chord at the pitch circle is chordal thickness. This measurement refers to the thickness of the tooth at the pitch circle, which is crucial in defining how the gears will mesh with each other. Understanding chordal thickness is important for gear design because it affects the strength of the teeth and the functioning of the gear pair.

This term is essential in ensuring that gears properly engage without excessive friction or wear, and it plays a significant role in calculating involute profiles and other gear parameters. By clarifying the dimensions involved at the pitch circle, engineers can create more efficient, reliable gear mechanisms.