pitch surface

noun

1. (in a gear or rack) an imaginary surface forming a plane pitch plane, a cylinder pitch cylinder, or a cone or frustrum pitch cone that moves tangentially to a similar surface in a meshing gear so that both surfaces travel at the same speed.

Word History and Origins

Origin of pitch surface¹

First recorded in 1885–90

Example Sentences

We may also say that the pitch circle is the edge of the pitch surface.

From Project Gutenberg

The pitch-surface of a wheel lies intermediate between the points of the teeth and the bottoms of the hollows between them.

From Project Gutenberg