pitch surface

American  

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.

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Etymology

Origin of pitch surface

First recorded in 1885–90

Example Sentences

They confidently handled the artificial pitch surface and a temperature that dipped to around -10 with added wind chill, to be expected at a stadium from which the town’s illuminated ski slopes were visible just over the lake covered by its deep snowy blanket.

From The Guardian

And that’s before you’ve considered the variations in temperature, altitude and pitch surface.

From The Guardian

Pitch Circle.—A section of the pitch surface of a toothed wheel by a plane perpendicular to its axis is a circle, and is called a pitch circle.

From Project Gutenberg

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

From Project Gutenberg

This is done by dividing the pitch surface by V-shaped grooves, the sides of the grooves being radii of the circular surface, so that the central parts of the mirror get most of the polishing action.

From Project Gutenberg