(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.
Origin of pitch surface
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for pitch surface
Historical Examples of pitch surface
The pitch-surface of a wheel lies intermediate between the points of the teeth and the bottoms of the hollows between them.