pitch surface


noun

(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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Origin of pitch surface

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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