An imaginary surface passing through the teeth of one cogwheel, pinion, rack, etc., so as to touch the corresponding surface in another, without sliding, when the two components are geared together.
Origin
Mid 19th century; earliest use found in Macquorn Rankine (1820–1872), civil engineer and physicist.
Definition of pitch surface in US English:
pitch surface
noun
Mechanics
An imaginary surface passing through the teeth of one cogwheel, pinion, rack, etc., so as to touch the corresponding surface in another, without sliding, when the two components are geared together.
Origin
Mid 19th century; earliest use found in Macquorn Rankine (1820–1872), civil engineer and physicist.