- an imaginary circle within the profiles of the teeth of a gear, such that it rotates against a similar circle rotating at the same rate on a meshing gear.
Origin of pitch circle
First recorded in 1810–20
Also called pitch line.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for pitch circle
Let BB be part of the pitch-circle, and a the point where a tooth is to cross it.
The distance, measured along the pitch-circle, from the face of one tooth to the face of the next, is called the pitch.
- an imaginary circle passing through the teeth of a gearwheel, concentric with the gearwheel, and having a radius that would enable it to be in contact with a similar circle around a mating gearwheel