pitch circle

pitch circle

noun Machinery.
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.
Also called pitch line.


Origin:
1810–20

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World English Dictionary
pitch circle
 
n
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

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