pitch circle

nounMachinery.

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.

Words Nearby pitch circle

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use pitch circle in a sentence

And to pencil in the teeth these circles must be fully drawn, as in Figure 234, in which P P is the pitch circle.
Mechanical Drawing Self-Taught | Joshua Rose
Where these divisions intersect the pitch circle are the centres from which all the teeth curves may be drawn.
Mechanical Drawing Self-Taught | Joshua Rose
When two gears of equal size mesh together, the pitch line, or the pitch circle, as it isp.
Practical Mechanics for Boys | J. S. Zerbe
In fact, if a jewel pin was set to engage the fork on the pitch circle b a, the escapement would lock.
Watch and Clock Escapements | Anonymous
The circle b b represents the pitch circle of the jewel pin, and the circle at c c the periphery of the guard or safety roller.
Watch and Clock Escapements | Anonymous

British Dictionary definitions for pitch circle

pitch circle

noun

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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