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pitch circle

noun

, Machinery.
  1. 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.


pitch circle

noun

  1. 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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Word History and Origins

Origin of pitch circle1

First recorded in 1810–20
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Example Sentences

And to pencil in the teeth these circles must be fully drawn, as in Figure 234, in which P P is the pitch circle.

Where these divisions intersect the pitch circle are the centres from which all the teeth curves may be drawn.

When two gears of equal size mesh together, the pitch line, or the pitch circle, as it isp.

In fact, if a jewel pin was set to engage the fork on the pitch circle b a, the escapement would lock.

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.

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pitch chiselpitch-cone angle