# pitch circle

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Related to pitch circle: Pitch Diameter, Circular Pitch

## pitch circle

n
(Mechanical Engineering) 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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Gear measuring machines are equipment used to inspect gear tooth profiles, pitch circle diameter, roughness of gear surface and gear module.
Contract awarded for 2006ns18-set consisting 04 items.1 ms shim id:280mm, od: 330mm with 14mm dia hole 8 nos at 45 degree each and 12mm dia hole 8 nos at 45 degree each pitch circle dia = 304mm, thickness = 0.5mm = 01no.
The tooth surface pitting occurs mostly at the pitch of the splines, and the main contact portion of the two spline teeth in the meshing process is the pitch; in the meshing process, spline teeth have both relative rolling and relative sliding, and the relative sliding friction force is opposite in direction of the two sides of the pitch circle node; therefore, a pulsating load is generated, and the effect of these two forces results in pulsating cyclically varying shear stress at the depth of the gear index circle.
It is the radial distance of a tooth from the the pitch circle to the top of the tooth.
In the figure, F is nominal meshing force, i.e., the force tangential to the pitch circle. The former suffix is the element that is given the meshing force and the latter suffix is the one that gives the meshing force.
The correct assembly involved the preformed steelwork being cast into the concrete base using a series of jig rings to set the pitch circle location of the threaded foundation rods that would protrude from the base.
It is derived by dividing the diameter (mm) of the pitch circle by the number of teeth.
R is the crowning parameter and [r.sub.1] is the radius of pitch circle for the workpiece.
(1) Pitch circle: The circle through the pitch point having its center at the axis of the gear.
This will be seen as a polished worn strip, about the pitch circle diameter, on each of the teeth as shown in the diagram.
[r.sub.j] (j=1 ,2) = radius of pitch circle: (1=1) for pinion; (j=2) for gear rbij (i=c, d, j=1,2) = radius of base circles
So, we can also establish the ratio of the pinion tooth thickness on the pitch circle and gear tooth thickness on the pitch circle [S.sub.w1] / [S.sub.w2].

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