Concentricity and Symmetry


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Concentricity and Symmetry
Concentricity and SymmetryBoth concentricity and symmetry controls are reserved for a few unique tolerancing applications. The controls employ the same tolerancing concept but apply to different geometries. Concentricity controls features constructed about an axis, and symmetry controls features constructed about a center plane. Concentricity and symmetry both locate features by controlling their center points within a specified tolerance zone. They are typically used when it is important to accurately balance the mass of a part about its axis or center plane.
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Citation
Gene R. Cogorno: Geometric Dimensioning and Tolerancing for Mechanical Design. Concentricity and Symmetry, Chapter (McGraw-Hill Professional, 2006), AccessEngineering Export