The median points of the opposed surface elements for the controlled feature must lie within the cylindrical/spherical Concentricity tolerance zone. The size of the tolerance zone indicates how congruent the median points are supposed to be with respect to the datum axis/point. It is also to be noted that the controlled feature must also lie within the size limits. Concentricity is thus a 3D control for the median points of the controlled feature. The opposed elements are diametrically opposite for a cylinder and sphere. Concentricity is that condition where the median points of opposed surface elements of the above features are congruent with a datum axis (for controlling a cylinder) or congruent with a datum point (for controlling a sphere). a cylinder) or features that have radially disposed elements about a point (e.g. It is also mandatory that the datum is also specified at RMB (Regardless of Material Boundary) condition.Ĭoncentricity is applicable for features which are either surfaces of revolution (e.g. For spheres, the tolerance zone is spherical centered about the datum point whereas for cylinders, the tolerance zone is cylindrical centered about the datum axis.Ĭoncentricity can be applied for the controlled featured only at RFS (Regardless of Feature Size) condition which means that the feature controlled with Concentricity cannot have a material condition modifier like M or L. Concentricity is a Location tolerance defined in ASME Y14.5-2009 which can be specified for spheres and cylinders (including all surfaces of revolution), though it is used very rarely.
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