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Cylindricity Tolerance

Cylindricity describes a condition of revolution in which all points of a surface are equidistant from a common axis.
 
Cylindricity defines how much a cylindrical surface can vary from being a perfect cylinder. Cylindricity is the condition of a surface of revolution in which all points of the surface are equidistant from a common axis. A cylindricity control is a geometric tolerance that limits the amount of cylindricity error permitted on a cylindrical part surface.
 
The tolerance range is the range contained between two coaxial cylinder surfaces separated by distance t.
 
The considered surface shall be contained between two coaxial cylinder surfaces separated by 0.1mm.
 
A cylindricity tolerance specifies a tolerance zone bounded by two concentric cylinders within which the surface must lie. In the case of cylindricity, unlike that of circularity, the specified tolerance applies simultaneously to both circular and longitudinal elements of the surface, i.e., cylindricity applies to the entire part surface to which the control is applied. Cylindricity is a 3D tolerance control.
 
Cylindricity is one of the more challenging tolerances to inspect. It requires isolating the feature from the rest of the part since there can never be a datum referenced with cylindricity.

 

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