Straightness is related to variation on a straight line. Well not direct relation, each has its different meaning. Relation between Straightness and flatness The ID of the cylinder gauge represents the maximum virtual condition of the part. This is both a control of the diameter and of the axial straightness. To ensure that a part or feature is axially straight, a cylinder gauge is used to determine if the part fits in its total envelope at MMC. It is defined as the variance of the surface within a specified line on that surface.Īxis straightness:– Axis straightness is actually a 3D tolerance that constrains the center axis of the part preventing it from bending or twisting too far. Surface Straightness:- The standard form of straightness is a 2-Dimensional tolerance that is used to ensure that a part is uniform across a surface or feature. There are two types a ) Surface straightness b) Axis straightness. Or derived median line mean- Exact center line of part. A straightness tolerance is applied in the view where the elements to be controlled are represented by a straight line.įrom definition- an element of a surface mean edge of part, Bottom face, side face, etc. A straightness tolerance specifies a tolerance zone within which the considered element of a surface or derived median line must lie. According to ASME Y14.5-2009 definition of straightness is as belowĭefinition:– Straightness is a condition where an element of a surface, or derived median line, is a straight line.
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