The straightness callout can be used to keep this deviation of the derived median line within permissible limits. The amount of linear deviation in the axis is an important feature that must be controlled for a seamless assembly. The second function that this callout can control is the straightness of an axis. It is shown as two parallel lines (also parallel to the surface), one above and the other below the surface. In both cases, the tolerance zone forms a 2D plane. The second type is a cylindrical surface in the axial direction. The first type is a flat surface such as a face of a cube. Surface straightness controls the form of a line anywhere on the surface and has 2 types of applications: When we apply this callout to specify surface straightness, the tolerance zone forms a total wide zone above and below the ideal surface position and controls any deviations. Let’s see what we mean by either of these functions. It may be used to control the straightness of a surface or an axis.Īlso, the feature control frame is different in each case. It is the only callout that can control either lines on a surface or a FOS (feature of size). Straightness can control two very different types of functions. This callout sets a standard on how straight a feature must be along its length. The goal is to ensure it is straight enough for the application. Straightness tolerance is a 2-dimensional GD&T callout that controls the straightness of part features.
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