Straightness and circularity are great for controlling straight lines and circles respectively. Profile of a line vs straightness/circularity tolerance Profile of a line controls individual line elements on a single cross-section or any other linear feature, whereas surface profile controls the entire curved surface by taking the variance of adjacent cross-sections into account. In fact, it is the 3D equivalent of the line profile tolerance. The profile of a surface tolerance, is most closely associated with profile of a line. Profile of a line vs profile of a surface Every point on the actual curve must lie between these two lines of the tolerance zone for approval. The distance between the two parallel curves is the tolerance limit. Unless stated otherwise, these parallel lines are assumed to be equidistant from the true profile. The tolerance zone is made of two parallel lines that follow the true profile in either direction. The actual curve must conform as much as possible to this true profile. The actual curve is evaluated with respect to this true contour. The line profile tolerance creates a true profile where the curve should ideally be located. The callout simply mimics the curve irrespective of the complexity. These could be simple or advanced algebraic curves.
The line profile callout is typically used in the case of complex curves. This callout can only be used on surfaces and cannot be used to locate a central axis or plane. We can use it to control the form, location, orientation and size of a feature. The profile of a line tolerance is a 2D GD&T callout that can define and control a linear/curved feature or a surface cross-section within specified limits. VI Uses for Profile of a Line Tolerance What Is Profile of a Line in GD&T?
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