Profile of a Line
Line profile is much like surface profile except that it is a 2D check. The tolerance zone is normal to the surface profile of the feature at a cross-section. This can be a useful if you want to evaluate a single portion of a surface at a location or a set of parallel location evaluated in cross sections.
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You must associate a direction object (SA object) with the line profile annotation. This direction object defines the direction along which the data is divided into cross-sections for analysis.
Evaluation Process within SA:
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The direction vector for analysis is established from the direction object chosen.
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Cross sections are established along this direction vector and the data is divided into groups.
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A plane is fit to the first point in each cross section group (using the actual feature direction vector) and then the points are projected onto that plane.
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Measurements are allowed to rotate based on the datum constraints to minimize the point deviations.
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The extent of the max point deviation doubled to describe the fit deviation zone and compared to the tolerance to evaluate the check.