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Profile Tolerance of Line

Profile of a Line is the condition permitting the amount of profile variation, either unilaterally or bilaterally along a line element of a feature.
 
The tolerance range is the range contained between the two envelope curves formed by a circle with diameter t, the centre of which is situated on the theoretically correct profile curve.
 
In any cross-section parallel to the projection plane, the considered profile shall be contained between the two envelope curves formed by a 0.04mm diameter circle, the centre of which is situated on the theoretically correct profile curve.
 
The tolerance zone established by the profile of a line tolerance is two-dimensional, extending along the length of the considered feature. This applies to the profiles of parts having a varying cross section, e.g., the tapered wing of an aircraft, or to random cross sections of parts, where it is not desired to control the entire surface of the feature as a single entity.

 

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