Case

Product requirement

The profile is required to be contained within the bilateral tolerance zone.

Theoretical profile with bilateral tolerance zone

0.4 Normal to theoretical profile

Theoretical profile with bilateral tolerance zone

0.4 Normal to theoretical profile

The figure below shows an example where the toleranced profile of a feature has a sharp corner. The inner tolerance zone is considered to end at the intersection of the inner boundary lines, and the outer tolerance zone is considered to extend to the outer boundary-line intersections. Sharp corners such as these could allow considerable rounding; if this is desirable, then the design requirement must be clearly defined on the drawing by specifying a radius or adding a general note such as 'ALL CORNERS 0.5 MAX'. It should be noted that such radii apply regardless of the profile tolerance.

In the example given, the product is required to have a sharp corner.

Product requirement

Zone extends to this point

Zone extends to this point

Tolerance

zones

Tolerance

Drawing instruction

zones

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