Bidirectional Positional Tolerancing Of Features

Where it is desired to specify a greater tolerance in one direction than another, bidirectional positional tolerancing may be applied. Bidirectional positional tolerancing results in a noncylindrical tolerance zone for locating round holes; therefore, the diameter symbol is omitted from the feature control frame in these applications.

Diameter SymbolsDrawing With Positional Tolerancing

FIG. &-36 NONPARALLEL HOLES INCLUDING THOSE NOT NORMAL TO SURFACE

Bidirectional Positional Tolerance
FIG. 5-37 SAME POSITIONAL TOLERANCE FOR HOLES AND COUNTERBORES, SAME DATUM REFERENCES

FIG. 6-36 DIFFERENT POSmONAL TOLERANCES FOF HOLES AND COUNTERBORES, SAME DATUM REFERENCES

Datum plane

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  • natalino
    How to use positional feature control frame?
    8 years ago

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