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.
FIG. &-36 NONPARALLEL HOLES INCLUDING THOSE NOT NORMAL TO SURFACE
FIG. 6-36 DIFFERENT POSmONAL TOLERANCES FOF HOLES AND COUNTERBORES, SAME DATUM REFERENCES
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