Projected Tolerance Zone

Perpendicularity Tolerance

The application of this concept is recommended where the variation in perpendicularity of threaded or press-fit holes could cause fasteners, such as screws, studs, or pins, to interfere with mating parts. See Fig. 5-31. An interference can occur where a tolerance is specified for the location of a threaded or press-fit hole, and the hole is inclined within the positional limits. Unlike the floating fastener application involving clearance holes only, the attitude of a fixed fastener is governed...

Hole Pattern Dimensioning

Hole Pattern Dimensioning

00.25 feature-relatinfl tolerance zone cylinders 6 zones, basically related to each other and oriented to the datum 00.25 feature-relatinfl tolerance zone cylinders 6 zones, basically related to each other and oriented to the datum Actual feature axes must simultaneously lie within both tolerance zones -00.8 pattern-locating tolerance zone cylinders 6 zones, basically related to each other, basically located to the datums Actual feature axes must simultaneously lie within both tolerance zones...

Multiple Datum Reference Frames

More than one datum reference frame may be necessary for certain parts, depending upon functional requirements. In Fig. 4-24, datum features A, B, and C establish one datum reference frame, while datum features D, B, and C and datum features D, E, and B establish different datum reference frames. 4.5.11.1 Functional Datum Features. Only the required datum features should be referenced in feature control frames when specifying geometric tolerances. An understanding of the geometric control...

Calculating Positional Tolerance

True Positional Tolerance

Figure 5-9 shows a drawing for one of two identical plates to be assembled with four 14 mm maximum diameter fasteners. The 14.25 minimum diameter clearance holes are selected with a size tolerance as shown. Using conventional positional tolerancing, the required tolerance is found by the equation as given in para. B3 of Appendix B. T H - F 14.25 - 14 0.25 diameter Cylindrical tolerance zone equal to positional tolerance Axis of hole at true position Axis of hole Is Axis of hole Is located Axis...

Fig Radial Hole Pattern Located By Composite Positional Tolerancing

Cad Drawing Hole Position Tolerance

FIG. 6-24 RADIAL HOLE PATTERN LOCATED BY COMPOSITE POSITIONAL TOLERANCING CONT'D Tolerance Zones for Radial Hole Pattern FIG. 6-24 RADIAL HOLE PATTERN LOCATED BY COMPOSITE POSITIONAL TOLERANCING CONT'D Tolerance Zones for Radial Hole Pattern 4X 00.6 pattern-locating tolerance zone cylinders at MMC. Pattern-locating tolerance zone framework PLTZF la located and oriented relative to datum plane A and datum axis B no rotational requirements r 4X 00.25 feature-relating tolerance zone cylinders at...