# Figure 6 18 perpendicularity of a plane surface

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Figure 6-18 Perpendicularity of a plane surface: problem 1.1.Specify the 3.00-inch surface of the part in Fig. 6-18 perpendicular to the bottom and back surfaces within a tolerance of .010. Draw and dimension the tolerance zone.
2.Specify the Ø1.00-inch pin perpendicular to the top surface of the plate in Fig.6-19 within a tolerance of .015 at MMC. On the drawing, sketch and dimension a gage used to inspect this part.Geometric Dimensioning and Tolerancing for Mechanical Design Answer Guide404.00.0103.00
.010ABB
Figure 6-20 Parallelism of a plane surface: problem 3.3.Specify the top surface of the part in Fig. 6-20 parallel to the bottom surface within a tolerance of .004. Draw and dimension the tolerance zone.Figure 6-21 Angularity of a plane surface: problem 4.Geometric Dimensioning and Tolerancing for Mechanical Design Answer Guide41.XX = ± .01ANGLES = ± .004AA1.001.002.00.0044.002.0020°6.00.003A2.75A.XX= ± .01ANGLES = ±1.00.003
4.In Fig. 6-21, specify the top surface of the part to be at an angle of 20° to the bottom surface within a tolerance of .003. Draw and dimension the tolerance zone.MMC.9901.015Geometric Tolerance+.010.015Virtual Condition1.0001.000Figure 6-22 Orientation: problem 5.5.Complete the feature control frames in Fig. 6-22 so that the two parts will always assemble, datum features A & B will meet, and the part can be produced using the most cost effective design. The pin is machined in a lathe and the hole is drilled.(There are several possible solutions to this problem. The virtual conditions should be equal to insure assembly and to provide maximum tolerance. Typically, for this method of manufacturing, more tolerance is given to the hole.)Geometric Dimensioning and Tolerancing for Mechanical Design Answer Guide42.010MA.980-.9901.015-1.030A.015MBB
Chapter 7Position, GeneralChapter ReviewPage 1251.Position is a composite tolerance that controls both the location andthe orientation of feature of sizes at the same time.2.The tolerance of position may be viewed in either of two ways:A theoretical tolerance zonelocated at true position of the toleranced feature within which the center point, axis, or center plane of the feature may vary from true position.A virtual condition boundaryof the toleranced feature, when specified at MMC or LMC and located at true position, which may not be violated by its surface or surfaces of the considered feature.3.A feature of size has four geometric characteristics that must be controlled. These characteristics are size, form, orientation, and location.4.Since the position tolerance only controls feature of sizes such as pins, holes, tabs, and slots, the feature control frame is always associated with a size dimension.