Figure 5-15.-Improved spacing for three-view projection of object shown in figure 5-18.figure 5-14, you can now call the front; it followsthat which appears as the front in figure 5-14appears as the bottom in figure 5-15. Again theright side view appears, but it now appears in theupper, rather than the lower, right corner andvertically rather than horizontally.Spacing views in a drawing of a circularobject is like spacing letters; you try to equalizethe areas of the spaces around and between theviews. Figure 5-16 shows properly spaced two-view drawings of a perforated disk. For theviews that are horizontally in line, you locatethe horizontal center line midway between thehorizontal margins; for the views that arevertically in line, you locate it midway betweenthe vertical margins. The other spacing is asindicated. To determine the lengths of distancesA and 2/3 A, set a compass to the diameter plusthe thickness of the disk, and lay off this distanceon the margin. Then divide the remaining segmentof the margin into three intervals, two of thembeing equal, and the third one being 1 1/2 timesas long as each of the others.VIEW ANALYSIS.— You must be able toanalyze a multi-view projection or, in other words,to determine what each line in a particular viewrepresents. In this connection, it is helpful toremember that in a third-angle projection, theplane of projection is always presumed to bebetween the object and the observer, regardlessFigure 5-16.-Spacing of views of a circular object,5-9
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