Orthographic Projections, ContinuedAnalyzing amultiviewprojectionChoosing thenecessary viewsIn third-angle projection, the plane of projection is always presumed to bebetween the object and the observer regardless of which view you areconsidering. Each view of the surface of an object is a view of that surfaceas it would appear to an observer looking directly at it. You should be ableto determine what each line in a particular view represents.A multiview projection should contain only as many views required todescribe the object fully. Most objects can be described in two or threeviews. One-view drawings are objects that can be completely defined by thatview. Features such as thickness or length is listed as a dimension or note.Many objects have no definite top or bottom. With objects of this kind,select a surface and call it according to convenience. When eliminatingviews, here are four rules to remember, (1) show an object in the position itcustomarily occupies, (2) a top view is preferable to a bottom view, (3) aright-side view is preferable to a left-side view, and (4) a view with a visibleline is preferable to a view with the same line shown as a hidden line.Figure 6-29 show a one-view drawing of a washer.Figure 6-29.—A one-view drawing.Continued on next page6-35
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
