View, ContinuedRevolutions(Continued)When revolving an object perpendicular to the front plane of projection, thedepth dimensions in the top and side views remain true and the size andshape of the front view remain the same. The top and bottom views are nowoblique to the horizontal plane of projection foreshortening the lengthdimensions. The side surfaces are now oblique to the profile plane causingvertical dimensions to foreshorten. The amount of foreshortening worksitself out as you project the different views.Figure 3-47 shows a 30-degree revolution perpendicular to the front plane ofprojection.Figure 3-47.—Revolving the front plane of projection of an object 30aegrees from the perpendicular.Continued on next page3-53
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