Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Adobe Press products and services that can be purchased through this site. The third-angle projection presents a right side view, whereas the first-angle projection presents a left side view. The top views are the same, but are in different locations. The front view in both projections is the same. However, there is so much international commerce happening today that you should be able to work in both conventions, just as you should be able to work in both inches and millimeters.įigure 4-54 shows a three-dimensional model and three orthographic views created using third-angle projection and three orthographic views created using first-angle projection. This chapter has presented orthographic views using third-angle projections as defined by ANSI. Some countries other than the United States use first-angle projection. See the American Society of Mechanical Engineers (ASME) publication ASME Y14-3-2003. The ANSI calls for orthographic views to be created using third-angle projection and is the accepted method for use in the United States. There are two sets of standards used to define the projection and placement of orthographic views: the ANSI and the ISO.
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