Figure 8-11.—Development of a truncated pyramid.view D to the upper horizontal line on the front view(point Y), and the other from X to the lower horizontalline of the front view (point 2). Draw a line from theapex through points Y and 2 in view D. The distancebetween points Y and Z equals the true length of thetruncated pyramid With the compass point at the apexof view E, find any convenient point to the right of theorthographic view, scribe an arc with a radius equal tothe distance between the apex and point Y in view D,and a second arc with a radius equal to the distancebetween the apex and point Z in view D. The two arcsare shown in view E. Draw a radial line beginning atthe apex and cutting across arcs Y and Z in view E. Stepoff lengths along these arcs equal to the length of thesides of the pyramid: MN for the inside arc and OP forthe outside arc (view E); the lengths MN and OP aretaken from the orthographic view in view D. Connectthe points along each arc with heavy lines (for example,points MN along the inner arc and points OP along theouter arc); Also use light lines to connect the apex withpoints M and 0, and the apex with points N and P, andso on, as shown in view F.View G is the completed stretchout of a truncatedpyramid complete with bend lines, which are marked(X).PARALLEL-LINE DEVELOPMENTLook at figure 8-12 as you read the followingmaterial on parallel-line development.8-8
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