A third-angle projection brought into a single plane

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 5-8.-A third-angle projection brought into a single plane. Again you assume that the vertical plane is already in the plane of your drawing paper. To get the other two views into the same plane, you rotate them both clockwise. Figure 5-8 shows a third-angle projection of an object brought into a single plane. The top view is above the front view; the Figure 5-9.-Method of making a third-angle projection. right side of the object, as shown in the front view, is toward the right side view; and the top, as shown in the front view, is toward the top view. Figure 5-9 shows the basic principles of the method by which you would actually make the projection shown in figure 5-8. Draw a horizontal line AB and a vertical line CD, intersecting at O. AB represents the joint between the horizontal and the vertical plane; CD represents the joint between these two and the profile plane. Any one of the three views could be drawn first, and the other two projected from it. Assume that the front view is drawn first on the basis of given dimensions of the front face. Draw the front view, and project it upward with vertical projection lines to draw the top view. Project the top view to CD with horizontal projection lines. With O as a center, use a compass to extend these pro- jection lines to AB. Draw the right side view by extending the projection lines from AB vertically downward and by projecting the right side of the front view horizontally to the right. 5-5

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