Section Views - 14040_42

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with figure 3-15 together with the other information. It should clearly explain the reading of the auxiliary view. Figure 3-16 shows a side by side comparison of ortho- graphic and auxiliary views. View A shows a fore- shortened orthographic view of an inclined or slanted surface whose true size and shape are unclear. View B uses an auxiliary projection to show the true size and shape. The projection of the auxiliary view is made by the observer moving around an immovable object, and the views are projected perpendicular to the lines of sight. Remember, the object has not been moved; only the position of the viewer has changed. Section Views Section views give a clearer view of the interior or hidden features of an object that you normally cannot see clearly in other views. A section view is made by visually cutting away a part of an object to show the shape and construction at the cutting plane. Figure 3-15.—Viewing an inclined surface, auxiliary view. Figure 3-16.—Comparison of orthographic and auxiliary projections. Notice the cutting plane line AA in the front view shown in figure 3-17, view A. It shows where the imaginary cut has been made. In view B, the isometric view helps you visualize the cutting plane. The arrows point in the direction in which you are to look at the sectional  view. View C is another front view showing how the object would look if it were cut in half. In view D, the orthographic section view of section A-A is placed on the drawing instead of the confusing front view in view A. Notice how much easier it is to read  and  understand. When sectional views are drawn, the part that is cut by the cutting plane is marked with diagonal (or crosshatched),  parallel  section  lines.  When  two  or  more parts are shown in one view, each part is sectioned or crosshatched with a different slant. Section views are necessary  for  a  clear  understanding  of  complicated parts. On simple drawings, a section view may serve the purpose of additional views. Figure 3-17.—Action of a cutting plane. 3-6

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