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3.13 Hidden Lines and Centerlines

Hidden lines in a drawing represent the edges where surfaces meet but are not directly visible. Hidden lines are omitted from pictorial drawings unless they are needed to make the drawing clear. Figure 3.46 shows a case in which hidden lines are needed because a projecting part cannot be clearly shown without them. Sometimes it is better to include an isometric view from another direction than to try to show hidden features with hidden lines. You will learn more about hidden lines in Chapter 6.


3.46 Using Hidden Lines

Draw centerlines locating the center of a hole only if they are needed to indicate symmetry or for dimensioning. In general, use centerlines sparingly in isometric drawings. If in doubt, leave them out, as too many centerlines will look confusing.

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