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Chapter 4. The Basic Drawing Objects > Working with Construction Lines

Working with Construction Lines

On some occasions, construction lines are needed to visually demonstrate relationships within the drawing. Although the Object Tracking feature works similarly to having a temporary construction line, you may need an actual drawing object when setting up a drawing to represent an association between two or more drawing elements (for example, laying out the top, front, and side views of a mechanical drawing). AutoCAD has two line elements, Xlines and rays, specifically for this purpose.

Xlines

Xlines, or construction lines, enable you to create horizontal, vertical, or diagonal lines that run in both directions from a midpoint to infinity. Although they run beyond the boundary of your defined working space, Xlines are not taken into consideration when viewing the extents of your drawing. Xlines can be extremely handy when used in a drawing, either by offsetting a specific distance from an element or when bisecting angles. Figure 4.1 illustrates the use of Xlines in a three view instrumental drawing.


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