Line Conventions, ContinuedExtension linesExtension lines are thin lines that extend from the object outline or point onthe object to a place outside the image area. Extension lines define areas fordimensions. You should leave a 1/16" gap between the object outline orpoint on the object and the beginning of the extension line.Extension linesproject 1/8" beyond the outermost dimension line. Extension and dimensionlines are drawn at right angles to each other.Figure 3-12 showsextension and dimension lines.Figure 3-12.—Extension and dimensionlines.When extension lines must cross each other or object outlines, break theextension lines.Figure 3-13 illustrates the correct and incorrect use of extension lines.Figure 3-13.—Extension lines drawn correctly andincorrectly.Continued on next page3-17
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