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Topic 2: Lines and Shapes
A draftsman uses many different kinds of lines. Each kind of line has a different meaning. The different line types we use are also industry standards.
Line types: ◦ Visible Edge ◦ Invisible Edge (Hidden Lines) ◦ Center Lines ◦ Projection Lines ◦ Dimension Lines
Visible Edge Lines: ◦ Edges of an object which you can see when you look at the object. ◦ They are drawn with solid lines are darker pencil lines and medium thickness
Invisible Edge (Hidden Lines): ◦ Edges of an object which you cannot see when you look at the object. ◦ They are drawn with short dashes and are always light pencil lines and thin lines.
Center Lines: ◦ Are used to show the centers of circles and round objects. ◦ They are drawn with long dashes alternating with short dashes and are always light and thin lines.
Projection Lines: ◦ Are used to connect parts of one view of an object with corresponding parts of another view of that object. ◦ They are drawn with long dashes and very light lines.
Dimension Lines: ◦ Are used with figures (numbers) and arrowheads to show the sizes of an object. ◦ They are always drawn with light thin lines.
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