Today's curious story is "CAD line type"

The drawing consists of a combination of various shapes and symbol lines. In order to understand drawing features, it is necessary to read various information such as symbols and annotations, but knowing what each line has and how to apply it will help you to interpret the drawing.

<Figure 1-1 CAD line type>

Figure 1-1 lists commonly used lines in CAD. 

1. Solid Line, Thin 

    Typically used as dimension lines. etc,

   - hatching, thread, short centerline, support line

2. Break Line

   A broken line is a line used when there is no need to mark the entire part of a product. For example, when a long object such as a pipe round bar is displayed on a drawing sheet, The line.
<Figure 1-2 Break Line>


Figure 1-2 is an example of a broken line.

3. Solid Line, Thick

   A line that represents the shape of the shape.
<Figure 1-3 Bold solid line>




Figure 1-3 shows the outline of the shape in bold solid lines. You can set the thickness of layer line on CAD and output it. If the difference between the thin solid line (dimension line) and the thick solid line (outer line) is given, the difference between the outer shape and the dimension becomes clear and the drawing becomes clearer.

4. Dashed line 

It is also used for displaying hidden parts and projecting invisible parts.
<Figure 1-4 Hidden line>

As shown in Figure 1-4, the treatment of invisible areas is done with a dashed line.

5. Thick hidden line (Dashed line) 

  This is the line used to describe the surface treatment. For example, it means heat treatment or the like.

6. Dot-Dashed line 
  
 Used for marking circle, hole, center of symmetry plane.
  
<Figure 1-5 Center line example>

7. Dot-long dash line

It is used for marking when surface treatment is necessary.

8. Dot-long dash line 

 The dotted line is used to mark the virtual line.


It was a curious story.