Lesson23-Alphabets of Lines

*Drafting-is a language of lines & symbols.
Classifications of Lines according to Use:
1. Borderlines-it surrounds a drawing.
2. Visible or Object Lines-it represents the visible edges of an object.
3. Hidden Lines-it represents the hidden features of an object.
4. Center Line-it represents the axis or center of objects with symmetrical shapes.
5. Dimension Lines-it is used to indicate the measurement of an object.
6. Extension Lines-it shows the extent or limit of the measurement.
7. Projection Lines-it projects 1 view to another.And sometimes called extension lines.
8. Leader Line-it indicates the measurement & name of a part.
9. Reference Line-it is used to label the parts of an object.
10. Limiting Line or Long Break Line-it is used to break objects that are very big to be drawn on paper.