COMMONLY USED LINE TYPES:
1) Continuous line. 2) Hidden line.
3) Center line. 4) Phantom line.
TYPES OF LINES USED IN CAD
Visible lines:
Visible lines are the edges or outlines of the object. It is used to indicate hidden edges of the object. These lines stand out clearly with other lines. It is also known as continuous line and the weight is thick about 0.5-0.6mm.
REPRESENTATION:
Hidden lines:
This type of line is used to represent the portion or area of object that are hidden and cannot be seen or the overlap area of object that lie behind. It is represented by dashes and weight is thick about 0.35-0.45mm.
REPRESENTATION:
Center lines:
Center lines are used to indicate the centers of holes, arcs, and symmetrical objects. It is represented as long-short-long kinds of lines. Dimension lines are thin and are used to show the actual size of an object and weight is about 0.3mm.
REPRESENTATION:
Phantom lines:Phantom lines are long-short-short-long lines most often used to show the travel or movement of an object or a part in alternate positions. It can also be used to show adjacent objects or features. The line weight is thin about 0.3mm.
REPRESENTATION:
Dimension and extension lines:
Dimension and extension lines are used to show the size of an object. In general, a dimension line is placed between two extension lines and is terminated by arrowheads, which indicates the direction and extent of the dimension. The line type is continuous and the line weight is thin (0.3 mm).
REPRESENTATION:
Cutting plane lines:
cutting plane lines are drawn to differentiate what is inside an object and what lies outside it. The cutting plane line bisects the object and provides a view of its interior features. It is represented same as phantom lines with arrow that show the direction of sight. The line weight is very thick about 0.6-0.8mm.
REPRESENTATION:
OR
Section line is used to indicate the surface in the section view imagined to have been cut along the cutting plane line. They are grouped in parallel line patterns and usually drawn at a 45 degree angle. The line type is usually continuous and the line weight is thin about 0.3mm.
REPRESENTATION:
Break lines:
Break lines are used to show imaginary breaks in objects. A break line is usually made up of a series of connecting arcs. The line type is continuous and the line weight is usually thick (0.5 – 0.6 mm).Break lines are used when it is desirable to shorten the view of a long part.
REPRESENTATION:
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