Certain features on a Engineering Drawing requires specific ways of indication. For example, holes require center lines to identify the center and show that it is round. Hidden detail are shown with a certain line type to avoid confusion with visible edges.
Most CAD Software packages will have these different line types predefined as layers. Depending on the layer chosen, the line will display it in a certain way. Often, most drafting companies will have their own custom layers with different colours, however the final product on paper will (or should) be as discussed below.
Line
Description
Continuous Thick Line
Continuous Thin Line
Continuous Thin Freehand Line
Continuous Thin Zigzag Line
Thick or Thin Dashed Line
Thin Chain Line
Thin Chain Line with Thick ends
Thick Chain Line
Thin Chain Double Dashed Line
Continuous Thick Line
The continuous thick line is used to show visible outlines or edges of a component or assembly. This line may be made thin if the drawing is congested and allot of lines are so close to each other that the clarity of the drawing is negatively influenced.
The continuous thin line is the most frequently used line type on Engineering Drawings. These lines are solid and has no break in them. Here is the list of cases where the continuous thin line will be used:
Imaginary lines of intersection
Dimension line
Projection lines
Leader lines
Hatching
Outlines of revolved sections
Short center lines (as opposed to the chain line)
Bending lines
Continuous Thin Freehand Line
Freehand lines shows breaks or cuts in parts or assemblies. The edge of the partial or interrupted view is indicated with a freehand line.
Continuous Thin Zigzag Line
The Continuous Thin Zigzag Line shows a break line. If a part needs to be shortened with a break for ease of visibility, a break can be made using this line. *Remember, any dimensions spanning over the break needs to have a dimension break indicated on the dimension line also.
The Dashed Line is used to indicate hidden details like hidden outlines and hidden edges. The dashed line may be either thick or thin, but only one type (thick or thin) should be used on a single drawing or set of drawings.
Thin Chain Line
The Thin Chain Line is used to indicate center lines, the lines of symmetry and also trajectories. Often this line is used as a point of reference on engineering drawings.
Thin Chain Line with Thick ends
Sectional cutting planes are indicated with a Thin Chain Line with Thick ends. This helps to identify the plane in which the part or assembly is cut. If the cut line is on more than one plane, the change in direction should also be indicated with thicker ends.
Thick Chain Line
A Thick Chain Line is used to indicate special requirements on a surface. This line does not form part of the geometry of the part, but is rather used to identify the surface
Thin Chain Double Dashed Line
The Thin Chain Double Dashed Line is used to show adjacent components. This is especially useful when the component has a reference to the existing components. It is also used to show alternative or extreme positions. On drawings where bends are indicated, these lines are used to show the initial outlines before forming or bending. One can also use this line to indicate parts or components situated in front of the cutting plane, to give reference to the part shown.
In Closing …
In Engineering Drawings, a line is not just a line. The different lines have meaning to them. The above mentioned line types are according to the requirements of ISO standards (and many other national standards).
There are three types of lines: Visible line: Indicates an edge is visible in relevant view. Hidden line: Indicates the edge is behind a face. Phantom line: Mostly used to indicate an alternate position of a moving part.
There are three types of lines: Visible line: Indicates an edge is visible in relevant view. Hidden line: Indicates the edge is behind a face. Phantom line: Mostly used to indicate an alternate position of a moving part.
5 Types of Line in Art, Their Meaning And When To Use Them
There are 5 main types of lines in art: vertical lines, horizontal lines, diagonal lines, zigzag lines, and curved lines. Other types of lines are simply variations of the five main ones.
The style and system of tolerance representation may differ based on standards used (like ISO or ANSI). What are the four types of engineering drawings? Four types of engineering drawings are assembly drawings, detail drawings, section drawings, and schematic drawings.
Common types of lines used in technical drawings include visible, hidden, center, dimension, extension, leader, cutting plane, section, phantom, and break lines. 2. Visible lines are thick and dark to identify visible edges.
Engineering drawing is a two-dimensional representation of a three-dimensional object. In other words, engineering drawing is the art of correctly representing a real or imaginary object on paper. In this process, we would use some graphics, symbols, letters, and numbers with the aid of engineering drawing instruments.
The diagonal lines on the section drawing are used to indicate the area that has been theoretically cut. These lines are called section lining or cross-hatching.
A hidden line, also known as a hidden object line is a medium weight line, made of short dashes about 1/8” long with 1/16”gaps, to show edges, surfaces and corners which cannot be seen. Sometimes they are used to make a drawing easier to understand.
Line art emphasizes form and drawings, of several (few) constant widths (as in technical illustrations), or of freely varying widths (as in brush work or engraving). Line art may tend towards realism (as in much of Gustave Doré's work), or it may be a caricature, cartoon, ideograph, or glyph.
Lines can be classified as either vertical, horizontal, diagonal, or curved. Vertical lines are straight lines that extend up or down. Horizontal lines are also straight lines to go from left or right or right to left, in the opposite directions from the vertical lines.
“Line” is a visual element that forms the basic foundation of all art forms. A line is the fundamental element in all drawings considered to be a moving dot and is used as a visual definition of shapes and plays a vital role in expressing emotion, form, texture, and motion.
Introduction: My name is Saturnina Altenwerth DVM, I am a witty, perfect, combative, beautiful, determined, fancy, determined person who loves writing and wants to share my knowledge and understanding with you.
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