The Alphabet of lines is nothing but the different types of lines. The use of line types on a drawing is used to describe the various features of an object to the person reading the print. Lines help to illustrate and describe the shape of objects that will later become real parts.
Introduction to Alphabet of lines
In order to understand what the line is trying get across, you must be able to understand the symbols.
The standard thickness of the line is 0.030 to 0.038 inches.
The standard thin line weight varies from 0.015 to 0.022 inches.
Main Types of Lines
There are 13 types in lines. They are,
1) Visible Lines: The visible lines should be dark heavy and dark lines. It shows the outline and shape of the object. It defines you can see in particular view.
2) Hidden lines: The hidden lines should be light, narrow, short and dashed lines. It shows the outline of a feature that cannot see in particular view. It used to help Clarify feature.
3) Section lines: Thin line usually drawn at 45 degrees angle and it indicates the material that has been cut through in sectional view.
4) Center Lines: The center lines are nothing but thin line consisting of long and short distances. It shows the center of holes, slots, paths of rotation and symmetrical objects.
5) Dimension lines: In alphabet of lines the dimension lines is nothing but lines dark and heavy lines. It shows the length , width , and height of the features of an object. It terminated with arrow heads.
6) Extension lines: In alphabet of lines extension lines used to show the starting and stopping points of a dimension and it must have at least a 1/16 space between the object and the extension line.
7) Leader lines: In alphabet of lines leader lines should be thin lines and used to show the dimension or a note that is too large to be placed beside the feature .
8) Cutting plane lines: In alphabet of lines cutting plane lines is thick broken line that is terminated with short 90 degree arrow heads.
9) Break lines: In alphabet of lines break lines is used to break out sections for clarity or for shortening a part.
10) Short break lines: In alphabet of lines short break lines are thick wavy line and it used to break the edge or surface of a part for clarity of a hidden surface.
11) Long Break Lines: In alphabet of lines long break lines should be long and thin lines and also it used to show that the middle section of an object has been removed so it can be drawn on a smaller line.
12) Cylindrical Break lines: In alphabet of lines Cylindrical Break lines are thin lines and it used to show round parts that are broken in half to better clarify the print or to reduce the length of the object.
13) Phantom Lines: In alphabet of lines the phantom lines are thin lines made up of long dashes alternating with pairs of short dashes and to show the alternate position of moving parts.
Key points of Alphabet of Lines
* Identify the alphabet of lines
* Identify where the line types are used
* Produce the lines with various line weights.
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