An engineering drawing is a type of drawing that is technical in nature, used to fully and clearly define requirements for engineered items, and is usually created in accordance with standardized conventions for layout, nomenclature, interpretation, appearance (such as typefaces and line styles), size, etc.
Its purpose is to accurately and unambiguously capture all the geometric features of a product or a component. The end goal of an engineering drawing is to convey all the required information that will allow a manufacturer to produce that component, in particular.
Old and new
Engineering drawings are often referred to as "blueprints" or "bluelines". However, the terms are rapidly becoming an anachronism, since most copies of engineering drawings that were formerly made using a chemical-printing process that yielded graphics on blue-colored paper or, alternatively, of blue-lines on white paper, have been superseded by more modern reproduction processes that yield black or multicolour lines on white paper.
The process of producing engineering drawings, and the skill of producing them, is often referred to as technical drawing.
Common features of engineering drawings
Drawings convey the following critical information: Geometry; how the object will look when it is viewed from various standard directions, such as front, top, side, etc.,Dimensions;, Tolerances;, Materialand Finish.
Line styles and types
A variety of line styles graphically represent physical objects. Types of lines include the following: visible, hidden, center etc.
Lines may also be classified by a letter classification in which each line is given a letter.
Multiple views and projections
In most cases, a single view is not sufficient to show all necessary features, and therefore, several views are used.
Types of views
Types of views generally includes the following:
- Orthographic projection.
- First angle projection.
- Third angle projection etc.
The metric drawing sizes correspond to international paper sizes.
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