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An engineering drawing is a technical drawing that shows the requirements needed to manufacture a product or part. They are also known as mechanical drawings, manufacturing blueprints, or drawings.
Engineering drawings use standardized language and symbols to communicate ideas and information. They can include information about: Shape, Structure, Dimensions, Tolerances, Accuracy, Other requirements.
Engineering drawings can be divided into four main categories: General arrangement drawings Detail drawings Assembly drawings Auxiliary views
One common use of engineering drawings is to specify the geometry necessary for the construction of a component. A number of drawings are usually necessary to completely specify even a simple component.
Two methods used to represent three-dimensional objects in engineering drawings are isometric projection and orthographic projection:
Isometric projection: An axonometric projection where the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees. Isometric grids are a convenient aid in sketching isometric drawings with both straight edges and circular features.
Orthographic projection: A way of representing a 3D object by using several 2D views of the object. Orthographic drawings are also known as multiviews.
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