Engineering Drawing is a graphical language of engineers, used to communicate the ideas from one mind to another.
From ancient days, human have
used pictures to express ideas. In the old days, different people and cultures
used different types of pictures to communicate ideas. There were no common rules
to be followed while drawing the pictures. This was he problem that faced by
engineers and architectures.
Gaspard Monge a French
Military Engineer have also faced the same problem. He formulated the rules of
drawing that could be used to communicate an object to anyone across the world.
He devolved a system called Orthographic Projection.
Now a days, commonly used drawing methods are;
Perspective drawing
Descriptive Geometry
Orthographic Drawing
Drafting and Computer Aided
Drawing
Perspective Drawing
Perspective in the graphic arts is an
approximate representation of an image, on a flat surface. Perspective
projection is used to draw the three dimensional picture of an object as it
appears to the human eye. Perspective is one of the foundations of realism in
art. Perspective drawing is mainly used in Architecture. By means of
perspective drawing, the architect is able to show how an object would appear
when constructed.
Descriptive Geometry
Descriptive geometry is
the branch of geometry in which three-dimensional objects are represented in
two dimensions, by using a specific set of procedures.
Gaspard Monge have developed this
technique . Descriptive geometry uses the image-creating
technique of imaginary, parallel projectors emanating from an imaginary object
and intersecting an imaginary plane of projection at right angles. The
cumulative points of intersections create the desired image.
Orthographic Drawing
It is a technique of
representing three dimensional objects in two dimensions. It is a form of
parallel projection and all the projection lines are perpendicular to plane of
projection, resulting in every plane of the scene appearing in affine
transformation on the viewing surface.
Drafting
It is a graphical representation of
structures, machines, and their component parts that communicates the engineering
intent of a technical design to the craftsman or
worker who makes the product.
Computer Aided Drawing (CAD)
CAD is the use of computer systems to
aid in the creation, modification analysis or optimization of design.
