Wednesday, August 4, 2010

orthographic drawing

Let us learn about orthographic drawing

A projection on a plane, using lines perpendicular to the plane

Graphic communications has many forms. Orthographics is one such form. It was developed as a way of communicating information about physical objects. It is part of a universal system of drawings. House plans - one well known drawing format, are a form of othographic projection. In simple terms, orthographic drawings are views (front, side, top, and so on) of an object. An orthographic view is only one side. It takes several views to show all the object. Before getting to views, it is useful to look at another type of drawing. Pictorial drawings show several sides at the same time. Many people find pictorial drawings easier to understand. They do not provide as much information as orthographic views. The most commonly used pictorial drawing for technical information is called isometric drawings. Isometric drawings were developed to approximate perspective, but are much easier to draw. For a square box, all the sides are drawn as vertical lines, or at 30 degrees to the horizontal.

Match the orthographic drawing to the isometric drawing.

A ) Figure 4
B ) Figure 2
C ) Figure 3
D ) Figure 1

Steps to derive

1 An orthographic drawing shows the top view, front view and right-side view of a three-dimensional figure.
2 Develop a three-dimensional figure from the orthographic views.
3 Top view forms the base of the structure. A three-dimensional structure is developed from the orthographic views.
4 Figure 2 gives the isometric drawing of the structure developed from orthographic drawing.

Hence the right answer is Option B

In our next blog we shall learn about "alphabet of lines"

I hope the above explanation was useful.Keep reading and leave your comments.

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