MMD2D501-2D DRAWINGS CONCEPTION
Introduction
In 1935 the American Standard Association issued the first American standards, entitled
“Drawing and Drafting Room Practice”
These standard advocated conventions in many ways, e.g. partial views, half views, symbols,
lettering, lines, hatching lines, etc. These have been adopted as a standard convention by the
Bureau of Indian Standards also.
Conventions make the drawing simple and easy to draw. But it is difficult for untrained eyes
to understand it easily. Drafting time should be reduced to cut drafting cost. Time must be
saved in drafting. It will take a lot of time to draw the actual shape, hence, some conventions
are standardized and used in the drawing to save the time.