From Engineering Drawings to CAD
The traditional drafting process has always been done on a large table with a T-square, protractor, curve-tracing template, and a fine, hard pencil. The result is the pride of the craft, large rolls of paper covered with precise plans, sketches and musings of architects or engineers turned into measurements, tolerances, angles all worked out in detail.
Computer Aided Design entered the picture in the 1970s. The capability of using a computer to make technical drawing for design greatly speeds up the process of drafting. CAD drawings are completely modifiable, easily incorporating changes. They are also easily transmitted, exchanged, shared, and copied.
The reason why CAD drawings are so completely flexible is that the angles and line lengths drawn so carefully with straight edge and protractor are replaced in the CAD drawings with lists of flexible node point locations and mathematical formulas for the lines connecting them. That means that plans can be quickly altered by moving the node points and thereby changing the set of formulas around them.Read More