Manual & Computer Aided Drafting
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The image of the dedicated drafting professional working over a large drawing board with a mechanical pencil, straight edge and various sizes of plastic triangles is quickly fading from the American workplace. Today's drafters are likely to be sitting in a well-lit office in front of a computer terminal using not a pencil, but a computer mouse to construct a drawing. With a click of the mouse, drawings can be shown in three dimensions, rotated, animated, and viewed from many different angles. Through such modeling, designers and engineers are able to spot problems which could not be readily seen in two dimensions. Although computer aided drafting (CAD) has many advantageous over manual drafting, there are still some environments in which manual drafting continues to be used. This research examines manual and computer aided drafting, and considers the advantages and disadvantages of both as well as the factors which have led to the increased acceptance of CAD.When multiple views are required, multiple blueprint sheets are produced. In this way, contractors can easily create and identify the requirements for different trades (electrical and plumbing, for example), or electrical schematics can be shown in different levels of detail. Drafting was typically performed either by engineers and architects directly, or by professional drafters, often with formal training in drawing, who worked from information provided them by archi
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rograms, such as AutoCAD, have gained such market presence that third-party vendors have produced extensive symbol and block libraries. These libraries are available for specific industries (electronics and construction, for example), and enhance the productivity of the computer drafting program by eliminating the need to create these items from scratch. In addition, companies have also written utilities which can be used in conjunction with the computer drafting programs to place symbols, rotate symbols, and offer other custom features to the products.
Advantages of Manual Drafting
One of the main advantages of manual drafting is that there is no special equipment required to complete the task. There are drafters' tools, such as compasses, straight edges, drafting boards and other devices, but the workstation for a drafter using manual techniques is not considered a major capital expense. The same cannot be said for CAD, which requires investing in hardware, software and peripherals which may cost upwards of $10,000 just for the initial station. Over the years, the cost of maintaining the workstation will increase as software updates are issued, computers become faster, and more sophisticated printers reach the market.
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Approximate Word count = 2588
Approximate Pages = 10 (250 words per page)
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