Computer Aided Drafting

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 architects and engineers. Different levels or views of the same object were shown on different sheets, and the final drawings were produced on blueprint machines. The process was time-consuming and fragile; even slight mistake

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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. Another advantage to manual drafting is that the training, once completed, does not have to be updated on a regular basis. Once a drafter learns
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