![]() The third source of CAD development resulted from efforts to facilitate the flow from the design process to the manufacturing process using numerical control (NC) technologies, which enjoyed widespread use in many applications by the mid-1960s. The use of computer modeling to test products was pioneered by high-tech industries like aerospace and semiconductors. The second source of CAD was in the testing of designs by simulation. One of the important time-saving advantages of computer modeling over traditional drafting methods is that the former can be quickly corrected or manipulated by changing a model's parameters. These developments were pioneered by the General Motors Research Laboratories in the early 1960s. The first source of CAD resulted from attempts to automate the drafting process. ![]() CAD had its origins in three separate sources, which also serve to highlight the basic operations that CAD systems provide.
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