CNC control of machine tools made it possible to cut a variety of complex three-dimensional shapes that were previously difficult or impossible to create. That was then. This is now. Though CNC still is the main controller of choice for machining centers, other options such as PLCs, PACs and PC-based controls are drilling into the CNC's dominance.
Some proprietary control architectures are utilizing dual kernel platforms to integrate PC functions in a Windows environment, which some developers prefer because it's easier to use and program.
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From
'Machine Builder Forum: Heard On Discrete'