What is a nc file and how do I open a nc file?
An NC file is created by Mastercam, which includes a suite of CAD programs used for designing and manufacturing components. NC contains numerical control instructions for directing a machine tool, such as a drill, during production. NC files specify 2D or 3D machine toolpaths and their coordinates. They also help to translate toolpaths into a format that machine tools can understand.
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How to open nc file on Wikipedia
How to open nc file on Microsoft.com