NC - Mastercam Numerical Control File
This file type is created with Mastercam which is a suite of CAD programs used to design and manufacture components. It can contain numerical control instructions to direct machine tools such as drills and lathes. These files specify either 2D or 3D tool paths for machines as well as their coordinates as a part of the production proces. They also assist in translating tool paths into formats that programmable machine tools understand.