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The program for machine is important for creation a new parts in industry. In this time, the NC (numerical control) is very used. NC is technology, in which the program for controlling of the machine is used; for example for drilling, lathes, milling, conventional and unconventional cutting machines (laser, water-jet, plasma). CNC programming may use the application of Group Technology theory. Group Technology (GT) is a philosophy for manufacturing and strategy, which helps a company in understanding what it manufactures and how those products are then manufactured. When some properties are once identified, it is possible to capitalize on these similarities by processing together groups of families (similar parts). Then the opportunity for unnecessary duplication of effort for creation a new program and solving of some problems are minimized.