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Due to the application in practice and in the process of training students in engineering specialties, it is very important to analyze the possibilities of profiling real involute curves of spure gears. The report presents specific ones opportunities to build a real involute curves of a spure gear through one of the most used CAD systems. The results of the application of the AutoCAD .NET API developed by the authors for the simulation of the profile of cylindrical spur gears with external teeth are presented. The report is presented a comparative analysis between involute profiles built from existing CAD systems and profiles built through the developed application by the authors. The results of the research identified many possibilities for using the developed application for the educational process of students and for use in real specific production of gears obtained through the technologies of direct cutting of the contours of the gears by laser, plasma and water jet cutting.