The aim of this paper is to design a complete technological process of 3D model based on manufacturing sheet for machining on CNC milling machine, achieve predetermined quality of the manufactured part and optimize time of performing individual operations. Catia, one of the leading integrated CAD/CAM/CAE programs in the world, as well as CAD/CAM programming, is briefly described in the introduction. Second part of the paper concerns designing of the technological process and optimizing certain operations with goal of achieving shorter total manufacture time. Tools and machining parameters for individual operations were selected from the listed catalogues. Tool trajectory in each operation is depicted in detail by simulation, as well as accuracy of shape and size validated by analysis. Last part of the paper contains the analysis of the finished manufactured part after both clamping. It shows accuracy of size and shape produced by machining. Also, problems which arose during manufacture were explained, as well as potential improvements.