The paper discusses the design methodology of the technological processes of mechanical processing, taking into account the fact that these processes are determined by the interaction in tolerances of four distinct systems such as the part, the blank, the technological process and the technological system, each of which has its own dimensional structure. Formally, geometrically, the optimality of the technological process is determined by the similarity of the graphs of the technological and constructive dimensional relations. The dimensional structures with the fewest elements in the dimensional chains are optimal because each of these elements causes an increase in the tolerance of machining allowances removed in the next technological phase and affects the technological assurance of the process.

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