The paper presents the stages of CAE, which is composed by CAD-FEM for determining optimal construction and loads for a modular fixture device for prismatic and circular work-pieces. Such devices are used for processing on CNC performance machine tools, like machining centres including 5-axis CNC milling machines. It is presented the methodology of analysis and results of its application. Are established numerical analyses ways, in the conditions defined by the loadings and identified the most solicited area of the device structure. It is recommended in that the area be placed a strain sensor. This is an important step needed transformation into a mechatronic device.
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