Quality of machine tool structure is defined by it static and dynamic compliance. The effect of static stiffness at part shape and machine productivity is one of the reasons that structure static stiffness is used as a main criterion in machine design. The machine dynamic stiffness or compliance directly effect roundness (for example, profile of cross section in turning), surface finish, and indirectly tool life and life of machine components. These effects are defined by structure resistance to transmit vibration in cutting zone or other points of interest in machine tool structure. Dynamic compliance defines accuracy of machining, because it stipulates how machine response to any exciting force, occurring inside and outside machine structure. Dynamic compliance limits the productivity of cutting because it defines maximum depth of cut that may be achieved at a machine in particular set up. The goal of dynamic analysis is to find parameters of the structure that have dominant effect at it dynamic compliance and improve structure based at this information. Usually dynamic analyses required more complicated methodological approach because of coupling between different modes of vibration. The methodology of dynamic analysis of machine tool is illustrated by analysis of mobile spindle module and turning center. The obtained theoretical results are compared with actual testing data.

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