Abstract
CNC Machine Tools with kinematical feed chains with great distance between slides (gantry milling machines, cutting machines, carousel lathes etc.) are utilized extensively for machining large and heavy parts. In this type of machine, we can observe a specific phenomenon where the gravity center of the vertical actuated elements moves in the direction of the balancing force for the mobile elements, causing a bending moment to be induced in the mobile element (the mechanical coupling between the two kinematical feed chains). This effect leads to deformations and in worse case looking of the mobile element during movement, all of this has a detrimental effect on machining accuracy and efficiency. In this paper, using finite element analysis (FEA) several studies where preformed. A static analysis that calculates the stresses, displacements and strains. A modal analysis to determine the first six natural frequencies and modal deformed shapes. A harmonic response analysis to determine the response of the mobile element structure. This studies will highlight the week points of mobile element and will provide the machine tool builder with important information regarding the points that need to be address in order to improve the behavior of the mobile element during actuation.
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