Recent developments in the modeling of machine tools

It is a permanent task to increase the accuracy of machine tools. In this paper three fields of activity are presented and results are discussed. With regard to the mechanical machining the dynamic behavior of parallel kinematic machine tools is investigated. The active manipulation of the dynamic behavior of machines by using kinematic redundancies is discussed. According to the importance of the thermal behavior in terms of accuracy an estimation procedure on the base of nonlinear regression is presented. With this method the thermal displacements are calculated using measured temperature data. This information represents the basis for compensation strategies. Especially during a dry-machining process the clogging of hot chips influence the thermal behavior of machine tools. Hence it is of particular interest to eliminate the chips quickly and completely out of the workspace. One way to achieve this is to apply air streams. Some experimental and numerical results are examined