Analytical modelling of the eVects of manufacturing errors on the accuracy for a TRR±XY hybrid parallel link machine tool

Using a parallel link mechanism as the basic structure of the parallel link machine tool is a new design concept and has become one of the most important research ®elds and attracts many previous researchers. However, the application of these machines as a machine tool has not proven itself in terms of accuracy enhancement over traditional machine tools. In general, the geometry of the machine tool (moving platform size relative to base size) has signi®cant eVects on the level of accuracy achievable. Therefore, an error model analysis for the parallel link machine tool to take advantage of the geometry to minimize the error and to increase the accuracy is very important and interesting and is focused on in this research. A TRR±XY hybrid ®ve-degree-of-freedom parallel link machine tool is built for this research to investigate the error model theory. The errors from the component machining and assembly are de®ned and considered in the inverse kinematic solution. The eVects of the manufacturing errors on the accuracy of the machine tool are shown in this research.