Abstract
This paper deals with a machining device for a local area on a large workpiece called Local Machining Station (LMS). It consists of a small machine tool, a reference plane with displacement sensors, extendable legs and adhesion pads. By adhering on a workpiece with the pads and pressing the LMS with a robot, the stiffness of the system is improved. Because the movement range of the mobile machine tool is restricted within the reference plane, higher positioning accuracy can be easily obtained by the LMS method. A prototype with five degrees of freedom is a mechanism which consists of a parallel mechanism and an xy stage. A small electrode feeding device for electrical discharge machining (EDM) on the xy stage is installed as a mobile small machine tool in the prototype. The tool electrode is positioned in a local coordinate system for a worlpiece by using holes which have been machined as references. Some holes are machined by EDM on the workpiece. The accuracy of measured interval between two holes and the center of the machined holes with the LMS are better than that with a robot.
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