Wire electrical discharge machine and method of controlling wire electrical discharge machine

A wire electrical discharge machine comprising:

• a machine main body for performing electrical discharge machining on a workpiece with a wire electrode in accordance with a machining program;
• a camera configured to take an image of the workpiece and fixed so as to move relative to the workpiece;
• and
• a control device configured to:
• control the machine main body so as to move the wire electrode to a wire feeding position on the workpiece defined by the machining program and feed the wire electrode;
• control the machine main body so as to perform electrical discharge machining on the workpiece with the wire electrode while moving the wire electrode along a machining path defined by the machining program;
• and
• obtain a position of a wire feeding hole that allows for insertion and feeding of the wire electrode, from the image of the workpiece taken by the camera, wherein:
• when the position of the wire feeding hole is deviated from the wire feeding position defined by the machining program, the control device is configured to:
• control the machine main body to move the wire electrode to the position of the wire feeding hole and feed the wire electrode there, and
• control the machine main body to perform electrical discharge machining on the workpiece with the wire electrode while moving the wire electrode on a path segment between a position where the wire electrode has been fed and the wire feeding position defined by the machining program, and wherein the control device is further configured to, before start of machining the workpiece, control the machine main body to move the camera relative to the workpiece along the machining path defined by the machining program to obtain the position of the wire feeding hole.