| 摘要 |
PROBLEM TO BE SOLVED: To form an oblique hole in a workpiece without tilting the workpiece in an electrical discharge machining method for applying voltage across an electrode and the workpiece to form a recessed part in the surface of the workpiece by spark. SOLUTION: In moving the electrode 1 in the vertical direction to form a hole in the workpiece 7, a movable table 31 is moved within a horizontal plane by the amount proportional to the vertical travel of the electrode 1, so that the relative movement of the electrode 1 to the workpiece 7 placed on the movable table 31 has an angle of inclination to the vertical direction. The electrode 1 is turned to the angle of inclination so that the hole is formed in the direction of angle of inclination, that is, in the oblique direction so as to dispense with the work for previously tilting the workpiece.
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