| 摘要 |
PROBLEM TO BE SOLVED: To provide a work machining method in which the maintenance and examination are easy, and the accuracy of the hole depth is excellent even when conductive chips are adhered to the vicinity of a tip of a tool. SOLUTION: A printed circuit board 31 is fixed to a table 30 so that a copper foil 31c faces a drill 14, and an insulating layer 31i faces the table 30. An insulating plate 50 is placed on the upper side of the copper foil 31c. Chips 60 adhered to the vicinity of the tip of the drill 14 are removed by the insulating plate 50 during the machining. Thus, the tip of the drill 14 is brought into contact with the copper foil 31c.
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