| 摘要 |
When the surface roughness of a work face of the workpiece (2) fixed onto the surface plate table (8) in the work tank (14) in which the work fluid (17) is stored is more than a predetermined value, the bladder (15) capable of expanding or contracting by the pressure of fluid accommodated in the bladder (15) is contracted, and a space between the work tank (14) and the surface plate table (8) is filled with the work fluid (17), and electric discharge work is conducted. When the surface roughness of a work face of the workpiece (2) is not more than a predetermined value, the bladder (15) is expanded, and a quantity of the work fluid (17) getting into between the work tank (14) and the surface plate table (8) is reduced and electric discharge work is conducted.
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