| 摘要 |
A machining liquid 5 is supplied to a machining zone between a machining electrode 4 and a workpiece 2 in a direction effective to remove material particles to be accumulated around the machining zone. When the liquid pressure drops below a predetermined level due to a breakthrough in the bottom of the workpiece, machining liquid is supplied in a direction up through the breakthrough hole to compensate for a reduction of particle removing effect due to the pressure drop.
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