Hole formation in electron beam drilling of metals is mainly due to molten metal removal. In this process, there are two different removals : ejection outside the target and remaining around the hole on the target surface. In the present paper, measurement of these removals is carried out. Size of molten metal particle ejected from the target was obtained. The particles have the most probable value in their diameters determined for each metal and each pulse duration. The solidified metal volume

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... remaining around the hole was also obtained. From these results, the remaining ratio of ejected molten metal from the target is determined. The major part of the molten metal remains around the hole for mild steel and ejected outside the target for aluminum.