This paper discusses through hole drilling of soda-lime glass plate using an electroplated diamond tool to determine appropriate drilling conditions, grain size, and tool geometries for smaller cracks and higher processing efficiency. The machining times of helical drilling were short in comparison with step drilling, because the drilling method has a rapid feed speed. In addition, the tool with a space for chip removal is effective for chip removal and crack control. The crack sizes at the entrance and exit are smallest under a spindle revolution of 20000 min
-1, feed speed (tangential direction) of 20 mm/min, helical pitch of 0.3 mm, and mesh size of #600. The crack size at the exit is small in the case of reciprocating drilling.
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