| 摘要 |
PURPOSE: A long hole processing method for a printed circuit board is provided to drastically shorten the processing time of a long hole, thereby increasing productivity. CONSTITUTION: A method for processing a long hole on a printed circuit board(100) using a slot bit(300) mounted on a drilling machine with a CNC function comprises the following steps. A plurality of holes(200) is overlapped on the printed circuit board by lowering the rotation speed of the slot bit. A sharp remaining material(220) formed in the overlapped part is eliminated by processing the slot bit.
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