Printed board drilling method and printed board machining apparatus

摘要

There are provided a printed board drilling method and a printed board machining apparatus that are capable of improving machining quality, e.g., positional accuracy of holes and true roundness of machined holes, and work efficiency by minimizing a runout of the tip of a drill. An extension of the drill (3) extending out a spindle (6) when the drill (3) is held by the spindle (6) is defined in advance per type or mode of use of each drill (3). One drill (3) is selected among a plurality of drills corresponding to a shape of holes to be drilled in the printed board and the spindle (6) is caused to hold the drill (3) so that the selected drill (3) extends out of the spindle (6) by the extension corresponding to the selected drill (3). Then, the move of the spindle (6) with respect to the printed board is controlled and the selected drill (3) is rotated and driven by the spindle (6) to drill the printed board.