| 摘要 |
There is provided a drilling method capable of improving machining accuracy of a printed board drilling apparatus as a whole by decreasing dispersion of the machining accuracy even if it is a multi-spindle printed board drilling apparatus. A misalignment of an axial center of a drill with respect to a designed axial center in X and Y directions is detected in advance per a certain number of revolutions of each spindle that rotates the drill. Holes of two or more types of diameter are made on a printed board by making holes of at least one diameter, e.g., an exposure master hole, per each spindle and by making holes of all other diameters almost simultaneously by all of the spindles.
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