Abstract: 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.

Abstract: 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 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.

Abstract: In a machining method and a machining apparatus, prior to machining, an NC control unit makes an X-axis drive unit move a table based on examination conditions specified in advance. Thus, the NC control unit obtains a stabilization time required from the command-reach time of a poisoning command and till the stabilization of position response of the table within a predetermined allowable range. Likewise, for moving a drill in a Y-axis direction, the NC control unit obtains a stabilization time required till the stabilization of position response within a predetermined allowable range. At the time of machining, the drill is moved in a Z-axis direction to cut into a printed wiring board as soon as the obtained stabilization time has passed.

Abstract: The invention provides a machining method and a machining apparatus in which the machining productivity and the machining quality of the machining apparatus can be improved. Prior to machining, an NC control unit makes an X-axis drive unit move a table based on examination conditions specified in advance. Thus, the NC control unit obtains a stabilization time required from the command-reach time of a poisoning command and till the stabilization of position response of the table within a predetermined allowable range. Likewise, for means for moving a drill in a Y-axis direction, the NC control unit obtains a stabilization time required till the stabilization of position response within a predetermined allowable range. At the time of machining, the drill is moved in a Z-axis direction to cut into a printed wiring board as soon as the obtained stabilization time has passed.

Abstract: Ratios between a distance between an upper wire guide and the upper surface of a workpiece to be machined, a thickness of the workpiece and a distance between a lower wire guide and the lower surface of the workpiece are given to the inlet and outlet positions of a wire electrode at the upper and lower surfaces of the workpiece which have been interpolated so as to directly obtain displacement positions of the upper and lower wire guides, along which the upper and lower wire guides are moved successively, thereby obtaining an articles which is accurately machined with a relatively simple machining procedure.