Abstract
This study deals with the internal damage around the drilled holes connecting the circuits in printed wiring boards made of GFRP (plain woven cloth, glass/epoxy-resin). The influencing factors were determined by measuring the thrust forces (the feed direction components of cutting force) and evaluating the relative position between the drill tool center and the yarn of the woven cloth. It is found that there are two important factors of the internal damage widths around the drilled hole; the relative angles between the cutting directions and the fiber directions, and the fiber bundle thickness of glass cloth on the drilled hole wall. As a result, it is indicated that the reduction of fiber bundle thickness of the glass cloth is effective to prevent the internal damage around the drilled hole.
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