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There have been few reports dealing with the drilling in Printed Wiring Boards (PWBs) with micro-drills, smaller than 0.2 mmin diameterand, super-high-speed spindles, higher than 160,000rpm. In these cases, problems that it is impossible to prevent the breakage of the micro-drill and keep the position accuracy of the drilled hole have occurred. We therefore focus on the step-drilling method with high speed and short stroke as a novel technique to resolve these problems. On the other hand, there is a problem to determine the complicate combination of feed speed, rapid feed speed and stroke length in this method. Thus, we attempt to apply the response surface method to optimize these parameters. As a result, a proposed method is found to be effective to improve the drilled hole quality and drilling efficiencyin such kinds of micro-drilling in the PWBs.

Optimization of Step Micro Drilling Motion with High Speed and Short Stroke in Printed Wiring Boards by Response Surface Method