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>High-speed is best with tungsten carbide drills. My drill only does
>
> I find I get the best results doing a quick jab, using a high speed carbide bit with a drill stand I built out of a little precision slide it works great. Take a moment to line it up carefully and then plunge, a carbide bit turning around 20KRPM plunges through the FR4 board like a hot knife through butter.