The average do-it-yourselfer hates to drill metal, especially steel. We don’t know how many questions readers have submitted and we’ve answered on that topic over the years. Even the most enthusiastic ...

It’s become a common sight in manufacturing. An employee, needing to tap a hole in a metal part, reaches for a standard hand drill instead of the tool designed specifically for the job—a tapper.

I quickly calculate proper tap-drill diameters using this simple formula. Tap-drill diameter equals nominal diameter minus thread pitch. I quickly calculate proper tap-drill diameters using this ...