A long time ago, in an issue far, far away…the May 2014 issue of KITPLANES, to be exact…The Home Shop Machinist covered the ins and outs of using the Quantum jig to DIY drill bolt heads for safety ...

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 ...

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 ...