It turns out that a hot solution of alum (ammonium aluminum sulfate), which is available in the spice rack of your local supermarket, will dissolve the steel ... for larger drill bits, but the ...

And heat dulls bits quickly. In general, it’s a good idea to drill through metal using as slow a speed as possible using a ...

the extra control afforded by the design of these bits was especially helpful. It takes a tough bit to drill through hard ...

The mild steel of the hammer makes it hard to keep an edge, so [Jody] pulled out his TIG welder and laid down a bead on the cutting edge using an old drill bit as a fill rod. The video below shows ...