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

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 ...

Are the materials in question soft or hard? Depending on the answer, you can choose the category of drill bit you ... High-speed steel is standard for most bits and can cut through most common ...

So it’s always a joy to pick up a new trick, especially one as simple as putting a hardened edge on mild steel using a drill bit as a filler rod. This tip comes to us by way of [Jody], aka ...