People have been working metal for so long that the list ... 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 ...

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits ... be industrial-grade tools. “Twist drills remove all the metal from the inside ...

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 drill bit without reacting with the brass.

High-speed steel (HSS) is found in most standard twist drills used for wood, metal, and plastic ... nitride coated (TiN) drill bits are also popular. HSS is hard-wearing, but other materials ...