There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and annular cutters. 1. Twist drill bits. Especially in steel thicker than ...

People have been working metal for so long that the list of tips and tricks ... 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 ...

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.

They include over-sharpening, overheating the metal, and positioning it incorrectly ... However, it is possible to resharpen and salvage those drill bits, as so long as you avoid these sharpening ...