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 ... you may be good, but [Jody] is better, and ...

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and ... there’s a good chance it’s going to kick back and give you ...

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.

you can sharpen drill bits without a heavy-duty tool — all that's really needed to do a reasonably good job is a diamond file. And if you're cutting into carbide or hard high-speed steel (HSS ...