To that end, this beginner lesson in heat-treating steel from [Blondihacks] demonstrates why it can be beneficial to trade some of the metal’s toughness for improved hardness and just how to ...

hard steel, and even titanium. Because cobalt alloy bits are more expensive than conventional metal drill bits, they aren’t ...

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 ...

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and ... hole saws can drill through metal that is up to 5/8" thick.

If wood splits or is hard to drill ... when drilling into metal—or refuses to bore a hole—you might be using the wrong type of drill bit. "For steel, use cobalt-alloy bits since they're ...