Aluminum is said to be resistant to the alum as well, but if your busted bit is buried in steel ... bits in brass – clockmakers. It remains to be seen how well it would work for larger drill ...

These are robust steel drill bits, good for drilling into wood, plastic or metal. One downside: At high drill speeds, they can overheat and soften, becoming dull. This is especially common when ...

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 ...