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.

Common materials of construction include high-speed steel, cobalt, carbide ... GOST 26474 - Diamond and Extra-Hard Composite Material Drill Bits and Core Bits. Types and Main Dimensions. BS ISO 9714-1 ...

Core bits have a hollow center, similar to hole saws, but differ in application. A hole saw is meant to create a large hole in a workpiece, while a core drill is designed to cut a hole and remove a ...

Steel Tooth Rotary Bits are the most common ... specific drilling challenges. Various drilling designs are also employed for different results, including core bits, which gather formation cores ...

When you are drilling out a stainless steel screw, heat is your worst enemy. Heat will build up quickly in the area where the drill bit contacts the stainless steel screw. The heat, if not left in ...

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 ...