ALUMINUM, CAST IRON, MILD STEEL, STAINLESS STEEL CUT MATERIAL. BI-METAL BLADE MATERIAL. 2-9/16 INCH DIAMETER. 200 RPM (ALUMINUM), 85 RPM (CAST IRON), 65 RPM (STAINLESS STEEL), 130 RPM (MILD STEEL) ...

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.

Twist drill bits. Especially in steel thicker than ¼", twist drill bits ... carbide-tipped hole saws can drill through metal that is up to 5/8" thick. Though it’s possible to use a hole saw ...

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

metal, and plastic, whereas cobalt is typically used for harder materials like cast iron or stainless steel. Tungsten-carbide ...