Contrary to Copper Wheel engraving, this technique is relatively new. In essence, a drill similar to a dentists’ drill, equipped with a diamond burr, is used to cut into the surface of the glass. Since there is a wide variety of burrs available, work ranging from extremely fine, delicate work, to large-scale cutting, can be achieved. The cut glass surface can be softened and polished using either rubber or silicone rubber wheels with fine diamond dust incorporated, or by using softer abrasives such as cerium or zirconium oxides. I mostly use rotary high-speed engraving because it is ideal for delicate artwork, and for lettering.
This tool is also excellent for wood carving, as shown in the partially carved outline on the gunstock below.