We also sell this as a sign but, given the right piece of slate, the effect makes a spectacular award. We buy these roof slates from a Vermont quarry and generally have them on hand. Sand carving from the back adds depth and sparkle to the graphic and text while also keeping them clean and dust free. The photo is of the 8 x 10 size.
The answer here could be a long article but in general, a rotary engraving machine is driven by compressed air which pushes a diamond or carbide tip into…