Types of Knife Blade Grinds
Flat Grind: The flat grind consists of a straight tapering of the blade, on both sides, from the spine of the blade down to the cutting edge. The flat grind is sometimes referred to as a "V" grind. The flat grind offers low cutting drag, while maintaining more strength to the blade than a hollow grind.
Taper Grind: The taper grind consists of a straight tapering of the blade, similar to the flat grind, except the taper is started some distance below the spine, rather than at the spine. The taper grind offers more strength to the blade than the flat grind, but also adds cutting drag.
Hollow Grind: The hollow grind consists of a concave taper, on both sides of the blade, toward the edge. The hollow grind creates a thin edge, which produces the least amount of cutting drag. For this reason, the hollow grind is the most popular blade grind used.
Convex Grind: The convex grind consists of a convex taper, on both sides of the blade, toward the edge. It is the opposite of a hollow grind. It is the most difficult blade grind to manufacture. The convex grind is the strongest of all the blade grinds. For this reason, it is becoming a very popular blade grind. (See How to Sharpen a Convex Blade)
Chisel Grind: The chisel grind consists of a straight tapering of the blade, on one side only. This creates an edge that is slightly stronger than a taper grind edge. For this reason, it is often used on tactical blades. The chisel grind is one of the easiest grinds to sharpen.
Scandinavian Grind (Not Shown): The scandinavian grind is similar to the chisel grind, but the bevel is taller and may reach from halfway up the blade to as far as almost to the top edge of the blade. It is an easy grind to sharpen because the bevel can be laid flat on the grinding surface and ground in a circular motion.