what does the cbn mean in grinding wheels
Cubic boron nitride (CBN) Grinding wheels with diamond or CBN grains are called superabrasives. Grinding wheels with aluminum oxide (corundum), silicon carbide, or ceramic grains are called conventional abrasives. Grain size. From 10 (coarsest) to 600 (finest), determines the average physical size of the abrasive grains in the wheel.