Here is how I think these handy little cutoff wheels "explode". While making some cuts in some 20ga stock I inadvertently allowed the side grinder to rapidly pull into the stock. The wheel still held together and remained balanced, but look at this big gouge that certainly could have led to an explosion.
[img]http://www.surfacezero.com/g503/data/3285/IMG_17093.JPG[/img]I always wear a full face shield when operating anything that spins.
