Alexandre,
My brother was running a large chop saw used to cut structural steel tubing and bar stock. It had a 20 inch abrasive blade and a long handle so you would stand about 4 feet from the blade when it was cutting. Even though it was water cooled it still sent a huge shower of sparks everywhere.
One day the blade shattered and a piece caught him inside the thigh right below the groin. His blood was pumping out of him like a water spigot. Good thing the Seattle Fire Dept was right next door and the hospital only a few minutes away. From that point forward, air cylinders were used for all material clamping and the chop saw was raised and lowered with air cylinders as well. No one can stand in the path of the blade.
