CUTTING BEARINGS OUT OF A 3 15/16 HEADPULLEY BEARING ON A TRACK FEEDER. AFTER REMOVING THE BEARING HOUSING HE CUT THE BEARING RACE ON 2 SIDES AND STRUCK IT WITH A HAMMER. AT THAT TIME A FRAGME NT OF HOT RACE DISLODGED AND STRUCK HIM IN THE UPPER CHEST/SHOULDER AREA.