EE WAS REPAIRING GEARBOX AT K-1 DRYER. EE WAS HOLDING A PIECE OF PIPE WHICH WAS BEING USED AS ASPACER FOR TRYING TO DRIVE A DISC ON A SHAFT. ANOTHER EE WAS HITTING THE END OF THE PIPE WITH A S LEDGE HAMMER. A PIECE OF METAL FLEW OFF, HITTING EE IN THE CHIN.