EE WAS SITTING AND BUILDING UP A TOOTH BASE ON A 2550 DRAGLINE BUCKET. HE WAS USING A 7"" DISC GRINDER, GRINDING THE FRONT OF THE BASE WHEN HE HEARD A NOISE TO HIS RIGHT. HE TURNED TO SEE WHAT IT WAS AND EVIDENTLY AS HE TUEN HIS BODFY ENOUGHTHAT HIS PANT LEG WAS CAUGHT BY THE GRINDER WHEEL WHICH PULLED THE GRINDER INTO HIS KNEE CAP. EE WAS IN THE BUCKET BUILDING.