Abstract: At approximately 7:30 a.m. on October 18, 2010, Employee #1 was conducting the first work of the day on a flat plane router. In preparation for metal routing, Employee #1 programmed the computerized numerically controlled router to perform a surface cut on a wood sheet. He was standing in front of the computer monitor, approximately 64-in. from the cutting head. When he activated the router program, the spindle arm began to spin up to approximately 14,400 RPMs at a height of approximately 12-in. above the wood sheet. Before the cutting head made contact with the wood, two carbide inserts became detached from the spindle arm. Employee #1 was injured when one of the inserts struck him in the lower abdomen and pierced his colon. He was hospitalized for surgery and treatment of his injury.