Abstract: At 10:30 a.m. on April 16, 2019, an employee had been working on an order of approximately 35 cylinders when he noted that one of the 12 inch 25 pound cylinders had a mark on it and decided to place the piece back into the Okuma 345 Metal Lathe CNC machine. The employee positioned the cylinder by hand between the CNC machine spindle and the lathe tailstock. Holding the cylinder in place with the thumb of his right hand inside the hollow cylinder, he activated the tailstock by foot pedal. As the tail stock moved into the cylinder the employee was unable to remove his thumb fast enough and the tailstock struck his thumb. The employee amputated his thumb below the knuckle and required medical treatment to reattached the thumb part. The employee was not hospitalized.