An employee was troubleshooting problems with the tooling on a mill roll. As part of the troubleshooting process, he had to feel the polished mill roll for imperfections as the machine was running. As he was feeling the roll with his hand, the roll pulled his hand into razor sharp sheet metal that is formed in the mill machine. Contact with the mill roll partially severed the tip of the employee's left index finger. The employee was hospitalized, and his fingertip was medically removed.