An employee was fabricating an evaporator fixture. The fixture was sitting on a table and the employee was utilizing a hoist and chain sling hooks to elevate one side of the fixture into position to weld a piece on it. The hoist moved slightly on the bridge trolley, creating slack in the chain that caused one of the legs of the sling to come out of the square tubing. The evaporator fixture came down onto the employee's right ring finger, pinning it against the table. The employee's finger was partially amputated and was later surgically amputated above the knuckle.