Clean and degrease part thoroughly. Undercut the worn area plus 1/2” on either side. For ferrous metals undercut .015 minimum on the radius and for copper alloys undercut .030” minimum on the radius. Make sure to bevel all shoulders at 450 . Thread and undercut the area with fine threads 0.10” deep and coarse threads .030” deep. Leave about a 1/16” land between the end of the thread and the end of the undercut. Do Not Touch Area After Machining. Rotate work in the lathe at 50 – 125 RPM, set acetylene pressure at 5 psi and oxygen pressure at 6 psi. Set torch to a slightly carburizing flame and preheat base metal to 2000 F. Place the torch in a horizontal position to the work piece at a distance of 6” – 7”. Spray a minimum thickness of .005” - .007”.