b'So Exotic for thread mill makers. While harder,(they) want to remove per pass andcarbide is not impervious to theadjust spindle speed to achieve the crystalline structure of martensiticbest thread quality, Ford said.a lot of heat that gets put back intosteel or other properties of super-the tool, he said. Temperaturesalloys. But carbide can withstandComputer-Drivenabove the oxidation point will beginthings better. Tapping is a much simpler proce-to oxidize the coating, and then itIn addition, through CNC pro- dure that can be done quickly on a gets down to (cutting with) the baregramming and the smaller major di- variety of machines. Thread milling metal. ameter of the cutting tools, usersexotic materials, however, requires Carbide is the material of choicecan select how much material thatat least a three-axis CNC machine North American ToolThese thread mills feature a helical flute design and are manufactured from premium micrograin carbide for increased life and improved thread quality.66AUGUST 2020Threading.indd 66 7/17/20 3:34 PM'