This last point is important, since all cutting tools, whether they are HSS, cobalt, or tungsten carbide (more on this shortly), benefit from coating, be it TiN (titanium nitride), TiAlN (titanium aluminum nitride), or one of the other many tool coatings available on the market today. Either way, be sure to follow the cutting tool manufacturer's recommendations. That doesn't seem like much difference, but together with cobalt's greater heat resistance, it supports higher cutting speeds-depending on the brand and whether the drill is coated, this might mean 50% faster spindle RPM and commensurately higher feedrates. Where "regular" M2 HSS comes in at a hardness of around 62 HRC, M35 starts at 65 HRC and M42 measures 67 or so. Read on.Ĭompared to regular M2 tool steel, M35 and M42 are indeed super. Despite their broad popularity, relatively low cost, and excellent mechanical properties, you’ll soon see why HSS and its cobalt counterparts aren’t always the best cutting tool materials for your drilling application. It’s this last group, HSS, that we’re here to discuss today, along with that most widely used of all cutting tools, the drill bit. These include D2, A2, H13, S7, and other tough, heat-treatable, and wear-resistant metals used to make everything from plastic injection molds to stamping dies to high-speed steel (HSS) cutting tools. This list is by no means complete, but we’d be remiss in not tagging a few members of the tool steel family. Steel and all its many alloys-stainless among them-range from “cuts like butter” to “why do I keep breaking tools?” There’s soft, stringy aluminum and polymers like ABS, Nylon, and Teflon.Ĭast iron is relatively abrasive but nowhere near that of glass and fiber-filled composites. Nickel-based superalloys like Inconel and Hastelloy are called “super” for a reason. Machine shops, maintenance personnel, and the manufacturing community overall face off against a veritable universe of different materials each day:
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