![]() ![]() This is also used in cutting tools for cutting chromium molybdenum steel, Inconel, and other materials that are difficult to cut. To solve these issues, Kobelco developed SDG/MR film, a coating film that is carbon free and is strong against oxidation. FORMULAS FORMULAS RPM for UNC/UNF Taps Feed Rate for UNC/UNF Taps RPM (revolution/minute) cutting speed (SFM) × 3.82 Tap diameter IPR(inch/revolution) 1 inch Threads per inch (TPI) IPM(inch/minute) RPM Threads per inch (TPI) RPM for M/MF Taps RPM(revolution/minute) cutting speed (SFM) × 97. Provides a better wear resistance than TiN. The standard finish is used on alloy steel, aluminum, and plastic. The most popular coatings include: Titanium Nitride (TiN). We suggests a minimum of 2-3 times the horsepower of drilling for standard tapping processes. Coatings on end mills increase hardness, enhance tool longevity, and allow for faster cutting speeds. Meanwhile, CBN sintered tools use a material that has both high hardness and low reactivity to iron, but as the temperature increases during cutting, the base material oxidizes, shortening the service life of the tools. Tapping generally runs at around 1/3 to 1/4 the RPM of drilling. While diamond-like carbon (DLC) coated tools and diamond tools are effective in that they have a high hardness, the carbon, which is the main component, has a higher reactivity to iron, so they are not suitable for machining iron materials. Tools for machining high-hardness materials of HRC60 or higher require an extremely hard coating film. There is less wear than general aluminum titanium nitride film, and peeling of film at the start of cutting can be controlled. Cold forming taps require more power on the spindle, compared to a cutting tap of the same size, since it generates higher torque. ![]() Lasts 3 to 20 times longer than fluted taps with cutting edge. Constructed without flutes for a stronger, more solid tap. Optimizing SDG/MR film can improve adhesion and wear resistance. Better thread gaging and reduced oversized thread productivity. ![]()
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