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Unformatted text preview: 50 feet / minute High Speed Steel (M2) 100 ft./min Cast Cobalt Alloys (Stellite) 125 to 150 ft/min Carbides (C5) 300 to 400 ft/min or higher, surface coatings can increase speeds Ceramics 1600 ft/min CBN Material approaches hardness of diamonds, but is not appropriate for machining mild steel. Diamonds Essentially unlimited speeds but limited to shallow depths of cuts. Primarily used to cut non-ferrous materials...
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- Fall '07