PFERD Tools Main Catalogue Page 185
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Drilling tools HSS spiral drill Recommended rotational speed range [RPM] To determine the recommended cutting speed range [m/min], please proceed as follows: ① Select the material group to be machined. ② Select the type. ③ Establish the cutting speed range. To determine the recommended rotational speed range [RPM], please proceed as follows: ④ Select the required diameter. ⑤ The cutting speed range and the diameter determine the recommended rotational speed range. ① Material group Steel, cast steel Stainless steel (INOX) Non-ferrous metals Cast iron Plastics, other materials Steels up to 700 N/mm² (< 220 HB) Steels over 700 N/mm² (> 220 HB) Construction steels, carbon steels, tool steels, alloyed and non-alloyed steels, case-hardened steels, cast steel, tempering steels Rust and acid-resistant steels Soft non-ferrous metals Austenitic and ferritic stainless steels Aluminium alloys Brass, copper, zinc Hard non-ferrous metals Bronze, titanium/titanium alloys, hard aluminium alloys (high Si content) Grey cast iron, white cast iron 2 ② Design ③ Cutting speed STEEL 25–35 m/min STEEL INOX Cast iron with flake graphite EN-GJL (GG), with nodular graphite/nodular cast iron EN-GJS (GGG), white annealed cast iron EN-GJMW (GTW), black annealed cast iron EN-GJMB (GTS) Fibre-reinforced thermoplastics and duroplastics, hard rubber, wood 20–25 m/min INOX 10–20 m/min STEEL INOX 30–60 m/min STEEL INOX 25–50 m/min STEEL 10–25 m/min INOX STEEL 15–40 m/min INOX Catalogue Page 2 97
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