Use recommended cutting parameters for specific application.Choose coating suitable for specific application.Use correct tap, with more relief or longer chamfer if possible.Improve quality (richer emulsion, neat oil) and quantity (higher pressure) of lubrication.For deep blind holes (≥ 2,5xD) use taps with back-tapering.Check tap alignment and run-out of tap on tapping attachment.Check drilled hole size is not too small.Choose correct tap, with lower rake angle or longer chamfer.Nodular cast iron, malleable cast iron, tempered cast ironĪluminium wrought and die cast alloys with Si 10% (short chipping)Ĭopper alloys (long chipping), soft brassĬopper alloys (short chipping), hard brass The oil grooves improve lubrication in the chamfer area making these taps suitable for threading deep holes.įerritic stainless steel, martensitic stainless steel, precipitation hardening No chips are produced during the tapping process. These tools produce threads through plastic deformation of the workpiece material. This geometry is suitable when tapping through holes on materials which produce continuous chips. This design ensures spontaneous chip evacuation in the feed direction. The spiral point or gun nose is produced by a high helix angle combined with an increased rake angle in the front area of the tap. The interrupted threads avoid chips sticking to the thread flanks and consequent damage of the tap. The large flutes and high helix angle ensure efficient chip removal on long-chipping light alloys such as aluminium.įor tapping soft and mild materials such as iron, aluminium etc. SPIRAL FLUTES, 40° RIGHTHAND SPIRAL, FOR LIGHT ALLOYS The high helix angle ensures the evacuation of chips from deep blind holes. These taps improve chip evacuation and are well suited when tapping blind holes of medium depth on tough materials. These taps are used on steels with normal strength and toughness (R=750 N/mm2) as well as on short-chipping abrasive materials (grey cast iron, bronze, etc.).
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