Ruko main catalogue precision tools Page 17
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Point grinding and pointing according to DIN 1412 N Shape N: Helical point normal ground Application: For all normal drilling work in steel, non-ferrous metal and plastic. The point angles depend on the ease with which the materials can be cut. Advantages: Powerful main cut, resistant to impact and lateral forces. Simple manual grinding possible. Disadvantages: Broad cutting edge requires considerable pressure. A Shape A: Cut chisel edge Application: For all normal drilling work using drills with a strong core, for drilling into solid materials with larger drill diameters. Advantages: Good centering when starting to drill, as the length of the chisel edge is reduced to 1/10 of the drill diameter, and fewer pressure is required. Disadvantages: Additional regrinding work. B Shape B: Cut chisel edge with corrected major cutting edge Application: For r drilling high-density steel, for manganese steel with over 10 % Mn, for hard spring steel and for drilling out. Advantages: Resistant to impact, one-way load and lateral forces. Does not catch in thin workpieces. Disadvantages: High pressure required, tendency to slip, extra work involved in regrinding. C Shape C: Split point Application: For high pressure required, tendency to slip, extra work involved in regrinding. Advantages: Good centering, little pressure required. Chip spreading improves chip removal. Disadvantages: Perfect grinding only possible by machine. D Shape D: Ground for grey cast iron Application: For drilling grey cast iron, malleable cast iron and forgings. Advantages: Wear on cutting corners is reduced by extended major cutting edges, resistant to impact, good heat conductivity, all giving improved tool life. Disadvantages: Perfect regrinding only possible by machine. E Shape E: Centre point Application: For drilling sheet-metal and soft materials, for blind holes with flat bottoms. Advantages: Good centering, minimal formation of burrs when through-drilling, precise drilling in thin sheets and pipes, does not catch. Available in diameters of Ø 2.5 mm upwards. Disadvantages: Sensitive to impact and one-way loading. Can only be ground to perfection by machine. N A B C D E 01 Other bevelling and sharpening U U Shape U: Special ground Applications: For drills with sturdy profiles suitable for use in automated processing, with narrow grooves and strong cores. Advantages: extremely good self-centering behaviour when maximum cutting valuminiumes are employed. Concave cutting produces short metal chips. Disadvantages: Extra work involved in regrinding. 15
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