COMPETENCE IN PRECISION AND QUALITY STEP DRILLSStep drills Product information The flutes of new RUKO high performance step drills are CBN ground from the solid hardened form. Because CBN (cubical boron nitride) is a much harder abrasive than even silicium carbide or corundum, a better and sharper cutting edge is achieved - without burrs. And, with higher 1.4 1.4 dimensional precision the drills will last considerably longer while maintaining the precise pro- cess tolerances. 1. CBN ground spiral flute 1. CBN ground spiral flutes enable very sharp and burr-free cutting edges compared to the ordi- nary milled flutes. Especially the chip flow is optimized, so even long, non-breaking chips will be removed easily. The optimized chip flow protects the cutting edges and reduces built-up edges and cold weld marks. Due to these special features, cutting performance and tool life are extended significantly. 2. Each step has a radially adjusted relief produced by CBN grinding that relates directly to the diameter of the step. This means the cutting edge is always the highest point of the diameter. 3. Each step is axially CBN relief ground. This means the cutting edge is always the highest point of the axial cutting axis. 4. The cutting edge of each step has relief angle. This means the cutting edge is also the highest point in advance direction. 2. Radially adjusted relief produced by CBN grinding 5. The CBN ground bit ensures centering and spot-drilling even in thin-walled material. Product application 1. The ideal tool for sheet metal working in the following sectors of industries: electrical (size 4 + size 9), sanitary engineering and heating technics (size 6 + size 7) or automotive, mechanical engineering, aviation (size 0/5, size 0/9, size 1, size 2, size 3, size 5) and switching systems 3. Axially relief produced by CBN grinding (size 0/9k, size 1k, size 2k) up to 2 mm sheet thickness. 2. This tough tool is suitable for all standard industrial materials: nonferrous metal, special steel, thermoplastics and duroplastics as well as sheet metals up to 4 mm thickness. 3. This durable and versatile tool will center, spot-drill, bore and debur - all in one smooth, high performance working cycle. 4. By using RUKO cutting spray or RUKO cutting paste tool life will be considerably prolonged. 4. CBN ground relief angle 5. CBN ground bit with split point DIN 1412 C - 56 -