Threading Technology – Clamping Technology 520

426 Twist Drills VA STEEL Accessories 3 x D 5 x D 6 x D Tech. Info v c / f Product Finder 8 x D 2-3.5 x D 5.12 Technical information EF-Drill Modular Assembly of drill head into holder 1. Insert the cutting head into the cleaned holder. 4. Insert the second screw into the mounting bore and tighten it firmly. 2. Turn the cutting head clockwise up to the stop. 5. Tighten the first screw with the recommended torque. Retighten the second screw with the recommended torque. 3. Insert a screw into the mounting bore and tighten it gently. 6. Tool completely assembled. Tightening torques for clamping screws Size of insert seat Size Rec. tightening torque ft lbs Nm 2 Torx T7 0.44 0.60 3 Torx T8 0.65 0.88 4 Torx T8 1.13 1.53 5 Torx T9 1.80 2.44 6 Torx T15 2.70 3.66 7 Torx T15 3.85 5.22 Machining condition 2 x D > 2 x D External cooling possible up to 2 x D. From 2 x D drill in steps. Internal cooling should always be preferred. Recommended coolant pressure: > 20 bar. 0.02 mm Maximum axle offset 0.02 mm. max. 5° max. 5° Slanting entering and exit ≤ 5°. 0 10 20 30 40 50 60 70 80 90 Maximum run-out < 0.04 mm.