Q (liter/min)Coolant flow Coolant pressure (MPa) GradeInsertExt. ToolholderInt. ToolholderThreadingGroovingMiniature toolMilling cutterEndmillDrilling toolTooling SystemUser's GuideIndex User’s Guide - Technical Reference A Drilling To o l s B Te c h n i c a l guidelines ᭹When to change drill heads (Criteria for the end of tool life)The criteria to identify the time for tool change are as follows: C - 0.2mm 0.3 P 1.25 P x mm 0.15 + ø > DC Raø = DCmm 0.03 - ø < DC D Width of corner wear Spindle load exceeds Hole diameter is 0.15 mm Surface roughness Vibration or unusualreaches 0.2 – 0.3 mm.125% of the normal value.larger or 0.03 mm smallerdeteriorates.noise occurs.than the drill diameter.E ᭹How to clamp the drill head F ᆰ Clean and lubricate the pocket. ᆱ Set the drill head into the pocket. Air blast etc. G H ᆲ Set the clamping key on the drill head ᆳ Clamp I J ᭹Coolant supplyInternal coolant supply is The required coolant flow and pressurerecommended.30 1.75 K 1.5 L/D = 12 2010 L/D = 81.25L/D = 51L/D = 30.75 L 5 0.5 0.25612162026612 16 20 26 M Drill diameter: DC (mm) Drill diameter: DC (mm) Tungaloy L071