1 Low cutting force design improves hole accuracy Special chisel edge with S-curve reduces thrust force and controls vibration Cutting Force Comparison (Internal Evaluation) 4,000 Cutting edge image 3,000 35 % 2,000 DOWN 2,265 2,888 3,496 Thrust Force (N) DRA Standard Drill 1,000 0 DRA(GM) Competitor A Competitor B Cutting Conditions: Vc = 120 m/min, f = 0.25 mm/rev Drilling diameter ø14, L/D = 5, Drilling Depth 45 mm, Wet Workpiece: S50C 2 Optimal web thickness limits deflection Improved hole accuracy by controlling drill deflection with a 20% thicker web compared with Competitor C Roundness Cylindricity comparison (Internal evaluation) DRA(GM) Competitor D Competitor E Web Thickness Comparison UP 20 % DRA Competitor C Roundness Cylindricity 18.7 μm 23.6 μm 31.1 μm 34.3 μm 27.3 μm 30.1 μm Cutting conditions: Vc = 120 m/min, f = 0.3 mm/rev Drilling diameter ø14, L/D = 5, Measurement position 55 mm, wet workpiece: S50C 3 Fine chip breaking even in deep hole drilling applications Optimized chip thinning for stable chip evacuation Support groove with wider flute (5D, 8D and 12D) enables smooth chip evacuation Chip comparison (Internal evaluation) 5D Holder (First chip) DRA(GM) Competitor F Competitor G Cutting conditions: Vc = 60 m/min, f = 0.2 mm/rev, Drilling diameter ø14, L/D = 5 Drilling depth 70 mm, wet workpiece: SUS304 Support groove (Assist chip evacuation) 3
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