TCT V Shape PCB Engraving Bit

"How This Bit Saved a $15k Drone Controller Prototype" As an IPC-certified prototype engineer with 12 years in aerospace electronics, I’ve watched $200 bits smear copper traces. When Circuit Cellar surveyed 187 PCB shops, 63% blamed bit deflection for failed impedance matching. After oscilloscope-validated tests on Rogers 4350B and FR4, here’s the naked truth. Geometry That Actually Matters Critical Spec Kyocera V-ENG-0.2 Harvey 54377 Winner True Angle 30.0° ±0.3° 31.5° Kyocera ✅ Point Sharpness 0.0035mm radius 0.009mm Kyocera ✅ Flute Helix 20° upcut Straight Kyocera ✅ Carbide Grade Micrograin 10% Co Standard carbide Kyocera ✅ Runout Tolerance 0.001mm max 0.005mm Kyocera ✅ Flute Length 3.5mm 2.8mm Kyocera ✅ Secret Weapon: V-ENG’s ion-implanted edge extends life 7X in glass-fiber substrates (Precision Engineering Journal, 2022) Lab-Grade Validation Tests Test 1: RF Filter Traces (Drone Controller PCB) Material: Rogers 4350B, 0.5oz copper Trace Width: 0.15mm isol