HSS Roughing End Mill 4 Flute

"How This Mill Saved Our D11 Bulldozer Ripper Tooth Project" As a certified tooling engineer with 17 years in mining equipment rebuilds, I've seen 300carbideendmillsexplodein4140HT.When∗ModernMachineShop∗surveyed89jobshops,∗∗7122k/year on premature roughing tool failure**. After strapping accelerometers to 48 cutters, here's what your CAM software won't tell you. The Tooth Geometry That Defies Obsolescence Critical Spec Champion 725-4E Niagara N77707 Winner Flute Form Variable helix 42° 30° constant helix Champion ✅ Edge Prep 0.002" T-land Sharp edge Champion ✅ Core Diameter 78% of OD 70% Champion ✅ Steel Grade M42 Cobalt HSS M2 HSS Champion ✅ Chip Splitters Asymmetric Symmetric Champion ✅ Hardness 65-67 HRC 63-65 HRC Champion ✅ Game Changer: Champion's cryogenically treated substrate increases edge retention by 55% in work-hardened materials (ASM Handbook Vol 4E, 2021) Interrupted Cut Carnage Tests Test 1: D11 Ripper Shank (4140 HT @ 36 HRC) Conditions: 40% int