Killing Chatter: How End Mill Geometry Fights Vibration

That sound coming from your CNC machine? That's chatter — and it's costing you parts, tools, and time. In this video, we break down exactly why chatter happens and how modern endmill geometry is engineered to stop it. We cover the three key features to look for: ✅ Variable Pitch / Index — staggered flute spacing that disrupts resonance ✅ Variable Helix — per-flute angle changes that prevent vibration lock-in ✅ Progressive Helix — angle transitions along each flute for continuous cutting variation Whether you're a seasoned machinist or just starting to dial in your process, understanding these geometry features will change how you think about tool selection. W.C. Chapman & Sons | Cutting Tools · Abrasives · Metalworking Fluids Serving machine shops in Maryland, Delaware, and beyond since 1950.