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Chatter. If you've spent any time in a machine shop, you’ve probably heard it—literally. That high-pitched squeal, the vibration marks on your finish, or worse—snapped tools. Chatter can be one of the most frustrating challenges in milling, costing time, money, and part quality. At Skookum Tools, we’ve engineered our end mills specifically to help machinists reduce or eliminate chatter, so you can focus on what matters: precision, productivity, and performance. What Is Chatter and Why Is It a Problem? Chatter is the result of self-excited vibrations between your cutting tool and the ..