Do a 5-Why on Chatter
Apply Five Whys to a CNC chatter problem and identify a controllable cause.
A thin-wall aluminum pocket chatters during pass two, then finishes with a measurable taper even after feed is reduced. Five Whys: symptom -> condition -> cause -> controllable countermeasure The common trap is to reduce feed or change spindle speed until the sound improves, then treat the quieter cut as the solution. That can hide the true cause, add cycle time, and leave dimensional error because the wall is still unsupported or the tool is still too long. Why 1 Why did the wall chatter on pass two? Because the wall began vibrating when radial engagement increased near the unsupported…
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