Use this short checklist before changing speed and feed. A surface mark or noise is an observation, not a confirmed diagnosis.
| Check | Reason |
|---|---|
| Tool assembly | Minimize unnecessary overhang and verify rigid clamping. |
| Workpiece support | Support the part against the cutting-force direction. |
| Cutter engagement | Review radial engagement and cutter pitch; many engaged teeth can promote vibration. |
Record tool, overhang, material, speed, tooth feed, depth and width. After safe inspection, change one approved variable at a time and compare surface quality, sound and tool condition. Log the result even when it does not improve.