After checking chip evacuation, inspect the cutting edge under safe conditions. Different damage mechanisms can require different responses.
| Pattern | Review first |
|---|---|
| Flank wear | Cutting speed and grade wear resistance. |
| Chipping | Edge toughness, geometry and possible built-up edge. |
| Built-up edge | Adhesive work material, cutting temperature and geometry; simply slowing down may be inappropriate. |
Record “small pieces missing from edge” as an observation; “grade too brittle” remains a hypothesis. Photograph the edge, identify the insert and work material, and retain cutting data. Confirm the pattern with supplier guidance before a controlled change.