Built-up edge

Likely causes

• Cutting too cool: speed too low
• Sticky, gummy material
• An edge or geometry too negative

What to change

Fixes both makers give come first. Change one thing at a time, and see what it does.

1. 1

   Raise the cutting speed

   Sandvik · Mitsubishi

2. 2

   Use a sharper, more positive insert

   Sandvik · Mitsubishi

3. 3

   Use a PVD-coated or adhesion-resistant grade

   Sandvik · Mitsubishi

4. 4

   Raise the feed

   Mitsubishi

5. 5

   Turn the coolant on

   Mitsubishi

Work it out

• Surface finish predictor — the feed an Ra callout allows
• Turning speeds & feeds — a starting speed, feed and depth for your insert

Often comes with

• Rough, torn or hairy finish
• Burrs