Edge deforms or overheats

Likely causes

• Too much heat and pressure: speed and feed too high
• A grade too soft for the heat
• Too little coolant

What to change

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

1. 1

   Lower the speed and feed

   If the edge is pushed down, lower the feed first; if it bulges at the flank, the speed.

   Sandvik · Mitsubishi

2. 2

   Use a more open, positive geometry

   Sandvik · Mitsubishi

3. 3

   Use a more heat-resistant grade

   Sandvik

4. 4

   Get more coolant to the edge

   Sandvik

5. 5

   Take a lighter cut

   Mitsubishi

Work it out

• Turning speeds & feeds — a starting speed, feed and depth for your insert

Often comes with

• Inserts wear out fast
• Edge chipping or breaking