Insert, TPGH-322 Carbide

Swapped out a generic insert for this TPGH-322 and the 11° relief angle really helped with chatter on my lathe. Cutting aluminum, the single-sided chip breaker keeps the swarf from wrapping around the tool.

The single-sided chip breaker clears chips way better than I expected on aluminum, and the 11° relief cuts chatter down noticeably. Center hole alignment was spot-on with my tool holder, so seating took no fiddling.

The chip breaker really does what it's supposed to—chips come off in tight little curls instead of long strings, which makes a huge difference on my lathe. The 11° relief angle seats nicely in my tool holder without any wobble, and the single countersink hole lined up perfectly with the screw.