Choosing the insert radius for a particular application is a combination of many factors. The corner radius of the groove-turn insert influences the product shape and tool life.

• A larger radius in turning operations normally improves surface quality.
• An insert with a larger radius has a better distribution of the cutting load and of the generated heat. It is stronger and ensures longer tool life.
• Small radii on GRIP inserts result in increased side forces and side deflection, preventing instability, especially with small depth of cut and feed.
• The best radius to use is basically determined by the geometry and dimensions of the workpiece. The more securely the workpiece is fastened into the machine tool, the larger the radius may be.
• When the ratio of a workpiece length compared to its diameter is large, inserts with smaller radii will prevent chatter.
• A larger corner radius enables machining at a larger feed rate.
• In profiling operations, inserts with larger corner radii or full radii are required.