Sandvik Coromant Silent tools - application guide - Manual (Page 70)

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4. Boring
Insert shape and entering angle/lead angle
Use entering angle 90° (0°) for roughing and 92°(-2°) for finishing.
Less force in the radial direction gives less radial deflection and
vibration. Triangular-shaped inserts (T-style) are first choice for
boring operations. CoroTurn® 107 inserts meet these requirements
and are first choice.
Nose radius
The nose radius, RE, on the insert is a key factor in turning
operations. Selection of nose radius depends on the:
• Depth of cut, AP
• Feed, f
n
and influences the:
• Surface finish
• Chip breaking
• Insert strength
Small nose radius
• Ideal for small cutting depths
• Reduces vibration
• Less insert strength
Large nose radius
• Heavy feed rates
• Large depths of cut
• Stronger edge
• Increased radial forces