Sandvik Coromant Silent tools - application guide - Manual (Page 44)

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3. Turning
Be aware that re-directing forces can reduce deflection:
• Entering angle as close to 90° as possible (lead angle 0°) will
maximize the portion of feed force coming back from the work-
piece in the axial direction. A force in the axial direction will give
less tool deflection than equal forces in the radial direction.
• For internal turning the entering angle should never be less than
75° (lead angle 15°).
• The more positive the rake angle, the less cutting forces are
needed to machine the component. Less cutting forces means
less deflection.
• Less force in the radial direction giving less radial deflection