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Parting and grooving

Internal grooving

Internal grooving

Long overhangs and poor chip evacuation are two of the challenges with internal grooving. Long overhangs can cause problems with both deflection and vibrations. Vibrations and poor chip evacuation can cause insert breakages. Difficulties with chip evacuation can also lead to poor surface finish. The most common internal grooving process is radial grooving, however multiple grooving (A) and plunge turning (B) can also be used.

Internal grooving application tips


  • Precision coolant with high flow improves chip control and evacuation
  • A smaller bar improves chip evacuation but reduces stability
  • To avoid vibration, the set-up should have the shortest overhang with the lightest cutting geometry
  • Vibration can be avoided by using several cuts with a narr​ower insert. End with a finishing operation (see illustration (A) right)
  • An internal groove can also be machined with a single cut followed by plunge turning (B). Start at the bottom and machine from the back of the hole to the front to obtain best chip evacuation​​
  • Use a smaller insert width and corner radii for lower cutting forces
  • For accurate machining with lower vibration and precise height, use a clamping solution designed to support this, like EasyFixTM sleeves​


For overhang 5−7xD, use carbide reinforced dampened bars
L = 5−7xD

For overhang 3−6xD, use dampened or carbide bars​
L = 3−6xD

For overhang below 3xD, use steel bars ​
L ≤ 3xD

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