Trigon Insert Used on a Groove Insert-holder

This describes the capabilities and limitations of the Insert-groove holder with a Trigon insert.

This page discusses:

Capabilities of Groove Insert-holder with Trigon Insert

Groove insert-holders support Groove inserts, Round Inserts, and Trigon inserts.

An Internal, Frontal, or External Groove insert-holder with a Trigon insert is used in the following turning Machining Operations:

All strategies supported by Groove insert-holder with Groove insert are also supported by Groove insert-holder with Trigon insert.

In addition the following capabilities are available with the Groove insert-holder with Trigon insert configuration:

  • Collision avoidance with the part.
  • Update of computed rough stock with such tools.
  • Material removal simulation is supported with such tools.

See Tool Resources for Turning

Limitation when Using Groove Inserts

In general, it is recommended that the insert width of a groove insert is greater than the sum of the two nose radius values.

There is a limitation when you set one nose radius correctly for machining and then modifies the other nose radius: the computed tool path may not be correct when the modified radius is such that the insert width is equal (or almost equal) to the sum of the two radius values.

However, there is no problem when both radius values are equal and their sum equals the insert width.

Limitations of Groove Insert-holder with Trigon Insert

Some limitations exist due to an approximation of the tool insert in the algorithm.

  • Trigon insert bottom angle is always 10 degrees. A shift exists at the insert bottom, which is taken into account in the computation.

    This is particularly noticeable when machining low-slope-geometry shapes, that is, a shift is noticeable, in general, on inclined profiles and the shift is more, particularly, when machining profiles with comparatively less inclination.

    Case of a groove finishing cycle



    1 - Left tip position before shift

    2 - Left tip position after shift

    3 - Remaining material

  • Undercuts parts are not machined in groove finishing. The corresponding flank angles are set to 0 degrees instead of 20 degrees to avoid any risk of collision.

  • Twenty degrees are added from the real edge of the trigon insert when considering the gouging safety angle in the tool path computation.