Page 424 - ISCAR(TURNING-CATALOG-42-2022)
P. 424

USER GUIDE
      GROOVE-TURN  Machining Tips                               Internal Machining






              Correct grooving sequence
              When making a groove where the insert’s width is not
                                                                Improving Internal Turning in a Blind Hole
              identical to the groove, it is recommended to select an
                                                                Internal turning in a blind hole brings about the
              insert that will enable grooving symmetrically in such
                                                                problem of chip exit. When the tool reaches the rear
              a way that the material is always in the center
              of the insert. This practice will ensure better
                                                                and the insert, possibly causing insert breakage.
              chipbreaking and symmetrical cutting forces.
                                                                Two solutions that can eliminate this problem:
                1                                               side wall, chips may be caught between the wall
                                                                First Solution
                                                                1 Start by grooving at the rear wall.
                                                                2 Continue by turning from the inside toward the outside.


                2                                                               1
                                                                                        2






                3


                                                                Second Solution
                                                                1 Start by grooving at the rear wall.
                                                                2 Pull the tool back toward the outside.
                                                                3 Turn the final diameter from outside, toward the groove.
              Eliminating a “Hanging Ring”
              When turning at the end of a bar or towards a recess             1   2   3
              between two walls, a “hanging ring” may be formed.                       5  4
      TEXT    To eliminate the unwanted “hanging ring”:

                                  1








               1 Turn toward the recess. Stop a short           Optimizing Internal Machining Toolholder Overhang
                 distance before reaching the recess.           It is always recommended to use the minimum possible
                            3       4                           overhang in order to maintain maximum toolholder
                      2                                         rigidity. As a general rule, maximum overhang should
                                                                not exceed three times the holder-bar diameter.
                                                                                  Lmax.≤3D


                                                                                     ¯D
               2 Pull back the groove-turn tool and re-position it.
                                5



                                                                                             LÊmax.



               3 Machine as shown. This final operation achieves
                 the size and flatness of the side wall.




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