Page 421 - ISCAR(TURNING-CATALOG-42-2022)
P. 421

USER GUIDE







              What is a GRIP Insert?                            Principles of Turning with Groove-Turn Tools          GROOVE-TURN
              A grip insert is a grooving, groove-turn or parting insert   The basic principle in turning with groove-turn tools is
              that is clamped between 2 prisms.                 the deflection of the cutting tool, which results in a frontal
              Clamping a grip insert correctly in the holder    clearance angle αº between the insert and the workpiece.
              is necessary for stable machining.                The clearance angle αº is a function of the side cutting
            1 Ensure that the seat is clean of dirt and swarf.  forces and is not constant, as is the case with ISO inserts.
            2 In the first stage of clamping, ease the insert gently into   The deflection is influenced by the following factors:
              place. Make sure that the prismatic surfaces match.  Feed: f
            3 Always use the wrench supplied with the tool.     Depth of Cut: ap
              Use reasonable force to the point of resistance   Overhang of Insert Support: T
              for final clamping.                               Width of Insert Support: A
              The maximum recommended clamping torque is
              1.5xd Nm or 15xd Kgf x cm. d=clamping screw dia. in mm.  Cutting Speed: Vc
                                                                Workpiece Material
                                                                When all of the above factors remain constant
                                      1                         during turning, a high degree of accuracy with a
                                                                tolerance up to ±0.01 mm can be achieved.

                                                                     f

                                                                                       ap              α°
                 2                     3                                     T







                   It is very important not to overtighten a grip insert, even though
                   you may get the impression that the insert is more secure. When
                   overtightened, the insert doesn’t clamp into its correct and
                   carefully designed clamping points, and therefore, is less stable.


              Positioning the Tool on the Turret                                                                      TEXT
              Successful machining can be achieved only
              if the tool is properly positioned on the turret.
              The following sequence should be followed:
                                                                               A
            •  Position the grip holder perpendicular to the workpiece;
              deviation may be 0.10/100 mm along the holder         If the conditions are too light (such as in a super finish
            •  Check to ensure that the frontal cutting             operation), there may not be enough deflection and the
              edge is aligned parallel to the workpiece             clearance angle will be very small. This may result in chatter
                                                                    and vibration.
                       30  40
                      20  50
                                             f
                      10  60
                          70
                      0
                       90  80
                         0.10/100          α°
                         90° ±10'



                   If the cutting edge is not parallel to the workpiece or is
                   positioned as shown, the deflection during machining (in the
                   indicated direction) will be too small and chatter may occur.












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