Page 130 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 130

USER GUIDE
      INDEXABLE DRILLS  Chip jamming                                  Broken Screw



















                                                              •  Lubricate the screw before tightening
              Rotating drill                                  •  Use recommended torque wrench
            •  Improve chip formation (change chipbreaker
              type or cutting condition)                         Insufficient machine power-
            •  Increase coolant pressure
              Non-rotating drill
            •  Improve chip formation (change chipbreaker
              type or cutting condition)
            •  Increase coolant pressure


                                                              •  Reduce speed and feed
                      Deflection                              •  Use recommended chipbreaker for low feed



                                                                 Insufficient machine torque








              Rotating drill
            •  Use shorter drill overhang (if possible)       •  Reduce feed
            •  Reduce feed by 30-50%                          •  Use recommended chipbreaker for low feed
            •  Check that overlapping is correct
              between inner and outer inserts
            •  Check inner insert is positioned over center within its limits
            •  Increase coolant pressure                        Chip Formation Problems
            •  Change the insert chipbreaker
            •  Stabilize clamping device                        Long chip/ Chip jamming:
                                                                This typical problem with stainless or low carbon steel,
              Non-rotating drill                                can affect hole quality, especially on surface finish, and
            •  Check misalignment                               in some cases can cause insert or tool breakage.
            •  Check that overlapping is correct
              between inner and outer inserts
            •  Check inner insert is positioned over center within its limits  Optimal Shape  Too Long  Too Tight
            •  Rotate drill 180 degrees
            •  Increase coolant pressure
            •  Change the insert chipbreaker





                                                                               If machining at   Increase
                                                                               high speed, first   speed within
                                                                               reduce speed.   recommended
                                                                               If unsatisfactory,   limits. If not
                                                                               increase feed, but  satisfactory,
                                                                               do not exceed   decrease feed.
                                                                               upper limit.








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