Page 129 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 129

USER GUIDE
                                                                                                                      INDEXABLE DRILLS



         Troubleshooting

                   Undersized holes      Oversized holes               Cone Hole













              Rotating drill                                    Rotating drill
            •  Check that overlapping is correct              •  Use shorter drill overhang (if possible)
              between inner and outer inserts                 •  Reduce feed by 30-50%
            •  Check inner insert over center                 •  Check that overlapping is correct
            •  Increase coolant pressure                        between inner and outer inserts
            •  Change the insert chipbreaker                  •  Check inner insert is positioned over center
                                                                within its limits
              Non-rotating drill                              •  Increase coolant pressure
            •  Check misalignment                             •  Change the insert chipbreaker
            •  Check that overlapping is correct
              between inner and outer inserts                   Non-rotating drill
            •  Check inner insert over center                 •  Check misalignment
            •  Rotate drill 180 degrees                       •  Check that overlapping is correct
            •  Increase coolant pressure                        between inner and outer inserts
            •  Change the insert chipbreaker                  •  Check inner insert is positioned over center
                                                                within its limits
                                                              •  Rotate drill 180 degrees
                                                              •  Increase coolant pressure
                     Pin in hole           Vibrations         •  Change the insert chipbreaker



                                                                    Bad Surface Finish







              Rotating drill
            •  Use shorter drill overhang (if possible)
            •  Reduce feed by 30-50%
            •  Check that overlapping is correct
              between inner and outer inserts                   Rotating drill
            •  Check inner insert is positioned over center within its limits  •  Improve chip formation (change chipbreaker
            •  Increase coolant pressure                        type or cutting condition)
            •  Change the insert chipbreaker                  •  Increase coolant pressure
                                                              •  Increase speed and reduce feed
              Non-rotating drill                              •  Stabilize clamping device
            •  Check misalignment
            •  Check that                                       Non-rotating drill
            •   is correct between inner and outer inserts    •  Improve chip formation (change chipbreaker
            •  Check inner insert over center                   type or cutting condition)
            •  Rotate drill 180 degrees                       •  Increase coolant pressure
            •  Increase coolant pressure                      •  Increase speed and reduce feed
            •  Change the insert chipbreaker                  •  Stabilize clamping device















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