Page 182 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 182

USER GUIDE
      SOLID CARBIDE DRILLS



          Troubleshooting
                  Problem                    Cause                                 Solution
                Drill breakage   •  Poor clamping of the chuck  •  Check the clamping. Use hydraulic clamping chuck,
                                                                maxin power chuck or a shrink system.
                                 •  Workpiece movement        •  Increase workpiece chucking force.
                                 •  Wrong drill               •  Check drill type and drilling depth, cooling
                                                                system and workpiece material.
                                 •  Insufficient coolant      •  Check cooling lubricant. Increase coolant
                                                                pressure. In the case of external coolant supply,
                                                                improve jet direction and add cooling jets.
                                 •  Unsuitable cutting conditions  •  Reduce feed.
                                 •  Worn out drill center point (chisel)  •  Regrind cutting edge.
                                 •  Insufficient chip evacuation  •  Use pecking cycle.


















          Chipping on the cutting corners •  Poor clamping of the chuck  •  Check the clamping and adaptation. Use hydraulic
                                                                clamping chuck, maxin power chuck or a shrink system.
                                 •  Workpiece movement        •  Increase workpiece chucking force.
                                 •  Wrong drill               •  Check drill type and drilling depth, cooling system
                                                                and workpiece material. Possibly use longer drill.
                                 •  Insufficient coolant      •  Check cooling lubricant. Increase coolant
                                                                pressure. In the case of external coolant supply,
                                                                improve jet direction and add cooling jets.
                                 •  Unsuitable cutting conditions  •  Check cutting parameters, and possibly reduce feed.
                                 •  Worn out or broken cutting corner  •  Replace drill or regrind cutting edge.
             Problem: Burrs on exit  •  Unsuitable cutting conditions  •  Reduce feed by 30-50% during exit.
                                 •  Worn out drill            •  Replace drill.






              Rough surface finish  •  Unsuitable cutting conditions  •  Adjust feed to improve chip flow.
                   Ra            •  Large runout              •  Make sure that the drill’s runout is within
                                                                0.02 mm (radial & axial).
                                 •  Chip jamming              •  Reduce cutting speed.
                                                              •  Increase coolant pressure.
                                                              •  Apply pecking procedure.
            Deviation of hole position  •  Large runout       •  Make sure that the drill runout is within 0.02 mm (radial & axial).
                                 •  Poor stability            •  Check and improve drill and workpiece clamping rigidity.
                                 •  Rough application         •  When drilling hard materials or sloped surfaces,
                                                                reduce feed by 30-50% during entrance.
                                                              •  Use a short pilot drill with 140° point angle.















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