Page 128 - ISCAR(HOLE_MAKING_CATALOG_65)
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USER GUIDE
      INDEXABLE DRILLS  Irregular Conditions for DR Drills           Chipping Along    Machine Troubleshooting



         Troubleshooting










                                                                                             Vibrations
                                                                      Cutting Edge
              If surface slope exceeds 5º, reduce feed by 50%
                                                                                             Solutions
                                                                       Solutions
              during penetration or when exiting. It is preferred
              to pre-face the surface to eliminate slope.
                                                                2  Choose a tougher grade. 2  Check mounting
                                                                                        of workpiece.
                                                                3  Choose a geometry
               1             2             3                    1  Reduce entrance feed.  1  Check mounting of drill.
                                                                  with open chip breaking   3  Increase feed. If drilling
                                                                  for higher feeds.     a very soft material,
                                                                  (SOMT, WOLH)          reduce feed and
                                                                4  Reduce feed.*        increase speed.*
                                                                5  Reduce cutting speed.  4  Reduce cutting speed.
                                                                6  Increase coolant
            1 Drilling into a pre-hole reduces feed to            pressure.
                           (1)
              eliminate deflection  of the drill body.
            2 Drilling an interrupted cut reduces feed during crossing
                            (1)
              to eliminate deflection  of the drill body.
            3 Insufficient stability of workpiece requires
              additional support. Reduce feed.
              (1)  Deflection may be observed by a mark on the drill body.
              Note: For irregular applications, use  DR drills with XOMT   Chipping of Center Insert  Insufficient Torque
              inserts as a first priority.
                                                                       Solutions             Solutions
              Stacked Plates                                    1  Check mounting of drill.  1  Reduce feed.*
              Drilling operation is not recommended, but may be done   2  Check mounting   2  Choose a geometry with
              by specially designed drills in 16-60 mm range.     of workpiece.         a looser chipformer.
              Apply standard cutting data.                      3  Reduce entrance feed.
                                                                4  Reduce cutting speed.
                        Regular Conditions for DR Drills        5  Check drill runout
                                                                  (should be 0.05 mm
                                                                  maximum).




              Note: For irregular applications, use  DR drills with XOMT inserts
              as a first priority.
              Indexable Insert Drills -
              Troubleshooting DR Chips                             Excessive Flank Wear   Insufficient Power
                                                                       Solutions             Solutions
                    Chip Jamming due       Chip Jamming
                      to Long Chips       despite Short Chips   1  Reduce cutting speed.  1  Reduce cutting speed.
                                                                2  Increase coolant   2  Reduce feed.*
                                                                  pressure/volume.    3  Choose a geometry with
                                                                3  Choose a better wear   a looser chipformer.
                                                                  resistant grade.
                       Solutions             Solutions          * Use GF chipformer
               1  Increase feed. If drilling a   1  Increase coolant
                very soft material, reduce   pressure/volume.
                feed and increase speed.  2  Reduce cutting speed.
               2  Choose a geometry with
                a tighter chipbreaker
                for lower feeds (GF).
               3  Long chips that rotate around
                the drill are problematic.
                If chip formation can not
                be improved by changing
                the machining conditions,
                use a pecking cycle.







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