Page 121 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 121

USER GUIDE




          Machining Conditions

              Cooling Methods                                   How to Select Cutting Parameters
              Directing the coolant through the tool is essential
              for reliable machining. This method prevents      Step 1 - Prior to Drilling                            INDEXABLE DRILLS
              chip pile up, insert damage or breakage,        •  Use charts on pages 122-124 to select feed
              and damage to the workpiece surface.              and speed according to workpiece material.
                                                              •  For the first grade choice, in general we
                   Internal Coolant     External Coolant        recommend selecting IC808.

                                                                Step 2 - Initial Test Hole Drilling
                                                              •  Evaluate chip evacuation. If not satisfactory, adjust
                                                                feed and speed, using example photos below.
                                                              •  If chip evacuation is still a problem, i.e. chips are too
                                                                long, change the chipbreaker to GF as shown below.

                                                                                 SOMT/SOMX









                                                                    Too Tight   Optimal Shape    Too Long
               Apply standard cutting data.  Drilling depth is limited
                                    to 1.5xD.  For larger
                                    depths, a pecking cycle
                                    is recommended.




                               Rotating Drills
                                                                may cause                    may cause
                                                                insert damage                tool damage


                                                                Optimizing Chip Shape
                                                                Chip control is one of the most important factors for
                                                                tool performance in order to facilitate chip evacuation
                                                                and avoid tool damage.
                                                                Cutting conditions must be adjusted
                                                                to achieve optimal chip shape.
                                                                        How To Achieve Optimal Chip Shape
                                                                Too Tight                    Too Long
                                                                Increase                     If machining at
                                                                speed within                 high speed, first
                                                                recommended limits.   Optimal   reduce speed. If
                                                                If not satisfactory,   Shape  unsatisfactory,
                                                                decrease feed.               increase feed, but
              For best results:                                                              do not exceed
            1  Check adapter rigidity.                                                       upper limit.
            2  Minimize drill runout in relation to spindle center line.
            3  Use recommended cutting conditions.




















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