Page 300 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 300

USER GUIDE
      GUNDRILLS  When using a gundrill on a lathe machine, a    Drill Penetration Instructions








              short solid carbide centering drill should be
              used prior to the gundrill. Once the gundrill
              enters the pre-drilled hole, it is self-guided.
                                                                   to and during hole penetration
               1 Drilling a pre-hole (drill diameter +0.02 mm)   1 Rotate the drill counterclockwise prior





                                                                 2 Stop the drill rotation and start the coolant
              Never try to penetrate the workpiece by using a gundrill






                                                                 3 Rotate the drill clockwise prior to drilling operation




               2 Gundrill penetration through the pre-hole





                                                                The influence of a Tool vs. Workpiece rotation
              A shallow pre-hole can’t lead the unbalanced gundrill  Rotating tool  Rotating   Rotating tool
                                                                                  workpiece    & workpiece









                           2 x D min


                                                                Worst         Medium         Best
                                                                The maximum misalignment between the
                                                                drill bushing and the workpiece center line
                                                                should not exceed 0.02 mm (.0008”).
                                                                   Rotating W orkpiece
                                                                                          Bushing

                                                                                            Stationary Drill


                                                                             Max.
                                                                             0.02 mm
                                                                             .0008"

















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