Page 278 - ISCAR(HOLE_MAKING_CATALOG_65)
P. 278

USER GUIDE
      DEEP DRILLING - BTA SYSTEM



          Technical Information - Notes for Guide Bushing Installation

              Many of the problems in BTA drilling are caused by                Flat Edge Type
              incorrect use of the guide bushing.
              The shape, type and tolerance greatly affect
              cutting accuracy and tool life.  Please note the
              following when using one in your application.
                              Resin Seal Type
                            Resin Seal


                    C0.3 0.5
                       ˜
                   Up to 1 mm                                     Workpiece       Guide Bushing  Oil Pressure Head
                   Up to 1.5 mm                                                 Recommended for Ø65 mm and less

                                                                              30 60°
                                                                               ˜
                   Workpiece      Guide Bushing  Oil Pressure Head
                                                                  0.5 1.0 mm
                                                                    ˜
                              Taper Cone Type


                                                                       C0.3 0.5   Guide Bush
                                                                          ˜
                  C0.3 0.5
                    ˜
                 Up to 2 mm                                                 Guide Bushing Tolerance



                Workpiece                                                               DG6 Dh6
                       Gap      Guide Bushing  Oil Pressure Head



                                                                   Tool Diameter D (mm)  G6  Tolerance (mm)
                                                                      8.00 - 10.00         +0.005 ~ +0.014
                                                                      10.01 - 18.00        +0.006 ~ +0.017
                                                                      18.01 - 30.00        +0.007 ~ +0.020
                                                                      30.01 - 50.00        +0.009 ~ +0.025
                                                                      50.01 - 80.00        +0.010~ +0.029
                                                                      80.01 - 120.00       +0.012 ~ +0.034
                                                                     120.01 - 180.00       +0.014 ~ +0.039
                                                                     180.01 - 245.99       +0.015 ~ +0.044






























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