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USER GUIDE
      SOLID CARBIDE DRILLS



         General - Calculations

                               -1
              Spindle Speed (min )                               Example
                  c
              n=  v  ∙1000                                       Drill DR 220-044-25-07-2D-N (Ø22 mm) - Material No. 4
                  π ∙ D

                                                                              k=90º, sin k=1
                                                                           2
                                                                 kc=2200 N/mm
                                                                 vc=200 m/min  CMh=50 $/h  η=0.75
              Cutting Speed (m/min)                              km=1 kf=1    f=0.15 mm/rev  L=25 mm  h=10 mm
                   π ∙ D ∙ n
                                                                               200 ∙ 1000
              vc =     1000                                      n =  vc ∙ 1000           π ∙ 22     = 2894 min -1
                                                                              ∙

                                                                         π ∙ D

              Table Feed (mm/min)                                vf = f ∙ n=0.15 ∙ 2894 = 434 mm/min
              vf = f ∙ n
                                                                                  =
                                                                 Q =  vf  ∙ π  ∙ D 2      434 ∙ 3.14 ∙ (22) 2


                                                                                        4000


                                                                            4000
                                     3
              Material Removal Rate (cm /min)                    = 165 cm /min
                                                                        3
                   f
              Q=  v  ∙ π ∙ D 2                                   Pc =          Q         ∙ Kc ∙ sin k
                     4000


                                                                           60.000 ∙  η

                                                                 =        65    ∙ 2200 ∙ 1 =8.06 kW


              Power Requirement (kW)                                    60.000 ∙ 0.75
                                                                               D 2
              Pc =       Q              ∙ kc ∙ sin k             Mc =   f ∙ Kc      ∙     ∙ sin k
                                                                          10000

                                                                                8

                   60.000 ∙ η

                                                                  0.15 ∙ 2200  222
              Torque (Nm)                                        =     10000          ∙    ∙ 1 ∙1 = 20 Nm


                                                                                  8
                                                                           D
                          D 2
              Mc =  f ∙ k c    8                                 Ff = 0.63 ∙    ∙f ∙ Kc ∙ sin k
                         ∙    ∙ sin k∙km
                      1000


                                                                            2
                                                                        22
                                                                 = 0.63 ∙    ∙ 0.15 ∙ 2200 ∙ 1 ∙1 = 2286 n
                                                                              2

              Feed Force (approx.) (N)
                        D                                             L+h   25+10
              Ff = 0.63 ∙   ∙ f∙kc∙sin k∙kf                      Tc =       =    434    = 0.08 min/piece
                         2




                                                                         V f
                                                                                50 ∙ 0.08
              Machining Time (min/piece)                         Cc =  CMh   ∙ Tc =        60



                                                                           60
              Tc =  L+h                                          = 0.067 $/piece
                         v f
              Machining Cost ($/piece)                           kc Values
                                                                   Material   kc Value    Material   kc Value
              Cc =  C Mh   ∙Tc                                     Group                  Group


                      60
                                                                     1        2000          19         900
                                                                     2        2100          20       1000
                f   Feed/rev mm/rev                                  3        2150          21         500
                kc  Material specific cutting force N/mm 2           4        2200          22         800
                    Distance from drill point to workpiece
                h                                                    5        2200          23         800
                    before feeding mm                                6        2100          26         700
                L   Depth of hole mm                                 7        2100          27         700
               CMh  Cost/machine hour $/h                            8        2100          28       1700
                η   Machine efficiency  %                            9        2100          31       3000
                k   90º  }180° bottom drills                         10       2500          32       3100
               sin k  1 DR...                                        11       3250          33       3300
                k   70º  }140° point angle drills                    12       2300          34       3300
               sin k  0.94                                           13       2800          35       3200
                                                                     14       2600          36       1700
                             Drill Geometry Coeficient               15       1100          37       1700
                        DCM          DCN         SCD                 16       1300          38       4600
                km        1          0.85        0.85                17       1100          39       4700
                kf1      0.85        0.85                            18       1800          40       4600
                                                                                            41       4500
   184    ISCAR
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