Page 575 - Ceratizit Catalog
P. 575

Formula collection
                                                                                                                   B248
                                                                                       Formulas - helical milling




                                                              Helical milling - external
         Feed rate (speed at centre of milling cutter)
                                                              Calculation example:

                 d 1
         v f =  (1+  )n·f ·z
                        z
                 D w                                          Cutter type: ... C210.25.R.04
                                                              Cutter diameter d : ... 25 mm
                                                                           1
                                                              Number of teeth z: ... 4
                                                              Machined diameter D : ... 45 mm
                                                                               w
                                                              Blank diameter D : ... 50 mm
         Actual depth of cut                                               a
                                                              Rev number n: ... 2500 rpm
                  2   2                                       Feed per tooth f : ...  0.05 mm
                  a
                D- D w                                                    z
         a e =
              4   (D+ d)
                       1
                   w
                                                              Feed rate:
                                                                      25
                           a e
                                                              v f =  (1+  ) 2500   0,05   4 = 777 mm/min
                                                                      45
                   f Z
                  ∼
                                              D w
                                                              Radial depth of cut:
                                                              (50- 45)/2= 2,5 mm
             n
                                                              Effective radial depth of cut:
                                               D a
                                                                       2
                                                                     50 -45 2
                                                              a e =            = 1,7 mm
                    V f
                                                                  4   (45+ 25)
                                                              Helical milling - internal
         Feed rate (speed at centre of milling cutter)
                                                              Calculation example:
                 d 1
          v f =  (1-  )n·f ·z
                         z
                 D w                                          Cutter type: ... C210.25.R.04
                                                              Milling cutter diameter d : ... 25 mm
                                                                                 1
                                                              Number of teeth z: ... 4
                                                              Machined diameter D : ... 50 mm
                                                                               w
                                                              Blank diameter D : ... 45 mm
         Actual depth of cut                                               a
                                                              Rev number n: ... 2500 rpm
                  2   2                                       Feed per tooth f : ...  0.05 mm
                  w
                D- D a                                                    z
         a e =
              4   (D+ d)
                   w
                       1
                                                              Feed rate:
                                                                     25
                                                              v f =  (1-  ) 2500   0,05   4 = 250 mm/min
                                       a e                           50
                                n
                                                              Radial depth of cut:
                                                                                                                     Milling / Technical information
                                                              (50- 45)/2= 2,5 mm
                           D a
                       v f
                           D W
                                                              Effective radial depth of cut:
                                                                       2
                                                                    50 -45 2
                             ∼ f Z                            a e =            = 4,75 mm
                                                                  4   (50- 25)
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