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                                TECHNICAL DATA                               Для заказа - info@mitsubishitools.ru

                                FORMULAE FOR DRILLING

                                y CUTTING SPEED (vc)                         vc (m/min) : Cutting Speed  D1 (mm) : Drill Diameter
                                                                             ) (3.14) : Pi               n (min-1) : Rotational Speed of the Main Spindle
                                   vc = ) • D1• n (m/min)
                                               1000                          (Problem) What is the cutting speed when the main axis spindle speed is 1350min-1
                                                                                            and drill diameter is 12mm ?
                                  *Unit transformation (from "mm" to "m")
                                                                          n  (Answer) Substitute ) =3.14, D1=12, n=1350 into the formula

                                                                                   vc = ) •D1• n = 3.14121350 = 50.9m/min
                                                                                   1000                            1000

                                                                             The cutting speed is 50.9m/min.

                                D1

                                y FEED OF THE MAIN SPINDLE (vf)

DRILLING FORMULAE FOR DRILLING  vf = f• n (mm/min)                           vf (mm/min) : Feed Speed of the Main Spindle (Z axis)
                                                                             f (mm/rev) : Feed per Revolution
                                               vf n                          n (min-1) : Rotational Speed of the Main Spindle

                                                                             (Problem) What is the spindle feed (vf) when the feed per revolution is 0.2mm/rev
                                                                                            and the main axis spindle speed is 1350min-1 ?

                                                                             (Answer) Substitute f=0.2, n=1350 into the formula
                                                                                            vf = fn = 0.21350 = 270mm/min
                                                                                            The spindle feed is 270mm/min.

                                                 f

                                y DRILLING TIME (Tc)

                                                 Tc (min) : Drilling Time          (Problem) What is the drilling time required for drilling a 30mm
                                                 n (min-1) : Spindle Speed
                                Tc = Id •i       ld (mm) : Hole Depth                                    length hole in alloy steel at a cutting speed of 50m/min
                                         n•f     f (mm/rev) : Feed per Revolution                        and a feed 0.15mm/rev ?

                                                 i : Number of Holes               (Answer) Spindle Speed n = 501000 = 1061.57min-1
                                                                                                                               153.14

                                              n                                                                    Tc =       301     = 0.188
                                                                                                                         1061.570.15

                                                                                                                   = 0.18860i11.3 sec

                                                      ld

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