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  • Formulae for Face Milling

    Cutting Speed(vc)
    計算式
    *Divide by 1000 to change to m from mm.
    DC(mm);Cutter Diameter
    π(3.14):Pi
    n(min-1):Main Axis Spindle Speed

    vc(m/min):Cutting Speed
    Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
    DC(mm)
    n(min-1)
    vc(m/min)


    image
    (Problem)
    What is the cutting speed when main axis spindle speed is 350min-1 and the cutter diameter is ø125 ?
    (Answer)
    Substitute π=3.14, DC=125, n=350 into the formula.
    vc=(π•DC•n)÷1000=(3.14×125×350)÷1000
    =137.4m/min

    The cutting speed is 137.4m/min.


    Feed Per Tooth(fz)
    FORMULAE
    vf(mm/min):
    Table Feed per Min.

    z:Insert Number
    n(min-1):
    Main Axis Spindle Speed (Feed per Revolution f=z
    xfz)
    fz(mm/t.):Feed per Tooth
    Check the item you want to calculate, input values in the three boxes, and then press the Calculate button.
    vf(mm/min)
    z
    n(min-1)
    fz(mm/t.)


    image
    (Problem)
    What is the feed per tooth when the main axis spindle speed is 500min-1, number of insert is 10, and table feed is 500mm/min?
    (Answer)
    Substitute the above figures into the formula.
    fz=Vf÷(z×n)=500÷(10×500)=0.1mm/t.
    The answer is 0.1mm/t.


    Table Feed(vf)
    FORMULAE
    vf(mm/min): Table Feed per Min.
    z:Insert Number
    n(min-1): Main Axis Spindle Speed
    fz(mm/t.):Feed per Tooth

    image
    (Problem)
    What is the table feed when feed per tooth is 0.1mm/t., number of insert is 10, and main axis spindle speed is 500min-1?
    (Answer)
    Substitute the above figures into the formula.
    vf=fz×z×n=0.1×10×500=500mm/min
    The table feed is 500mm/min.


    Cutting Time(Tc)
    FORMULAE
    L(mm):Total Table Feed Length (Workpiece Length: (l)+Cutter Diameter:DC))
    vf(mm/min):Table Feed per Min.
    Tc(min):Cutting Time
    Input the values. L(mm) vf(mm/min)

    Tc(min)
    sec

    image
    (Problem)
    What is the cutting time required for finishing 100mm width and 300mm length surface of a cast iron (JIS FC200) block when the cutter diameter is ø200mm, the number of inserts is 16, the cutting speed is 125m/min, and feed per tooth is 0.25mm. (spindle speed is 200min-1
    (Answer)
    Calculate table feed per min
    vf=0.25×16×200=800mm/min

    Calculate total table feed length.
    L=300+200=500mm

    Substitute the above answers into the formula.
    Tc=500÷800=0.625(min)

    0.625×60=37.5(sec). The answer is 37.5 sec.

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