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  • Formula for Drilling

    Cutting speed (vc)
    formulae
    *Divide by 1,000 to change to m from mm.
    vc (m/min) : Cutting Speed
    DC (mm) : Drill Diameter
    π (3.14) : Pi
    n (min-1) : Main Axis Spindle Speed
    Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
    n(min-1)
    DC(mm)
    vc(m/min)


    figure
    (Problem)
    What is the cutting speed when main axis spindle speed is 1350min-1 and drill diameter is 12mm ?
    (Answer)
    Substitute π=3.14, DC=12, n=1350 into the formula
    vc=π×DC×n÷1000=3.14×12×1350=50.9m/min
    The cutting speed is 50.9m/min.


    Feed of the main spindle (vf)
    formulae
    vf(mm/min):Feed Speed of the Main Spindle (Z axis)
    fr(mm/rev):Feed per Revolution
    n(min-1) :Main Axis Spindle Speed
    Check the item you want to calculate, input values in the two boxes, and then press the Calculate button.
    fr(mm/rev)
    n(min-1)
    vf(mm/min)


    image
    (Problem)
    What is the spindle feed (vf) when the feed per revolution is 0.2mm/rev and main axis spindle speed is 1350min-1 ? (Answer)
    Substitute fr=0.2,n=1350 into the formula
    vf=fr×n=0.2×1350=270mm/min
    The spindle feed is 270mm/min.


    Drilling time (Tc)
    formulae
    Tc (min) : Drilling Time
    n (min-1) : Spindle Speed
    ld (mm) : Hole Depth
    fr (mm/rev): Feed per Revolution
    i : Number of Holes
    Input the values
    ld(mm)
    i
    n(min-1)
    fr(mm/rev)

    Tc(min)
    sec.

    figure
    (Problem)
    What is the drilling time required for drilling a 30mm length hole in alloy steel (JIS SCM440) at a cutting speed of 50m/min and a feed 0.15mm/rev ?

    (Answer)
    n=(50×1000)÷(15×3.14)=1061.57min-1
    Tc=(30×1)÷(1061.57×0.15)=0.188
    =0.188×60≒11.3sec

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