Technical Information
Turning Machining Formula ● Cutting speed
● Cutting force
n
Fc = Kc * ap * f (N)
Fc:Cutting force(N)
Kc:Unit cutting force(N/mm²)
ap:Axial depth of cut (mm) f:Feed rate(mm/rev)
π * Dc * n
Vc =
(m/min)
1000
● Cutting power
Vc:Cutting speed(m/min) π: ≈3.14 Dc:Workpiece diameter(mm) n:Spindle speed(rev/min)
Kc * Vc * ap * f
Pmot =
(KW)
60000 * η
Pmot:Cutting power(KW) Kc:Unit cutting force(N/mm²) Vc:Cutting speed(m/min) ap:Axial depth of cut (mm) f:Feed rate(mm/rev) η:Mechanical efficiency
● Feed speed
● Chip removal
Vf = f * n (mm/min)
Vf:Cutting speed(mm/min) n:Spindle speed(rev/min)
f:Feed rate(mm/rev)
Q = ap * f * Vc (cm 3 /min)
Q:Chip removal(cm³/min) ap:Axial depth of cut (mm) f:Feed rate(mm/rev) Vc:Cutting speed(m/min)
● Chip thickness
h = f * sinkr (mm)
● Theoretic surface roughness
Rmax
h:Chip thickness(mm)
f:Feed rate(mm/rev)
f
r
f 2
Rmax =
● Chip width
* 1000 (um)
8 * r
Rmax:Theoretic surface roughness (um) f:Feed rate(mm/rev)
ap
b =
(m/min)
r:Corner radius (mm)
sinkr
b:Chip width(mm)
ap:Axial depth of cut (mm)
● Work time
L
● Chip area
L
A = h * b = ap * f (mm 2 )
Tc =
(min)
f * n
A:Chip area(mm 2 ) f:Feed rate(mm/rev)
ap:Axial depth of cut (mm)
Tc:Work time f:Feed rate(mm/rev) n:Spindle speed(rev/min) L: Working length(mm)
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