Technical Information
Drilling General Recommendation
● Cutting speed
● Horse power
π * Dc * n
Pmot
Vc =
(m/min)
Hp =
1000
0.75
Vc:Cutting speed(m/min) π:≈3.14 Dc:Drill diameter(mm)
Hp:Horsepowe
Pmot:Cutting power(KW)
n:Spindle speed(rev/min)
● Spindle speed
● Power demand
1000 * Vc
n =
(rev/min)
Φ Dc
π * Dc
Q * Kc 60000 * η
Vc:Cutting speed(m/min) π: ≈3.14 Dc:Drill diameter(mm)
Pmot =
(KW)
n:Spindle speed(rev/min)
Pmot:Cutting power(KW)
Q:Chip removal(cm³/min)
● Feed speed
Kc:Unit cutting force(N/mm²) η:Machine efficiency coefficient (0.7-0.95)
Vf = fz * n * Z (mm/min)
● Torque
Vf:Feed speed(mm/min) n:Spindle speed(rev/min)
fz:Feed per tooth(mm/z)
Z:Number of teeth
Dc 2 * Kc * f
Mc =
(N*m)
8000
● Feed rate per rev.
Mc:Torque Dc:Drill diameter(mm) Kc:Unit cutting force(N/mm²) f:Feed rate per rev.(mm/rev)
Vf
fz =
(mm/z)
n * Z
fz:Feed per tooth(mm/z) Vf:Feed speed(mm/min) n:Spindle speed(rev/min) Z:Number of teeth
● Feed force
f * Dc * Kc
● Feed rate per rev.
f
Ff = 0.63 *
(N)
2
Vf
Ff:Feed force
f:Feed rate per rev.(mm/rev) Kc:Unit cutting force(N/mm²)
f =
(mm/rev)
Dc:Drill diameter(mm)
n
f:Feed rate per rev.(mm/rev)
Vf:Feed
speed(mm/min)n:Spindle speed(rev/min)
● Cutting thickness
● Chip removal
Vf * π * Dc 2
h = fz * sink (mm)
(cm 3 /min)
Q =
4 * 1000
h:Cutting thickness(mm)
fz:Feed rate(mm/rev)
Q:Chip removal(cm³/min) Vf:Feed speed(mm/min) π:≈3.14 Dc:Drill diameter(mm)
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