Page 39 - ISCARs-solutions-for-Heavy-Machining-2022

General - Calculations

Metric: Inch:
-1
Spindle Speed (min ) Spindle Speed (sfm)
vc ∙1000 vc ∙12
n= π ∙ D n= π D
∙

Cutting Speed (m/min) Cutting Speed (rpm)
π ∙ D ∙ n π ∙ D ∙ n
vc = 1000 vc = 12

Table Feed (mm/min) Table Feed (ipm)

vf = f ∙ n
vf = fz ∙ Z ∙ N
3
Material Removal Rate (cm /min)
Material Removal Rate (in3/min)
vf ∙ π ∙ D 2
Q= 4000 vf ∙ π ∙ D 2

Q=
4
Power Requirement (kW)
Power Requirement (hp)

Q
Pc = 60.000 ∙ η ∙ kc ∙ sin k Q
Pc =
396 ∙ η ∙ kc

Torque (Nm)
Torque (lbf/in)
D
2
Mc = f ∙ kc ∙ ∙ sin k∙km D 2
1000 8 Mc = f ∙ kc ∙ ∙ sin k

1000
8
Feed Force (approx.) (N)
Feed Force (approx.) (lbf)
D
Ff = 0.63 ∙ ∙ f∙kc∙sin k∙kf D
2 Ff = 700 ∙ ∙ f∙kc∙sin k
2
Machining Time (min/piece)
Machining Time (min/piece)
Tc = L+h L+h
vf Tc =
vf
Machining Cost ($/piece)
Machining Cost ($/piece)
Cc = CMh ∙Tc Cc = CMh ∙Tc

60
60

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