Page 427 - THREADING CATALOG
P. 427
USER GUIDE
General - Calculations - Metric
-1
Spindle Speed (min ) F = feed/rev mm/rev
Kc = material specific cutting force N/mm 2 THREAD DRILLING
v c ∙1000 H = point to workpiece before feeding mm
n=
π ∙ D D = diameter of hole mm
Cutting Speed (m/min) L = depth of hole mm
CMh = cost/machine hour $/h
Η = machine efficiency %
π ∙ D ∙ n
vc =
1000 K = 90º } 180° bottom drills
Sin k = 1 DR...
Table Feed (mm/min)
K = 70º } 140° point angle drills
vf = f ∙ n Sin k = 0.94 SCD.., DCM.., DCN..
Material Removal Rate (cm /min)
3
Q= v f ∙ π ∙ D 2
4000
Power Requirement (kW)
Q
Pc = ∙ kc
60.000 ∙ η
Torque (Nm)
Mc = f ∙ k c ∙ D 2
1000 8
Feed Force (approx.) (N)
D
Ff = 0.7 ∙ ∙ f∙kc∙sin k
2
Machining Time (min/piece)
L+h
Tc =
vf
Machining Cost ($/piece)
Cc = C Mh ∙Tc
60
425
