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DRILLING | Opening Drill® Large Diameter Replaceable IC Insert Drilling System
Formulas and Constants | Metric (mm)
A
Material Constants
Formulas
DRILLING
1. RPM
= (318.31 • M/min) / DIA F
where: RPM = revolutions per minute (rev/min) M/min = speed (M/min) DIA F = finish diameter of drill (mm)
Type of Material
Hardness (BHN)
K m (kPa)
100 - 250 85 - 275 125 - 325 125 - 375 225 - 400 100 - 350 150 - 250 140 - 310 140 - 310 185 - 350 185 - 350 135 - 275 135 - 275 400 - 600 300 - 500 120 - 320 120 - 320 30 - 180 30 - 180 100 - 250
5.17 5.86 6.21 6.90 7.93 6.90 6.21 9.93 4.97 4.48 7.45 6.48 6.48 9.66 4.48 5.17 2.76 2.76 3.45 2.41 2.07
Free-Machining Steel
Low-Carbon Steel
2. kW = ((DIA F
2 - DIA
P 2 ) • mm/rev • RPM • K
m ) / 205,154
Medium-Carbon Steel
where: kW
Alloy Steel
= tool power (kW)
B
High-Strength Steel
DIA F DIA P
= finish diameter of drill (mm) = pre-drill diameter (mm)
Structural Steel
mm/rev = feed rate (mm/rev) RPM = revolutions per minute (rev/min) K m = specific cutting energy (kPa)
Tool Steel
BORING
High-Temperature Alloy
machine efficiency (using 205,154 as constant)
Titanium Alloy Aerospace Alloy
3. Thrust
= 148.78 • mm/rev • (DIA F - DIA P ) • K m
Stainless Steel 400 Series Stainless Steel 300 Series Super Duplex Stainless Steel
where: Thrust
= axial thrust (N)
IPR
= feed rate (mm/rev)
DIA F DIA P
= finish diameter of drill (mm)
C
Wear Plate
11.04
= predrill diameter (mm)
K m
= specific cutting energy (kPa)
Hardened Steel
REAMING
Nodular, Ductile Cast Iron
4. Torque
= (kW • 9549.3) / RPM
Grey Cast Iron Cast Aluminum
where: Torque
= torque (Nm)
kW = tool power (kW) RPM = revolutions per minute (rev/min)
Wrought Aluminum Aluminum Bronze
The table and equations on this page are found in the Machinery’s Handbook . Permission to simplify and print the equations is granted by the Editor of the Machinery’s Handbook .
Brass
100
Copper
60
D
BURNISHING
E
THREADING
X
SPECIALS
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