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DRILLING | Opening Drill® Large Diameter Replaceable IC Insert Drilling System
Opening Drill®: Formulas and Constants | Metric (mm)
XTP TAP TAS HPU APX 4TX REV OPN SSD ACP BTA WHL CRT ALV BRN THM
Material Constants
Formulas 1. RPM = (318.31 • M/min) / DIA F where: RPM
= revolutions per minute (rev/min)
Type of Material
Hardness (BHN)
K m (kPa)
M/min
= speed (M/min)
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
DIA F
= finish diameter of drill (mm)
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)
High-Strength Steel
DIA F DIA P
= finish diameter of drill (mm) = pre-drill diameter (mm)
Structural Steel
mm/rev
= feed rate (mm/rev)
Tool Steel
RPM
= revolutions per minute (rev/min)
High-Temperature Alloy
K m
= specific cutting energy (kPa) 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)
Wear Plate
11.04
= predrill diameter (mm)
K m
= specific cutting energy (kPa)
Hardened Steel
Nodular, Ductile Cast Iron
4. Torque
= (kW • 9549.3) / RPM
Grey Cast Iron Cast Aluminum
where: Torque
= torque (Nm)
kW
= tool power (kW)
Wrought Aluminum Aluminum Bronze
RPM
= revolutions per minute (rev/min)
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
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