Technical Guidance Basics of Drilling, Drilling Edition
■ Reference of Power Requirements and Thrust
12,000
8
f =.012
10,000
f : Feed rate (IPR)
f =.012
6
8,000
f =.008
f =.008
4
6,000
f =.004
4,000
f =.004
2
2,000
Part material: Medium Carbon Steel (220HB)
0
0
N
.4
.8
1.2
1.6
.4
.8
1.2
1.6
Drill diameter (DC) (inch)
Drill diameter (DC) (inch)
■ Cutting Condition Selection ● Control cutting force for low-rigidity machines
The following table shows the relation between edge treatment width and cutting force. If the cutting force is too great and causes issues, take measures such as reducing the feed rate or reducing the cutting edge treatment of the drill.
Drill Diameter : ø.394” Part material : Carbon Steel (230HB)
Edge treatment width
Cutting Conditions
.0059”
.0019”
v c (SFM)
f (IPR)
Torque (N/m)
Thrust (N)
Torque (N/m)
Thrust (N)
130
.015
12.8
2,820
12.0
2,520
.012
10.8
2,520
9.4
1,920
165
.009
9.2
2,320
7.6
1,640
200
.006
6.4
1,640
5.2
1,100
200
● High speed machining recommendation
If the machine has enough power and sufficient rigidity, reasonable tool life can be ensured even when adopting higher efficiency machining; however, sufficient coolant must be supplied.
Wear example
↓
↑
↓
v c = 200 SFM
v c = 400 SFM
Part material
: Carbon Steel (230HB)
Cutting conditions: f = .0118 IPR H=1.969” Tool life
: 600 holes (Cutting length: 1.181”)
■ Explanation of Margins (Difference between single and double margins) ● Single Margin (2 guides: ○ part)
● Double Margin (4 guides: ○ part)
● 4-point guiding reduces hole bending and undulation for improved stability and accuracy during deep hole drilling.
● Shape used on most drills
N61
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