Hole machining
Recommended Cutting Speed for Materials(Dia ≥63.50mm)
Grade
Feed fn mm/r
Brinell hardness (HB)
Cutting speed Vc m/min
Workpiece material
Insert
Drilling dia mm
P
I
C
≥63.50 0.18-0.35 0.18-0.35 0.18-0.35 0.18-0.35 0.18-0.35 0.16-0.35 0.18-0.30 0.18-0.30 0.16-0.30 0.16-0.30 0.15-0.30 0.15-0.30 0.16-0.35 0.16-0.35
C=0.05-0.10% C=0.10-0.25% C=0.25-0.55% C=0.55-0.80%
125 125 150 170 210 180 275 350 200 325 180 200 200 200 300 230 200 260 180 245 160 250 230
80-100 80-100 80-100 80-100 70-100 60-100 70-100 70-100 60-100 60-100 50-100 50-100
Unalloyed steel
AP301U(N)
High carbon steel
Carbon tool steel Non-Hardened
AP301U(N)
P
Low-alloyed steel
Tempered Tempered Annealed
AP301U(N)
High-alloyed steel
AP301U(N)
Hardened tool steel Non-alloyed steel Low-alloy （ alloy<5%)
Cast steel
AP301U(N)
Non-Hardened/Ferritic/martensitic
50-90 50-90
Austenitic
M
Stainless steel
AP301U(N)
Austenitic, precipitation hardened (PH)
Austenitic/ferritic, duplex
Ferritic Pearlitic
Malleable cast iron
AP301U(N)
Low tensile strength High tensile strength
Grey cast iron
AP301U(N)
K
Ferritic Pearlitic
Nodular cast iron
AP301U(N)
GGV (CGI)
non-aging
30
65-130 65-130 65-130 65-130 65-130 65-130 65-130 65-130 65-130
0.10-0.30 0.10-0.30 0.10-0.30 0.10-0.30 0.10-0.30 0.10-0.30 0.10-0.30 0.10-0.30 0.10-0.30 0.15-0.30 0.15-0.30 0.15-0.30 0.15-0.30 0.15-0.30 0.15-0.30 0.15-0.30 0.15-0.30
Wrought aluminium alloys
AP301U(N)
aged
100
≤ 12% Si, non-aging
75 90
Cast aluminium alloys
≤ 12% Si, aged
AP301U(N)
> 12% Si, non-aging
130
N
Magnesium alloy
70
Unalloyed, electrolytic copper Brass, bronze, red brass Cu alloys, short-chip High tensile, Ampco alloy
100
AP301U(N)
90
Copper and copper alloys (bronze/brass)
110 300 200 280 250 350 320 200 375 375 410
AP301U(N)
Fe-based annealed Fe-based hardened
20-65 20-65 20-65 20-65
Ni or Co-based annealed Ni or Co-based hardened
Heat-resistant alloys
AP301U(N)
Ni or Co-based cast
S
Pure titanium
30-100 30-100 30-100 30-100
α alloys
Titanium alloys
AP301U(N)
α and β alloys
β alloys
Hardened steel Chilled cast iron
Hardened and tempered
43-47 HRC 47-60 HRC
H
*) Insert position-P , I , C P=peripheral insert , I=intermediate insert, C=center insert
366
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