Cutting Condition Chart # 5 - 4 Flute End Mills
Suggested Speeds and Feeds
Slotting (Fractional)
Work
Material
Aluminum
Cast Iron
Medium
Carbon Steel
Mild Steel
Pre-hardened,
Stainless Die
& Alloy Steels
Pre-hardened,
Stainless Die
& Alloy Steels
Hardened
Steels
Hardness
      
<HRC30
HRC30-40
HRC40-50
Depth
of Cut
slotting depth of cut    up to 1/32 Ad =0.2D
from 1/32 to 5/64 Ad= 0.3D
over 5/64 Ad=0.5D
Mill
Diameter
(inch)
V=330 SFM
V=100-150 SFM
V=100-130 SFM
V=65-100 SFM
V=65-82 SFM
V=43 SFM
Speed
Feed
Speed
Feed
Speed
Feed
Speed
Feed
Speed
Feed
Speed
Feed
RPM
IPM
RPM
IPM
RPM
IPM
RPM
IPM
RPM
IPM
RPM
IPM
.030
40000
11.0
16000
6.9
14000
3.5
8000
1.4
8000
0.8
6000
0.4
3/64
31500
11.0
14000
7.9
12500
4.1
7500
1.7
7000
0.8
4800
0.4
1/16
21200
11.0
9500
7.9
8500
4.9
6500
2.0
5000
1.1
3200
0.6
5/64
16000
16.5
7100
8.3
6300
5.5
5000
3.3
4000
1.7
2400
0.9
1/8
11200
16.5
4750
8.9
4250
5.5
3200
4.3
2600
1.7
1600
0.9
5/32
8000
16.5
3550
8.9
3150
5.5
2400
4.3
2000
1.7
1200
0.9
3/16
6300
16.5
2800
8.9
2500
5.5
2000
4.3
1600
1.7
950
0.9
1/4
5300
16.5
2360
11.0
2120
5.5
1600
4.3
1300
1.7
800
0.9
5/16
4000
16.5
1800
13.0
1600
5.5
1200
4.3
1000
1.7
600
0.9
3/8
3150
16.5
1400
13.0
1250
5.5
1000
4.3
800
1.7
480
0.9
1/2
2650
16.5
1180
13.0
1060
5.5
820
4.3
700
1.7
400
0.9
5/8
2000
16.5
900
13.0
800
5.5
640
4.7
500
2.0
300
0.7
3/4
1600
16.5
710
13.0
630
5.5
500
4.7
400
2.0
240
0.6
1
1250
16.5
560
13.0
500
5.5
400
4.7
320
2.0
190
0.4
 Cutting Condition Chart # 4 - 2 & 3 Flute End Mills
Suggested Speeds and Feeds
Slotting (Fractional)
Work
Material
Aluminum
Cast Iron
Medium
Carbon Steel
Mild Steel
Pre-hardened,
Stainless Die,
& Alloy Steels
Pre-hardened,
Stainless Die,
& Alloy Steels
Hardened
Steels
Hardness
 
 
 
<HRC30
HRC30-40
HRC40-50
Depth of
Cut
slotting depth of cut    up to 1/32 Ad =0.2D
from 1/32 to 5/64 Ad= 0.3D
over 5/64 Ad=0.5D
Mill
Diameter
(inch)
V=330 SFM
V=100-150 SFM
V=100-130 SFM
V=65-100 SFM
V=65-82 SFM
V=43 SFM
Speed
Feed
Speed
Feed
Speed
Feed
Speed
Feed
Speed
Feed
Speed
Feed
RPM
IPM
RPM
IPM
RPM
IPM
RPM
IPM
RPM
IPM
RPM
IPM
.015
100000
7.1
31500
3.9
30000
1.4
22400
0.7
21200
0.5
16000
0.3
.020
62000
7.9
22400
4.9
19000
1.6
13000
0.8
12000
0.6
9500
0.3
.030
40000
7.9
16000
4.9
14000
2.5
8000
1.0
8000
0.6
6000
0.3
3/64
31500
7.9
14000
5.5
12500
3.0
7500
1.2
7000
0.6
4800
0.3
1/16
21200
7.9
9500
5.5
8500
3.5
6500
1.4
5000
0.8
3200
0.4
5/64
16000
11.8
7100
5.9
6300
3.9
5000
2.4
4000
1.2
2400
0.6
1/8
11200
11.8
4750
6.3
4250
3.9
3200
3.1
2600
1.2
1600
0.6
5/32
8000
11.8
3550
6.3
3150
3.9
2400
3.1
2000
1.2
1200
0.6
3/16
6300
11.8
2800
6.3
2500
3.9
2000
3.1
1600
1.2
950
0.6
1/4
5300
11.8
2360
7.9
2120
3.9
1600
3.1
1300
1.2
800
0.6
5/16
4000
11.8
1800
9.3
1600
3.9
1200
3.1
1000
1.2
600
0.6
3/8
3150
11.8
1400
9.3
1250
3.9
1000
3.1
800
1.2
480
0.6
1/2
2650
11.8
1180
9.3
1060
3.9
820
3.1
700
1.2
400
0.6
5/8
2000
11.8
900
9.3
800
3.9
640
3.3
500
1.5
300
0.5
3/4
1600
11.8
710
9.3
630
3.9
500
3.3
400
1.5
240
0.4
1
1250
11.8
560
9.3
500
3.9
400
3.3
320
1.5
190
0.3

Microcut, Inc.
Easton Industrial Park
5 Hampden Drive
South Easton, MA 02375

TEL: 508-230-9389
FAX: 508-230-0389
Email: info@microcutUSA.com