Table 11. Cutting Speeds and Feeds for Milling Plain Carbon and Alloy Steels Table 11. (Continued) Cutting Speeds and Feeds for Milling Plain Carbon and Alloy Steels
End Milling
Face Milling
Slit Milling
HSS
HSS
Uncoated Carbide Coated Carbide Uncoated Carbide Coated Carbide Uncoated Carbide Coated Carbide
Brinell Hardness Number a
f = feed (0.001 in/tooth), s = speed (ft/min) Metric Units: f 3 25.4 = mm/rev, s 3 0.3048 = m/min
Speed (fpm)
Material
Opt. Avg. Opt.
Avg. Opt.
Avg. Opt.
Avg. Opt.
Avg. Opt.
Avg. Opt.
Avg.
f s f s
7 35 7 30
4 100
39 215 39 185
20 405 20 350
125-175 100
175-225 225-275 275-325 325-375 375-425 125-175 175-225 225-275 275-325 325-375 375-425
85 70 55 35 25 90 75 60 45 30 15
4 85
Plain carbon steels: 1027, 1030, 1033, 1035, 1036, 1037, 1038, 1039, 1040, 1041, 1042, 1043, 1045, 1046, 1048, 1049, 1050, 1052, 1524, 1526, 1527, 1541
f s
7 25
4 70
7 210
4 435
7 300
4 560
39 90
20 170
39 175
20 330
39 90
20 235
39 135
20 325
7 30 7 30
4 85 4 85
7 325
4 565
7 465
4 720
39 140
20 220
39 195 39 185
20 365 20 350
39 170
20 350
39 245
20 495
f s f s
Plain carbon steels: 1055, 1060, 1064, 1065, 1070, 1074, 1078, 1080, 1084, 1086, 1090, 1095, 1548, 1551, 1552, 1561, 1566
f s
7 25
4 70
7 210
4 435
7 300
4 560
39 90
20 170
39 175
20 330
39 90
20 235
39 135
20 325
175-200 100
15 7 15 6 15 5
8 30 8 25 8 20
15 105
8 270 8 175 8 155
15 270
8 450 8 255 8 225
39 295 39 200 39 175
20 475 20 320 20 280
39 135
20 305 20 210
7 25 7 25
4 70 4 70
f s f s f s
200-250
90
Free-machining alloy steels (Resulfurized): 4140, 4150
15 50 15 40
15 85 15 75
39 70
250-300
60
300-375 375-425
45 35
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