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. 20 495
f s f s f s f s f s f s f s f s f s f s
7 30 7 30 7 25 15 7 15 6 15 5 15 5 15 5 15 5 15 5
4 85 4 85 4 70 8 30 8 25 8 20 8 20 8 30 8 25 8 25
7 325
4 565
7 465
4 720
39 140
20 220
39 195 39 185 39 175 39 295 39 200 39 190 39 175 39 295 39 200 39 190
20 365 20 350 20 330 20 475 20 320 20 305 20 280 20 475 20 320 20 305
39 170
20 350
39 245
150-200 115
Free-machining alloy steels (Leaded): 41L30, 41L40, 41L47, 41L50, 43L47, 51L32, 52L100, 86L20, 86L40
200-250 250-300 300-375 375-425 175-225 225-275 275-325 325-375 375-425
95 70 50 40 90 60 50 40 25
7 210 15 105
4 435 8 270 8 175 8 170 8 155 8 270 8 175 8 170
7 300 15 220
4 560 8 450 8 255 8 240 8 225 8 450 8 255 8 240
39 90
20 170
39 90
20 235 20 305 20 210
39 135 39 265 39 115
20 325 20 495 20 290
125-175 100
39 135
Alloy steels: 4012, 4023, 4024, 4028, 4118, 4320, 4419, 4422, 4427, 4615, 4620, 4621, 4626, 4718, 4720, 4815, 4817, 4820, 5015, 5117, 5120, 6118, 8115, 8615, 8617, 8620, 8622, 8625, 8627, 8720, 8822, 94B17 Alloy steels: 1330, 1335, 1340, 1345, 4032, 4037, 4042, 4047, 4130, 4135, 4137, 4140, 4142, 4145, 4147, 4150, 4161, 4337, 4340, 50B44, 50B46, 50B50, 50B60, 5130, 5132, 5140, 5145, 5147, 5150, 5160, 51B60, 6150, 81B45, 8630, 8635, 8637, 8640, 8642, 8645, 8650, 8655, 8660, 8740, 9254, 9255, 9260, 9262, 94B30 E51100, E52100: use (HSS speeds)
15 50 15 45 15 40
15 85 15 80 15 75
39 70
15 105
15 220
39 135
20 305 20 210
39 265 39 115
20 495 20 290
175-225 75 (65)
15 85 15 80
39 70
15 50 15 45
225-275
60
275-325 50 (40) 325-375 35 (30)
f s
15 5
8 20
15 40
8 155
15 75
8 225
39 175
20 280
375-425
20
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