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 Engineering Formulae
  Surface Speeds for H.S.S. and Carbides Tools
 

 

Surface Speeds (ft/min) for H.S.S. Tools

Material Cutting Rake Surface Speed, H.S.S.
H.S.S. Turn Bore Part-Off Form Drill Screw Die Tap Screw Cut Single Point Mill
A 5 100 80 67 18 40 70-85
B 5 130 110 85 25 45 70-110
C 20-30 550 420 280 55 95 300-1400
D 15-25 400 310 250 50 90 300-1400
E 0-5 280 220 180 50 90 200-300
F 0-5 230 180 140 40 75 140-200
G 8-10 200 160 110 30 50 110-140
H, K 5 150 120 90 25 50 80-110
L 5 125 95 75 20 40 55-75
M 5 125 95 75 20 40 55-75
N 5 100 80 65 20 35 45-60
P 5 85 65 60 18 30 22-32

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Surface Speeds (ft/min) for Carbides, Feed (in./rev.) for Carbides Tools

 

Material Cutting Rake Surface Speed, Carbides Feed Carbides
Carbide Turn Face Bore Part-Off Mill Rough Turn Finish Turn
Rough Finish Rough Finish
A 3 300 400 200 350 175-210 0.060 0.008
B 3 250 400 180 250 175-260 0.060 0.010
C 8-15 Unlimited 0.030 0.005
D 8-15 0.030 0.005
E 3 1000 1500 300 1200 480-750 0.030 0.015
F 0-3 600 1000 400 600 350-500 0.080 0.012
G 8 750 1000 500 750 260-350 0.040 0.008
H, K 3 700 850 450 600 210-260 0.060 0.010
L 0-3 400 550 300 400 150-190 0.020 0.008
M -4- -2 300 400 200 300 140-175 0.020 0.008
N -2 220 250 150 150 110-145 0.015 0.005
P 8 Up to 100 0.015 0.005

 

Some manufacturers recommend milling at turning speeds. Correct carbide grade must be used.

Material Code

A= Malleable Iron, B= Cast Iron, C=Magnesium alloys, D= Aluminum light alloys, E= Soft Brass, F= Hard brass, G= Low Carbon steel (up to 0.3 per cent C), H= Medium carbon steel (0.3-0.6 percent C), K = Phosphor bronze, L= 40-60 ton alloy steel, M= High carbon Steel (above 0.6 per cent C), N= Nickel chrome Steel (100 ton), P= Stainless Steel

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