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Solid Carbide Boring Bar Feed and Speed Chart

Material HB/Rc Speed (SFM) Cutting Conditions
Feed IPR Tool Diameter
Uncoated ALTiN+ .015-.045 .050-.100 .110-.160 .180-.230 .290-.320 .360+
Max Doc Max Doc Max Doc Max Doc Max Doc Max Doc
Cast Iron 160 HB 75-200 200-550 .0005-.010 0.006 0.008 0.010 0.014 0.020 0.031
Carbon Steel 18 Rc 75-200 200-450 .0005-.007 0.003 0.005 0.006 0.008 0.012 0.017
Alloy Steel 20 Rc 75-200 200-425 .0005-.007 0.003 0.004 0.005 0.007 0.010 0.015
Tool Steel 25 Rc 75-175 175-300 .0005-.005 0.002 0.003 0.004 0.006 0.008 0.012
300 Stainless Steel 150 HB 75-175 175-350 .0005-.005 0.003 0.003 0.004 0.006 0.008 0.013
400 Stainless Steel 195 HB 75-210 130-420 .0005-.005 0.002 0.003 0.004 0.006 0.008 0.012
High Temp Alloy
Ni & Co Base
20 Rc 50-130 130-300 .0005-.004 0.002 0.003 0.003 0.005 0.007 0.010
Titanium 25 Rc 50-120 120-275 .0005-.005 0.003 0.004 0.005 0.006 0.009 0.014
Heat Treated Alloys
(38-45 Rc)
40 Rc 50-100 100-200 .0005-.005 0.002 0.002 0.003 0.004 0.006 0.009
Aluminum 100 HB 75-250 250-750 .0005-.015 0.011 0.015 0.019 0.026 0.038 0.056
Brass, Zinc 80 HB 75-300 250-650 .001-.010 0.009 0.012 0.015 0.021 0.030 0.045

SFM = Surface Feet per Minute
DOC = Depth Of Cut
IPR = Inches Per Revolution

Starting parameters only. Length-to-diameter ratios, setup, and machine rigidity may affect performance.

SFM = .262 x DIAMETER x RPM
RPM = 3.82 x SFM ÷ DIAMETER
IPM = FPT x Number of Teeth x RPM

Meters/Min = SFM x .3048
Millimeters/Rev = IPR x 25.40