BORING BARS BORING BARS RECOMMENDED CUTTING CONDITIONS (inch) Case 1 Case 2 Heavy Metal Shank L/D ≤ 3 3 < L/D ≤ 4 Steel Shank L/D ≤ 3 3 < L/D ≤ 4 Carbide Shank L/D ≤ 5 5 < L/D ≤ 8 Work Material Hardness Cutting Mode vc(SFM) f(IPR) ap vc f(SFM)(IPR) ap P Carbon SteelAlloy Steel Light Cutting 295 ─ 525 .002 ─ .006 .008 260 ─ 490 .002 ─ .006 .008180 ─ 280 HBMedium Cutting195 ─ 395.006 ─ .014.118165 ─ 360.004 ─ .008.059 M Light Cutting 330 ─ 590 .002 ─ .006 .008 330 ─ 590 .002 ─ .006 .008 Stainless Steel ≤ 200 HB Medium Cutting 165 ─ 295 .006 ─ .010 .079 130 ─ 260 .004 ─ .008 .039 K Tensile Strength Light Cutting 295 ─ 525 .002 ─ .006 .020 330 ─ 590 .004 ─ .006 .020 Cast Iron ≤ 350 MPa Medium Cutting 195 ─ 390 .006 ─ .010 .079 130 ─ 260 .006 ─ .010 .060 E N Light Cutting 655 ─ 1310 .002 ─ .006 .008 665 ─ 1310 .002 ─ .006 .008 Aluminum Alloy ─ Medium Cutting 490 ─ 820 .002 ─ .006 .079 490 ─ 820 .002 ─ .006 .059 E048