Feed Force [kN]Feed Force [kN]Feed Force [kN] Indexable Drills Feed Force Requirement Feed Force Requirement Steel 4140 10 9 8 7 f = 0.25 6 f = 0.20 5 4 3 f = 0.16 2 f = 0.12 1 0 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 Drill Diameter D1 (mm) Stainless Steel 304 10 f = 0.20 9 8 f = 0.18 7 6 f = 0.15 5 4 3 f = 0.12 2 1 0 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 Drill Diameter D1 (mm) Cast Iron GG25 10 9 8 7 6 f = 0.25 5 4 f = 0.20 3 f = 0.16 2 f = 0.12 1 0 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 Drill Diameter D1 (mm) V38 widia.com