MACHINING: Turning, Facing, & Boring Tools Recommended: C-2 or Carboloy 883 Alloy Rough Machining Semirough Machining Semirough Machining DOC(in) IPR(in/rev) SFPM DOC(in) IPR(in/rev) SFPM DOC(in) IPR(in/rev) SFPM WT 6,50 0.25 0.003-0.006 40-50 0.125 0.004-0.008 50-60 0.005-0.025 0.006-0.012 70-90 WT 1,12 0.25 0.002-0.005 35-45 0.125 0.003-0.007 55-65 0.005-0.025 0.005-0.010 65-85 WT 3,19,60 0.25 0.002-0.004 35-45 0.125 0.003-0.005 55-65 0.005-0.025 0.003-0.007 65-85 WT 12 0.25 0.005-0.008 50-60 0.125 0.006-0.010 60-70 0.005-0.025 0.007-0.012 80-90 DOC: Depth of Cut     IPR: Inches per Revolution     SFPM: Surface Feet per Minute Note: for drilling use carbide tools GRINDING Grinding is recommended for alloys with hardnesses higher than RC 55. Alundum type of wheels are preferable. Grinding speeds of 2800-4000 ft/min are used depending on the alloy and parts. The use of coolants minimize surface cracks.