Cleveland Twist Drill Q Cobalt Drills

Starting Speed & Feed Recommendations

The speeds & feeds listed here are conservative recommendations for initial setup. In actual use, depending on the machine environment and workpiece material, significantly higher speeds & feeds may be achievable. Using these speeds & feeds as a starting point, cutting conditions can be gradually adjusted until the optimum settings for the application are found. Questions? Contact Cleveland technical support at 888-434-8665.

  Surface Feet/Minute Inches/Revolution
Uncoated, TiN coated, and TiAlN coated TiCN Coated
Material Hardness Uncoated TiN Coated TiCN Coated TiAlN Coated 1/8" 1/4" 3/8" 1/2" 1/8" 1/4" 3/8" 1/2"
FERROUS
Low Carbon Steel 85 - 125 Bhn 100 130 145 .004" .0065" .008" .010" .005" .008" .010" .0125"
Medium Carbon Steel 125 - 175 Bhn 95 125 140 175 .0049" .0065" .008" .010" .006" .008" .010" .0125"
High Carbon Steel 175 - 225 Bhn 90 120 130 160 .003" .005" .0065" .008" .0035" .006" .008" .010"
Alloyed Steel 200 - 300 Bhn 65 85 95 110 .0025" .004" .005" .0065" .003" .005" .006" .008"
Heat Treatable Steel & Forgings 370 - 420 Bhn 40 50 60 70 .0025" .004" .005" .0065" .003" .005" .006" .008"
Tool Steels <24 Rc 60 80 90 110 .003" .005" .0065" .008" .0035" .006" .008" .010"
Tool Steels >24 Rc 30 40 45 55 .0025" .004" .005" .0065" .003" .005" .006" .008"
High Speed Steels 14 - 30 Rc 35 50 55 60 .0025" .004" .005" .0065" .003" .005" .006" .008"
Grey Cast Iron 120 - 200 Bhn 115 160 175 205 .005" .008" .010" .0125" .006" .010" .0125" .0155"
Grey Cast Iron <350 Bhn 90 120 135 165 .005" .008" .010" .0125" .006" .010" .0125" .0155"
Malleable Cast Iron <300 Bhn 70 95 105 125 .005" .008" .010" .0125" .006" .010" .0125" .0155"
300 Series Stainess Austenetic 120 - 200 Bhn 60 80 90 110 .003" .005" .006" .0075" .0035" .006" .0075" .009"
400 Series Stainess Martensitic 200 - 300 Bhn 40 50 60 80 .0025" .004" .005" .0065" .003" .005" .006" .008"
Stainess - Sulpherized <25 Rc 50 70 75 90 .003" .005" .006" .0075" .0035" .006" .0075" .009"
PH Stainless Steel 300 - 375 Bhn 30 45 55 .0025" .004" .005" .0065" .003" .005" .006" .008"
Nickel Alloys 300 - 375 Bhn 20 30 45 .0025" .004" .005" .0065" .003" .005" .006" .008"
NON-FERROUS
Aluminum & Aluminum Alloys 40 - 100 Bhn 300 450 .006" .009" .011" .0135" .0075" .011" .0135" .0165"
Aluminum, Cast < 10% Silicon 200 Bhn 225 275 350 .005" .0075" .009" .011" .006" .009" .011" .0135"
Aluminum, Cast > 10% Silicon 200 Bhn 180 300 .004" .0065" .008" .010" .005" .008" .010" .0125"
Brass - Long Chipping 190 - 210 Bhn 140 190 210 .004" .0065" .008" .010" .005" .008" .010" .0125"
Bronze - Long Chipping 150 - 200 Bhn 90 130 160 .0035" .0055" .0075" .009" .004" .0065" .009" .011"
Copper - Low Alloy 65 - 100 Bhn 125 145 175 .004" .0065" .008" .010" .005" .008" .010" .0125"
Plastics - Duraplastics n/a 55 75 90 .0035" .0055" .0075" .009" .004" .0065" .009" .011"