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Drills Guide for Drill Selection and Use (Drill Recommendation):
The table below should be only taken as a general guide

MATERIAL TO BE CUT DRILL TYPE DRILL HELIX CUTTING SPEED RANGE POINT ANGLE (Degrees) LUBRICANT   FEED RATE meter/min feet/min STEELS, mild free cutting Standard   Standard   30 - 60   100 - 200   118   Soluble oil Heavy   STEELS,  low alloy carbon/tool steels Standard   Standard   15 - 40   50 - 130   118   Soluble oil Medium   STEELS,  Cr / Mo alloy, annealed HSS, ferritic stainless Standard / Heavy Duty Co Standard   5 - 16   15 - 50   118   Soluble oil Medium   STEELS, Cr / Ni alloy Austenitic stainless (1) Standard / Heavy duty Co Standard   4 - 12   12 - 40   135 Split / Notched Mineral oil Light   STEELS,  Mn alloy Rail, Armour, some spring steels Co, very heavy duty Slow   3 - 5   10 - 12   135 Split / Notched Dry (2)   Light   NIMONIC alloys Standard, Cobalt Fairly quick 3 - 8   10 - 26   135 Split Mineral oil Light   IRON, soft grey malleable Standard   Standard   20 - 80   60 - 100   118   Dry (2)   Heavy   IRON, hard cast (1) Standard / Cobalt Standard   10 - 20   30 - 65   90 or 118   Dry (2)   Medium   COPPER,  pure electrolytic, ductile alloys Standard   Quick   30 - 60   100 - 200   118 or 135   Mineral oil Heavy   COPPER,  hard alloys including Cu / Be Standard   Standard   20 - 30   60 - 100   118 or 135   Mineral oil Medium   NICKEL-SILVER   Standard   Quick   30 - 40   100 - 130   118   Soluble oil Medium   BRASS   Standard   Slow   40 - 80   130 - 260   118   Dry (2) soluble Heavy   PHOSPHOR-BRONZE (1), GUN METAL Standard   Slow   30 - 70   100 - 220   118   Dry (2) soluble Medium   ZINC, Zn Alloy, Mazak Standard   Standard   30 - 40   100 - 140   118   Soluble oil Heavy   ALLUMINIUM,  pure Al / Si  AI / Mn AI / Cr Alloy Standard   Quick   50 - 100   160 - 330   118 or 135   Soluble oil Very Heavy ALUMINIUM-MAGNESIUM alloy Standard   Quick   50 - 80   160 - 260   118 or 135   Dry (2) soluble Very Heavy MAGNESIUM alloy Standard   Quick   80 - 100   250 - 330   135   Dry (2)   Very Heavy TITANIUM   Very Heavy Duty Standard   5 - 12   16 - 40   118 - 135   Soluble oil Light   PLASTICS Thermo ductile, PVC polyethylene, polypropylene Standard   Quick   50 - 100   160 - 330   118 - 135   Water or Dry (2) Medium   PLASTIC Thermo setting, ebonite, bakelite, phenolite Standard   Quick   20 - 60   60 - 200   60 or 90   Dry (2)   Medium   GLASSFIBRE RE-INFORCED PLASTIC Standard wide flute Slow   50 - 100   160 - 330   80 - 90   Dry (2)   Medium   PERSPEX   Standard wide flute Slow   20 - 40   80 - 130   135   Water   Medium     (1) Tungsten Carbide Drills may be considered for these materials   (2) Compressed air may be used

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