Speeds For Drilling

The speeds shown are for average conditions where coolant can be efficiently applied.  Where the strength of the drill is not a critical factor and where the workpiece can be rigidly supported.  When one or more of these conditions vary, the speeds must be adjusted accordingly.

 

Material Being Drilled	Cutting Speed (SFM)	Point Style	Point Angle Degree	Feed Rate
Aluminum Alloys	200-300	Conventional	118	Med-Hvy.
Magnesium Alloys	200-300	Conventional	118	Med-Hvy.
Brass & Bronze	75-150	Conventional	118	Med-Hvy.
Cast Iron Soft Medium Hard Hard Chilled Malleable	75-125 50-100 10-20 75-125	Conv. or Split Conv. or Split Conv. or Split Conventional	118 or 135 118 or 135 118 118 or 135	Med-Hvy. Med. Lt-Med Med.
Steel Mild, .2 to .3 Carbon Medium, .4 to .5 Carbon Tool, 1.2 Carbon Forgings	50-100 45-80 40-60 40-60	Conventional Conventional Conventional Conventional	118 118 118 118	Med-Hvy. Med. Med. Med.
Alloy, 300 to 400 BHN High Tensile Rc 35-40 Rc 40-45 Rc 45-50 Rc 50-55	20-30   30-40 25-35 15-25 7-15	Conv. or Split   Conv. or Split Conv. or Split Conv. or Split Conv. or Split	118 or 135   118 or 135 118 or 135 118 or 135 118 or 135	Med.   Med. Med. Lt-Med. Lt-Med.
Maraging, Heat Treated Maraging, Annealed	7-20 40-55	Conv. or Split Conv. or Split	118 or 135 118 or 135	Med. Lt-Med.
Titanium Alloys Commercially Pure 5AI-2SN, 8AI-1 Mo-1V 2Fe-2Cr-Mo Annealed 6AI-4V, 4AI-4MN, 7AI-4Mo 5AI-2Sn, 8AI-1 Mo-1V 2Fe-2CR-Mo Solution Treated & Aged	50-60 20-45   20-35 15-20	Heavy Duty Split Heavy Duty Split   Heavy Duty Split Heavy Duty Split	135 135   135 135	Med. Med.   Med. Med.
High Temperature Alloys Cobalt Base, HS25, S816, V36 INCO 800, A286, N155 Nickel Base, Inconel 700 U500, Rene 41 Monel Metal	7-20 7-20 5-15   30-50	Heavy Duty Split Heavy Duty Split Heavy Duty Split   Heavy Duty Split	135 135 135   135	Med. Med. Med.   Med.
Stainless Steel Free Machining, 303, 416, 420 Austenitic, 300 Series Ferritic, 400 Series Martensitic, Heat Treated	30-100 20-60 20-60 10-30	Heavy Duty Split Heavy Duty Split Heavy Duty Split Heavy Duty Split	135 135 135 135	Med. Med. Med. Med.
Plastics and Related Materials Zinc Alloys	100-200 150-250	Low Angle Conventional	90 118	Med-Hvy. Med-Hvy.