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Speeds and Feeds


Drill Feeds and Speeds 

Different drilling conditions make it impossible to develop any rigid rules for feeds and speeds. The follwing tables contain guidelines that can be utilized when drilling standard materials. Also, the following “rules of thumb” can be used to determine proper feeds and speeds for drilling ferrous materials (note: varying conditions can easily require adjustments):• Feed equals .001″ per revolution for every 1/16″ of drill diameter, plus or minus .001″ on the

       total
• Speed equals 90 surface feet per minute in 100 Brinell hardness material, and the speed
be reduced 10 surface feet per minute for each additional 50 points of Brinell hardness.
• Feed and speed rates should be reduced up to 45 to 50% when drilling holes deeper than 4
drill diameters.

Diameter of Drill – Inches Feed Inches per Revolution
Under 1/8 .001 to .003
1/8 to 1/4 .002 to .006
1/4 to 1/2 .004 to .010
1/2 to 1 inch .007 to .015
1 inch and over .015 to .025
Recommended feeds of various diameter drills
NOTE: It is best to start with a moderate speed and feed, increasing either one, or both, after observing the action and condition of the drill.
Material Recommended speed (sfm)
Aluminum and its Alloys 200-300
Brass and Bronze (ordinary) 150-300
Bronze (High Tensile) 70-150
Die Casting (Zinc Base) 300-400
Iron – Cast (soft)
-Cast (medium hard)
Hard Chilled
Malleable
75-125
50-100
10-20
80-90
Magnesium and its Alloys 250-400
Monel Metal or High-Nickel Steel 30-50
Plastics or Similar Materials 100-300
Steel
Mild .2 carbon to .3 carbon
Steel .4 carbon to .5 carbon
Tool 1.2 carbon
Forgings
Alloy – 300 to 400 Brinell

80-110
70-80
50-60
40-50
20-30
High Tensile (Heat Treated)