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Drill Feeds and Speeds pdf printable format



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)

Drill Feeds and Speeds pdf printable format