IRWIN 3-piece step bit kit Verweisanleitung
©2004 Printed in U.S.A.
Huntersville, NC 28078
1-800-GO-IRWIN
www.irwin.com
MD04-300
1-800-GO-IRWIN
www.irwin.com
MD04-300
Speeds for High Speed Steel Drills
SFM*
Aluminum and its Alloys
200-300
Brass and Bronze (Ordinary)
150-300
Bronze (High Tensile)
70-150
Die Castings (Zinc Base)
300-400
Iron-Cast (Soft)
100-150
Cast (Medium hard)
70-100
Hard Chilled
30-40
Malleable
80-90
Magnesium and its Alloys
250-400
Monel Metal or High-Nickel Steel
30-50
Plastics or Similar Materials (Bakelite)
100-300
Steel - Mild (.2 carbon to .3 carbon)
80-110
Steel (.4 carbon to .5 carbon)
70-80
Tool (1.2 carbon)
50-60
Forgings
40-50
Alloy - 300 to 400 Brinell
20-30
High Tensile (Heat Treated)
35
35
to 40 Rockwell C
30-40
40
to 45 Rockwell C
25-35
45
to 50 Rockwell C
15-25
50
to 55 Rockwell C
7-15
Stainless Steel
Free Machining Grades
30-80
Work Hardening Grades
15-50
Wood
300-400
*Surface Feet per Minute (SFM)
Drill Diameter
Range
Light
Medium
Heavy
1/16 to 1/8
.0005 - .0010 .0010 - .0020 .0020 - .0040
1/8 to 1/4
.0010 - .0030 .0030 - .0050 .0040 - .0050
1/4 to 3/8
.0030 - .0050 .0050 - .0070 .0060 - .0100
3/8 to 1/2
.0040 - .0060 .0050 - .0080 .0080 - .0120
1/2 to 3/4
.0050 - .0070 .0070 - .0100 .0090 - .0140
3/4 to 1
.0070 - .0100 .0090 - .0140 .0140 - .0200
Feed Per Drill Revolution
Cutting Speeds - by Working Material
Deep Hole Drilling Parameters
Holes that fall into the “deep-hole drilling”
category are three or more drill bit diameters
in depth. When you are drilling this deep,
you must adjust your speeds and feeds
accordingly. The deeper the hole is, the more
probable that chips might lodge in the flutes
and clog the drill. When the flute clogs,
the amount of friction and heat will increase.
Heat build-up in the drill bit could cause failure
and breakage. Lubricants always help the
dissipation of heat from the tip of the drill bit,
which prolongs the drill’s life. Removing the drill
and evacuating the chips after drilling short
distances, often called “step-drilling,” will also
lessen the chance of heat build-up. Some good
rules of thumb when deep-hole drilling are to
reduce your rate of speed and feed, remove
the bit more often from the material, and use
lubricant whenever you can.
category are three or more drill bit diameters
in depth. When you are drilling this deep,
you must adjust your speeds and feeds
accordingly. The deeper the hole is, the more
probable that chips might lodge in the flutes
and clog the drill. When the flute clogs,
the amount of friction and heat will increase.
Heat build-up in the drill bit could cause failure
and breakage. Lubricants always help the
dissipation of heat from the tip of the drill bit,
which prolongs the drill’s life. Removing the drill
and evacuating the chips after drilling short
distances, often called “step-drilling,” will also
lessen the chance of heat build-up. Some good
rules of thumb when deep-hole drilling are to
reduce your rate of speed and feed, remove
the bit more often from the material, and use
lubricant whenever you can.
Hole Depth
to Diameter
(times drill diameter)
Ration Speed
Reduction
Feed
Reduction
3
10%
10%
4
20%
10%
5
30%
20%
6
35-40%
20%
Speed and Feed Reduction
(Based upon hole depth)
Speeds and Feeds for Deep
Hole Drilling
IRWIN Industrial Tool Company
Customer Service
Tel. 1.800.866.5741
Fax 1.800.866.5742
Fax 1.800.866.5742
METAL DRILLING
REFERENCE GUIDE
RPM =
SFM x 3.82
Drill Diameter