Metal Drilling
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METAL DRILLING
139
Jobber Length Drill Bits
Cutting Speeds (by Working Material)
Speeds for High Speed Steel Drills
Aluminum and its Alloys
Brass and Bronze (Ordinary)
Bronze (High Tensile)
Die Castings (Zinc Base)
Iron-Cast (Soft)
Cast (Medium hard)
Hard Chilled
Malleable
Magnesium and its Alloys
Monel Metal or High-Nickel Steel
Plastics or Similar Materials (Bakelite)
Steel – Mild (.2 carbon to .3 carbon)
Steel (.4 carbon to .5 carbon)
Tool (1.2 carbon)
Forgings
Alloy – 300 to 400 Brinell
High Tensile (Heat-Treated)
35
to 40 Rockwell C
40
to 45 Rockwell C
45
to 50 Rockwell C
50
to 55 Rockwell C
Stainless Steel
Free Machining Grades
Work Hardening Grades
Wood
*
Surface Feet per Minute (SFM)
Speeds and Feeds for Deep-Hole Drilling
Holes that qualify as “deep-hole drilling" are three or more drill bit diameters
deep. When drilling this deep, the speed and feed rate must be adjusted to
reduce friction. Friction creates heat, and heat build-up in the drill bit can cause
failure and breakage. Lubricants help dissipate heat from the tip of the drill bit,
prolonging drill life, and should always be used when deep-hole drilling.
Another technique that should be used when deep-hole drilling is “pecking."
Pecking is the process whereby the user drills a short distance, then backs the drill
out of the hole before progressing. Pecking reduces the possibility of chips getting
lodged in the flute, and allows for the reintroduction of lubricant into the hole.
SFM*
200 - 300
150 - 300
70 - 150
300 - 400
100 - 150
70 - 100
30 - 40
80 - 90
250 - 400
30 - 50
100 - 300
80 - 110
70 - 80
50 - 60
40 - 50
20 - 30
30 - 40
25 - 35
15 - 25
7 - 15
30 - 80
15 - 50
300 - 400
SFM x 3.82
Drill Diameter
RPM =
Drill Dia.
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
Hole Depth to Dia.
(
times drill dia.)
Speed
Reduction
Feed
Reduction
3
10%
10%
4
20%
10%
5
30%
20%
6
35 - 40%
20%
Speed and Feed Reduction
(
Based on the hole depth)
Feed Per Drill Revolution
See pages 175-176 for Tap & Drill Selection Chart
Size
Decimal
Equiv.
Flute
Length
Overall
Length
Carded
Item #
Bulk
Item #
1/16"
.0625
7/8"
1-7/8"
3015004*
5/64"
.0781
1"
2"
3015005*
3/32"
.0938
1-1/8"
2-1/4"
3015006*
7/64"
.1094
1-1/2"
2-5/8"
3015007*
1/8"
.1250
1-5/8"
2-3/4"
3015008
9/64"
.1406
1-3/4"
2-7/8"
3015009
5/32"
.1563
2"
3-1/8"
3015010
11/64"
.1719
2-1/8"
3-1/4"
3015011
3/16"
.1875
2-5/16"
3-1/2"
3015012
13/64"
.2031
2-7/16"
3-5/8"
3015013
7/32"
.2188
2-1/2"
3-3/4"
3015014
15/64"
.2344
2-5/8"
3-7/8"
3015015
1/4"
.2500
2-3/4"
4"
3015016
17/64"
.2656
2-7/8"
4-1/8"
3015017
9/32"
.2813
2-15/16"
4-1/4"
3015018
19/64"
.2969
3-1/16"
4-3/8"
3015019
5/16"
.3125
3-3/16"
4-1/2"
3015020
21/64"
.3281
3-5/16"
4-5/8"
3015021
11/32"
.3438
3-7/16"
4-3/4"
3015022
23/64"
.3594
3-1/2"
4-7/8"
3015023
3/8"
.3750
3-5/8"
5"
3015024
25/64"**
.3906
3-3/4"
5-1/8"
3015025
13/32"**
.4063
3-7/8"
5-1/4"
3015026
27/64"**
.4219
3-15/16"
5-3/8"
3015027
7/16"**
.4375
4-1/16"
5-1/2"
3015028
29/64"**
.4531
4-3/16"
5-5/8"
3015029
15/32"**
.4688
4-5/16"
5-3/4"
3015030
31/64"**
.4844
4-3/8"
5-7/8"
3015031
1/2"**
.5000
4-1/2"
6"
3015032
TURBOMAX
®
Titanium HSS Fractional Jobber Length
Drill Bits (Series 3015)
3015012
Titanium nitride (TiN) coating resists heat and friction,
providing up to six times longer life than standard high speed
steel bits.
Self-centering, precision-ground TURBOMAX
®
feature-point
tip eliminates “walking” on flat and curved surfaces, stays
sharp longer, and drills faster than standard high speed steel
bits.
• 3-
flatted shank on 3/16” and above sizes for exceptional grip
on chuck.
Sets
:
Pro Set Cases:
3018008, 3018009, 3018010, 3018011
*
Note: 2 bits per Card **Note: 3/8” reduced shank
I...,129,130,131,132,133,134,135,136,137,138 140,141,142,143,144,145,146,147,148,149,...242