Transcript Drill Press and Hand Drills

Drill Press and Hand Drills
Team 2165
Docu-Mentor-y
September 15, 2008
What’s a Drill Press?
• Electrically driven tool for SAFELY
making accurately positioned holes
for
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Taps
Clearance
Fasteners
Light-Weighting
Etc.
“To Do” When Drilling
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Wear appropriate safety glasses.
Start/stop button within easy reach of the operator.
Use a vacuum, brush or rake to remove cuttings.
Remove burrs and chips from a drilled hole.
When making deep holes, clean out the hole frequently.
Use a clamp or drill vise to prevent work from spinning.
Lubricate drill bit when drilling metal.
Reduce the drilling pressure when the drill begins to break through
the workpiece. This prevents drill from pulling into the work.
Keep drill bits clean and sharp.
Keep floor around the drill press free of oil and grease.
Keep the working surface clean of scraps, tools and materials.
Keep guards in place and in good working order.
“Don’t” List
• Do not wear loose clothing or ties. Roll sleeves above the elbow to
prevent them from being caught in revolving parts. Confine long hair.
• Do not wear gloves, rings, watches, or bracelets
• Do not set speeds, adjust, or measure work until machine is
completely stopped.
• Do not leave chuck key in drill chuck. Make adjustments and remove
key immediately.
• For wood - Do not hold work by hand when drilling holes larger than
12 mm (1/2 in.) in diameter.
• For metal – ALWAYS use a vise. Secure the vise to the drill table.
• Do not place hands under the stock being drilled.
• Do not stop rotation of chuck and spindle with your hand.
• Do not leave the drill press running unattended.
Types of Bits
• Drill Bits
(Left to Right):
– Twist drill
• General Purpose/Metal
– Masonry bit
• Concrete, Brick
– Lip and spur
• Wood, Plastics
– Spade
• Wood
Machine Screws
Tapping & Clearance Hole Information
Tap Drills
Clearance Hole Drills
Number
Aluminum,
All Materials
Machine
Stainless Steel,
of
Brass
&
Screw Size
Minor
Steels & Iron
Threads
Plastics
Close Fit
Free Fit
Dia.
50% Thread
Per
75% Thread
No. or Major Inch
Drill Decimal Drill Decimal Drill Decimal Drill Decimal
Dia. Dia.
Size Equiv. Size Equiv. Size Equiv. Size Equiv.
40
.0813
43
.0890
41
.0960
4
.1120
32
.1160
30
.1285
48
.0864
42
.0935
40
.0980
32
.0997
36
.1065
32
.1160
6
.1380
27
.1440
25
.1495
40
.1073
33
.1130
31
.1200
8
.1640
10
.1900
12
.2160
1/4
.2500
3/8
.3750
1/2
.5000
32
36
24
32
24
28
32
20
28
32
16
24
32
.1257
.1299
.1389
.1517
.1649
.1722
.1777
.1887
.2062
.2117
.2983
.3239
.3367
29
29
25
21
16
14
13
7
3
7/32
5/16
Q
11/32
.1360
.1360
.1495
.1590
.1770
.1820
.1850
.2010
.2130
.2188
.3125
.3320
.3438
27
26
20
18
12
10
9
7/32
1
1
Q
S
T
.1440
.1470
.1610
.1695
.1890
.1935
.1960
.2188
.2280
.2280
.3320
.3480
.3580
13
20
28
.4056
.4387
.4562
27/64 .4219
29/64 .4531
15/32 .4688
29/64
15/32
15/32
.4531
.4688
.4688
18
.1695
16
.1770
9
.1960
7
.2010
2
.2210
1
.2280
F
.2570
H
.2660
W
.3860
X
.3970
33/64
.5156
17/32 .5312
Hand Drills
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Hand Drill
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Wear safety glasses/face shield.
Keep drill air vents clear to
maintain adequate ventilation.
Keep drill bits sharp.
Keep all cords clear of the cutting
area during use. Inspect for frays
or damage before each use.
Disconnect power supply before
changing or adjusting bit or
attachments.
Tighten the chuck securely.
Remove chuck key before starting
drill.
Secure work piece being drilled to
prevent movement.
Let’s Drill A Fastener Hole!
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Check the drill press speed chart for the correct combination of material, bit size, and speed
Factors which determine the best speed:
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Kind of material being worked (metal, acrylic, aluminum, wood, etc.)
Size of hole
Type of drill bit
Quality of cut desired
Typically, the smaller the drill bit, the greater the required RPM
In soft materials, the speed should be higher than for hard materials
Insert drill bits about 3/4" (and at least 1/4") into the chuck and tighten securely
Set the table height and tighten the table lock before using the drill
To prevent rotation of the work piece, clamp the work securely to the table, either with a "C"
clamp, a drill press clamp or a vise
NEVER hold a metal piece by hand when drilling. Use a vise and clamp the vise to the drill table!
When using paddle/spade drill bits, you should always use a hold down clamp
When drilling a through hole, place the material on a scrap piece of wood. This prevents drilling
into the metal table surface! Drilling into the table damages the table and ruins the drill bits
When drilling into metal, a cutting lubricant should be used.
Cast iron and brass/bronze should be drilled dry
Return bits to drawer when you are done
Clean The Area Around The Press
Tonight’s Assignment
• Hand Drill
– Fasten decking to a
couple of 2x4s
– Mark the part for hole
locations
– Use a wood awl or
punch to mark the hole
locations
– Use a deck screw and
hand drill to join the
parts
• Drill Press
– Mark the center line of
the metal piece
– Measure for 2
clearance bolt holes:
• ¼” bolt (H or 17/64”)
• #10 bolt (#7)
– Measure and punch a
center to center
separation of 1”
– Clamp and drill the
part