Milwaukee 4270-20 User Manual
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
Catalog No.
No de Cat.
Catálogo No.
4270-20
COMPACT ELECTROMAGNETIC DRILL PRESS
PERCEUSE À COLONNE ÉLECTROMAGNÉTIQUE COMPACTE
PRENSA TALADRADORA ELECTROMAGNETICA COMPACTA
TO REDUCE THE RISK OF INJURY, USER MUST READ AND UNDERSTAND OPERATOR'S MANUAL.
AFIN DE RÉDUIRE LE RISQUE DE BLESSURES, L'UTILISATEUR DOIT LIRE ET BIEN COMPRENDRE LE
MANUEL DE L'UTILISATEUR.
PARA REDUCIR EL RIESGO DE LESIONES, EL USUARIO DEBE LEER Y ENTENDER EL MANUAL DEL
OPERADOR.
page 2
GENERAL SAFETY RULES FOR ALL POWER TOOLS
WARNING!
Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury. The term "power tool" in
all of the warnings listed below refers to your mains-operated (corded) power tool or battery-opearted (cordless) power tool.
SAVE THESE INSTRUCTIONS
READ ALL INSTRUCTIONS
WORK AREA SAFETY
1. Keep work area clean and well lit. Cluttered or dark areas invite
accidents.
2. Do not operate power tools in explosive atmospheres, such
as in the presence of flammable liquids, gases, or dust.
Power tools create sparks which may ignite the dust or fumes.
3. Keep children and bystanders away while operating a power
tool. Distractions can cause you to lose control.
ELECTRICAL SAFETY
4. Power tool plugs must match the outlet. Never modify the
plug in any way. Do not use any adapter plugs with earthed
(grounded) power tools. Unmodified plugs and matching outlets
will reduce risk of electric shock.
5. Avoid body contact with earthed or grounded surfaces such
as pipes, radiators, ranges and refrigerators. There is an
increased risk of electric shock if your body is earthed or grounded.
6. Do not expose power tools to rain or wet conditions. Water
entering a power tool will increase the risk of electric shock.
7. Do not abuse the cord. Never use the cord for carrying,
pulling, or unplugging the power tool. Keep cord away from
heat, oil, sharp edges, or moving parts. Damaged or entangled
cords increase the risk of electric shock.
8. When operating a power tool outdoors, use an extension
cord suitable for outdoor use. Use of a cord suitable for outdoor
use reduces the risk of electric shock.
PERSONAL SAFETY
16. Do not force the power tool. Use the correct power tool for
your application. The correct power tool will do the job better and
safer at the rate for which it was designed.
17. Do not use the power tool if the switch does not turn it on
and off. Any power tool that cannot be controlled with the switch is
dangerous and must be repaired.
18. Disconnect the plug from the power source and/or the bat-
tery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such
preventive safety measures reduce the risk of starting the tool accidentally.
19. Store idle power tools out of the reach of children and do
not allow persons unfamiliar with the power tools or these
instructions to operate power tools. Power tools are danger-
ous in the hands of untrained users.
20. Maintain power tools. Check for misalignment or binding of
moving parts, breakage of parts and any other condition
that may affect the power tool's operation. If damaged, have
the power tool repaired before use. Many accidents are caused
by poorly maintained power tools.
21. Keep cutting tools sharp and clean. Properly maintained cutting
tools with sharp cutting edges are less likely to bind and are easier
to control.
22. Use the power tool, accessories and tool bits etc., in accor-
dance with these instructions and in the manner intended
for the particular type of power tool, taking into account the
working conditions and the work to be performed. Use of
the power tool for operations different from those intended could
result in a hazardous situation.
POWER TOOL USE AND CARE
SERVICE
9. Stay alert, watch what you are doing and use common sense
when operating a power tool. Do not use a power tool while
you are tired or under the influence of drugs, alcohol or
medication. A moment of inattention while operating power tools
may result in serious personal injury.
10. Use safety equipment. Always wear eye protection. Safety
equipment such as dust mask, non-skid safety shoes, hard hat, or
hearing protection used for appropriate conditions will reduce personal injuries.
11. Avoid accidental starting. Ensure the switch is in the off-
position before plugging in. Carrying tools with your finger on
the switch or plugging in power tools that have the switch on invites
accidents.
12. Remove any adjusting key or wrench before turning the
power tool on. A wrench or a key left attached to a rotating part of
the power tool may result in personal injury.
13. Do not overreach. Keep proper footing and balance at all
times. This enables better control of the power tool in unexpected
situations.
14. Dress properly. Do not wear loose clothing or jewellery.
Keep your hair, clothing and gloves away from moving parts.
Loose clothes, jewellery, or long hair can be caught in moving parts.
15. If devices are provided for the connection of dust extrac-
tion and collection facilities, ensure these are connected
and properly used. Use of these devices can reduce dust-re-
lated hazards.
23. Have your power tool serviced by a qualified repair person
using only identical replacement parts. This will ensure that
the safety of the power tool is maintained.
page 3
SPECIFIC SAFETY RULES FOR ELECTROMAGNETIC DRILL PRESS
1. Always use safety strap when drilling overhead or on a vertical surface (see Safety Strap under Operation).
Mounting can release.
2. Clean the surface before attaching the drill stand to the work surface. Paint, rust, scale, or uneven surfaces decrease the holding
strength of the magnet. Chips, burrs, dirt and other foreign matter on the surface of the magnet base will also decrease holding power.
3. Do not attach magnetic base to nonmagnetic grades of stainless steel. The magnetic base WILL NOT hold. The electromagnetic drill
press attaches magnetically to 3/8" or thicker ferrous stock. Do not use on stock less than 3/8".
4. Wet connections are shock hazards. If the plug or connections get wet, turn power off to the outlet before unplugging the tool. Prevent
cutting fluid from traveling along the cord and contacting the outlet, extension cord connections or tool plug. Each time tool is plugged in, elevate
extension cord or gang box connections and arrange a drip loop.
5. Maintain labels and nameplates. These carry important information. If unreadable or missing, contact a MILWAUKEE service facility for a free
replacement.
6. Wear ear protectors with impact drills. Exposure to noise can cause hearing loss.
7. Hold power tools by insulated gripping surfaces when performing an operation where the cutting tool may contact hidden
wiring or its own cord. Contact with a live wire will make exposed metal parts of the tool live and shock the operator.
8. WARNING! Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to cause
cancer, birth defects or other reproductive harm. Some examples of these chemicals are:
lead from lead-based paint
crystalline silica from bricks and cement and other masonry products, and
arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals: work in
a well ventilated area, and work with approved safety equipment, such as those dust masks that are specially designed to filter out microscopic
particles.
9. Safety Strap
A. Do not use near acids or bleaching agents.
B. Do not use for overhead lifting.
C. Do not use strap if webbing is cut.
D. Webbing must be protected from sharp edges.
E. All hardware must be in line with direction of pull for rated capacity.
Cat.
No.
Symbology
Volts Alternating Current
Amps
Double Insulated
No Load Revolutions per Minute (RPM)
Underwriters Laboratories, Inc.
Canadian Standards Association
DANGER! To reduce the risk of injury, always keep hands,
rags, clothing, etc. away from moving parts and chips. Do
not try to remove chips while the cutter is rotating. Chips are
sharp and can pull objects into moving parts.
Specifications
Volts
AC
Only
Amps
No Load
RPM
Arbor
Bore
*Twist
Drill
HSS
Cutter
page 4
4270-20
* Requires use of 1/2" drill chuck adapter, see "Accessories."
120
9.0
450
3/4"
1/2"
1-1/2"
FUNCTIONAL DESCRIPTION
1. Drill motor
2. Slide
3. Wrench storage
(includes 3/32" and 3/16" hex keys)
4. Stop knob
5. Pinion
6. Hub
7. Handle screw
8. Feed handle
9. Grip
10. Housing
11. Cord
12. Safety strap
13. Magnetic base
14. Spacer
15. Drill spindle
16. Support bracket
17. Cutting fluid reservoir
18. Control panel
19. Magnet indicator light
20. Magnet switch
21. Drill on/off switch
22. Hand pump
16
15
17
4
1
2
3
6
7
8
10
5
9
11
12
18
19
21
20
FEATURES
Line Lockout
The line lockout prevents the drill motor from starting when line power is
first applied to the system or after a momentary power loss. To reset tool,
turn magnet switch to "OFF" position and drill on/off switch to "OFF"
position.
14
Motor/Magnet Interlock
The motor/magnet interlock is a feature that prevents power from being
applied to the drill motor if the magnet is not energized. The motor magnet
interlock also prevents the magnet from being de-energized while the
motor is running.
13
22
page 5
GROUNDING EXTENSION CORDS
WARNING!
Improperly connecting the grounding wire can result in the
risk of electric shock. Check with a qualified electrician if you
are in doubt as to whether the outlet is properly grounded.
Do not modify the plug provided with the tool. Never remove
the grounding prong from the plug. Do not use the tool if the
cord or plug is damaged. If damaged, have it repaired by a
MILWAUKEE service facility before use. If the plug will not fit
the outlet, have a proper outlet installed by a qualified
electrician.
Grounded Tools:
Tools with Three Prong Plugs
Tools marked Grounding Required
have a three wire cord and three
prong grounding plug. The plug must
be connected to a properly grounded
outlet (See Figure A). If the tool should
electrically malfunction or break
down, grounding provides a low resistance path to carry electricity
away from the user, reducing the risk
of electric shock.
The grounding prong in the plug is connected through the green wire
inside the cord to the grounding system in the tool. The green wire in the
cord must be the only wire connected to the tool's grounding system and
must never be attached to an electrically live terminal.
Your tool must be plugged into an appropriate outlet, properly installed
and grounded in accordance with all codes and ordinances. The plug
and outlet should look like those in Figure A.
Double Insulated Tools:
Tools with Two Prong Plugs
Tools marked Double Insulated do
not require grounding. They have a
special double insulation system
which satisfies OSHA requirements
and complies with the applicable
standards of Underwriters Laboratories, Inc., the Canadian Standard
Association and the National Electrical Code. Double Insulated tools may
be used in either of the 120 volt outlets shown in Figures B and C.
Fig. A
Fig. B
Fig. C
Grounded tools require a three wire extension cord. Double insulated
tools can use either a two or three wire extension cord. As the distance
from the supply outlet increases, you must use a heavier gauge extension cord. Using extension cords with inadequately sized wire causes a
serious drop in voltage, resulting in loss of power and possible tool
damage. Refer to the table shown to determine the required minimum
wire size.
The smaller the gauge number of the wire, the greater the capacity of the
cord. For example, a 14 gauge cord can carry a higher current than a 16
gauge cord. When using more than one extension cord to make up the
total length, be sure each cord contains at least the minimum wire size
required. If you are using one extension cord for more than one tool, add
the nameplate amperes and use the sum to determine the required minimum wire size.
Guidelines for Using Extension Cords
If you are using an extension cord outdoors, be sure it is marked
with the suffix W-A (W in Canada) to indicate that it is acceptable
for outdoor use.
Be sure your extension cord is properly wired and in good electrical
condition. Always replace a damaged extension cord or have it
repaired by a qualified person before using it.
Protect your extension cords from sharp objects, excessive heat
and damp or wet areas.
Recommended Minimum Wire Gauge
Nameplate
Amperes
8.1 - 12
12.1 - 15
15.1 - 20
* Based on limiting the line voltage drop to five
volts at 150% of the rated amperes.
for Extension Cords*
25'
0 - 5
5.1 - 8
16
16
14
12
10
Extension Cord Length
100'
14
12
10
10
150'
12
10
--
--
--
--
50'
16
16
14
12
10
75'
16
14
12
10
10
200'
12
--
--
--
--
READ AND SAVE ALL INSTRUCTIONS
FOR FUTURE USE.
page 6
TOOL ASSEMBLY
WARNING!
To reduce the risk of injury, always unplug tool before
attaching or removing accessories or making adjustments.
Use only specifically recommended accessories. Others
may be hazardous.
Attaching Feed Handles and Grips (Fig. 1)
Fig. 1
1. Assemble the feed handles and grips to the hub. Tighten securely.
2. To mount the hub to either side, align the two (2) dowel pins on the
hub with the holes in the pinion. Tighten the handle screw.
Stop Knob (Fig. 2)
The stop knob is designed to stop the slide from moving.
To install, screw stop knob into location shown (Fig. 2).
Adjusting the Gib Assembly (Fig. 3)
Fig. 3
To adjust the gib, loosen or tighten the gib adjustment set screws on the
side of the support housing accordingly with the 3/32" hex key provided.
Tightening the set screws increases friction on the slide. The gib should
be set tight enough to support the weight of the drill in any position. All
adjusting screws should be set to provide smooth and even travel over
the entire length of slide movement.
The set screws contain a nylon patch that prevents them from moving
freely. Additional adjustment of the gib may be required from time to time
with extended use of the tool.
Adjusting the Support Bracket and Spacer for Depth of Cut
(Figs. 4 & 5)
This unit is shipped from the factory set for 1" depth cutters (Fig. 4).
Fig. 2
Stop
knob
Fig. 4
Spacer
Support bracket
When using 2" depth cutters, install support bracket with spacer on
bottom, as shown in Fig. 5.
Fig. 5
Spacer
Support bracket
NOTE: Do not use a spacer and support bracket with chuck adapter.
page 7
OPERATION
WARNING!
To reduce the risk of injury, wear safety goggles or glasses
with side shields.
Typical Operation
1. Check the work surface to make sure it is clean and free of foreign
materials.
Paint, rust, scale or uneven surfaces decrease the holding strength
of the magnet. Chips, burrs, dirt and other foreign materials on the
surface of the magnetic base will also decrease holding power. Use
a smooth, flat file to keep the magnet clean and free of nicks.
The electromagnetic drill press attaches magnetically to 3/8" or thicker
ferrous stock. Do not use on stock less than 3/8". The magnetic
base WILL NOT hold on nonmagnetic grades of stainless steel.
2. To install/remove cutter:
A. Raise the drill motor to its highest position. Tighten stop knob.
B. Insert cutter into drill spindle with the two (2) flats of the cutter
aligned with set screws. Make sure the center pin is inserted
into the cutter.
NOTE: Cutter should be fully seated into drill spindle.
C. Tighten set screws with 3/16" hex key provided.
D. Loosen the stop knob.
E. Reverse procedure to remove cutter.
NOTE: Do not remove cutter unless slug is removed. Slug may
eject unexpectedly.
Avoid contact with cutter tips. Periodically inspect the cutter tips for
loose or damaged tips.
3. Plug in tool to power source.
WARNING!
To reduce the risk of injury, do not hold workpiece by hand.
5. Position the tool so the center pin is directly over the desired cutting
location. Push the magnet switch to the ON position. The magnet
indicator light will turn on.
WARNING!
To reduce the risk of injury, always use a safety strap when
drilling overhead or on a vertical surface.
6. Use a safety strap on vertical or overhead situations (Fig. 7).
A. Route the safety strap, ring side first, through the lower slot,
and wrap it tightly around a solid, rigid structure as shown.
Make sure the strap is not twisted.
B. Hook the safety strap snaphook provided to the ring.
Eliminate any slack in the strap.
C. When using on a vertical surface, secure the safety strap
with a c-clamp or similar device. This will hold the strap in
place and prevent the tool from sliding down the vertical
surface.
NOTE: Do not clamp to the strap. This may damage the strap
and cause it to break (Fig. 7).
Fig. 7
C-clamp
WARNING!
Do not use cutting fluid in an overhead or any other posi-
tion that allows cutting fluid to enter motor or switch
enclosure.
Wet connections are shock hazards. Prevent cutting fluid
from traveling along cord and contacting the outlet, extension cord connections or tool plug. Each time tool is
plugged in, elevate extension cord or gang box connections and arrange a drip loop (See Fig. 6). If plug or connections get wet, turn power off to outlet before
unplugging tool.
Fig. 6
4. Move the spindle up so the cutter and center pin are above the work
surface.
7. With the drill on/off switch in the "OFF" position, fill the cutting fluid
reservoir with cutting fluid through the slots in the drill spindle
(Fig. 8).
Fig. 8
The cutting fluid reservoir will empty as the center pin contacts the
work surface. When notching or slotting, it is required to spray
cutting fluid directly to the cutter and work piece with the supplied
hand pump. Keep hand pump away from moving parts. Failure to
use the lubricant properly will cause cutter damage.
The use of HAWG WASH® cutting fluid is recommended for long life
of these cutters. The operator is responsible for the application of
lubricants other than HAWG WASH® cutting fluid.
In overhead or vertical cutting applications, do not use cutting
fluids. Use only lubricant pastes or sprays recommended for high speed
cutting. Do not allow lubricant pastes and sprays to enter tool.
page 8
8. Start the drill motor by pulling the drill on/off switch to the "ON" position.
WARNING!
To reduce the risk of injury, always keep hands, rags, clothing,
etc. away from moving parts and chips. Do not try to remove
chips while the cutter is rotating. Chips are sharp and can pull
objects into moving parts (see Fig. 9).
Fig. 9
9. These units have a 8:1 feed ratio: i.e. for every pound applied to the
handle, you create eight pounds on the drill point. Even large bits only
require a small amount of pressure on the handle. Example: 20 Pounds
on the handle creates 160 Pounds on the drill point.
When feeding the cutter into the material, apply only enough force to
produce a curled chip. Applying too little force will result in small broken chips and increased cutting time. Applying too much force will
cause overheating of the cutter resulting in short cutter life. Overheating of the cutter can be noticed when cutter and chips turn brown or
blue. Excessive force can cause the cutter to slow down to a point
where cutting time will increase. The use of cutting lubricants will
reduce cutting heat and increase cutter life
Use less feed pressure when slotting or notching because there is
less support for the cutting edges in these situations.
WARNING!
Excessive force will break magnet free.
10. Keep constant pressure throughout the entire operation to
prevent chips and burrs from falling under the cutting edges.
Cutting debris under the cutter can make cutting difficult or
impossible.
11. When the cut is complete, withdraw the cutter while the drill spindle
is still rotating.
12. Stop the drill motor by pushing in the drill on/off switch to the "OFF"
position.
13. When the drill spindle has stopped rotating, use a pliers to remove
cutting debris and chips from the cutter and spindle. Use care to
avoid damaging the cutter teeth.
14. If the slug is still present in the cutter, rotate the feed handle to
highest position. This will eject the slug from the cutter.
The center pin is spring loaded. Provide protection from ejected
slug for people and property below cutting area.
15. Make sure you have a firm grip on the tool before turning off the
magnet.
Push the magnet switch to the "OFF" position. The magnet
indicator light will turn off.
page 9
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