Cat. No.
No de cat.
4272-21
4274-21
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
1-5/8" MAGNETIC DRILLS
PERCEUSE MAGNÉTIQUE DE 41 mm (1-5/8")
TALADROS MAGNÉTICOS DE 41 mm (1-5/8")
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.
GENERAL POWER TOOL SAFETY WARNINGS
WARNING Read all safety warnings, instructions, illustrations and specifi cations provided
with this power tool. Failure to follow all instructions listed below may result in electric shock, fi re
and/or serious injury. Save all warnings and instructions for future reference. The term "power tool" in
the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
• Keep work area clean and well lit. Cluttered or
dark areas invite accidents.
• Do not operate power tools in explosive atmospheres, such as in the presence of fl ammable
liquids, gases or dust. Power tools create sparks
which may ignite the dust or fumes.
• Keep children and bystanders away while operating a power tool. Distractions can cause you
to lose control.
ELECTRICAL SAFETY
WORK AREA SAFETY
• 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. Unmodifi ed plugs and matching outlets will
reduce risk of electric shock.
• 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.
• Do not expose power tools to rain or wet conditions. W ater entering a power tool will increase the
risk of electric shock.
• 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.
• 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.
• If operating a power tool in a damp location is
unavoidable, use a ground fault circuit interrupter (GFCI) protected supply. Use of an GFCI
reduces the risk of electric shock.
PERSONAL SAFETY
• 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 infl uence of drugs, alcohol or medication. A
moment of inattention while operating power tools
may result in serious personal injury.
• Use personal protective equipment. Always
wear eye protection. Protective equipment such
as a dust mask, non-skid safety shoes, hard hat or
hearing protection used for appropriate conditions
will reduce personal injuries.
• Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to power source and/or battery pack, picking
up or carrying the tool. Carrying power tools with
your fi nger on the switch or energizing power tools
that have the switch on invites accidents.
• 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.
• Do not overreach. Keep proper footing and bal-
ance at all times. This enables better control of the
power tool in unexpected situations.
• Dress properly. Do not wear loose clothing or
jewelry. Keep your hair and clothing away from
moving parts. Loose clothes, jewelry or long hair
can be caught in moving parts.
• If devices are provided for the connection of
dust extraction and collection facilities, ensure
these are connected and properly used. Use of
dust collection can reduce dust-related hazards.
• Do not let familiarity gained from frequent use of
tools allow you to become complacent and ignore tool safety principles. A careless action can
cause severe injury within a fraction of a second.
POWER TOOL USE AND CARE
• 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.
• 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.
• Disconnect the plug from the power source and/
or remove the battery pack, if detachable, from
the power tool before making any adjustments,
changing accessories, or storing power tools.
Such preventive safety measures reduce the risk
of starting the power tool accidentally.
• Store idle power tools out of the reach of children and do not allow persons unfamiliar with
the power tool or these instructions to operate
the power tool. Power tools are dangerous in the
hands of untrained users.
• Maintain power tools and accessories. 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.
• Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges
are less likely to bind and are easier to control.
• Use the power tool, accessories and tool bits
etc. in accordance with these instructions, 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.
• Keep handles and grasping surfaces dry, clean
and free from oil and grease. Slippery handles
and grasping surfaces do not allow for safe handling
and control of the tool in unexpected situations.
2
• Have your power tool serviced by a qualifi ed
repair person using only identical replacement
parts. This will ensure that the safety of the power
tool is maintained.
SPECIFIC SAFETY RULES
• Always use safety chain. Mounting can release.
• DANGER! T o reduce the risk of injury , always keep
hands, gloves, 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.
• 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.
• Do not attach magnetic base to nonmagnetic
grades of stainless steel. The magnet base WILL
NOT hold. The 4272-21 drill attaches magnetically
to 3/8" or thicker ferrous stock, and the 4274-21 to
1/4" or thicker ferrous stock. Do not use on stock
less than 1/4".
• Hold power tool by insulated gripping surfaces,
when performing an operation where the cutting
accessory may contact hidden wiring or its own
cord. Cutting accessory contacting a “live” wire may
make exposed metal parts of the power tool “live”
and could give the operator an electric shock.
• Safety Strap
• Do not use near acids or bleaching agents.
• Do not use for overhead lifting.
• Do not use strap if webbing is cut.
• W ebbing must be protected from sharp edges.
• All hardware must be in line with direction of
pull for rated capacity.
• Maintain labels and nameplates. These carry
important information. If unreadable or missing,
contact a MILWAUKEE service facility for a free
replacement.
• 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.
SERVICE
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 fi lter out microscopic particles.
C
SPECIFICATIONS
Cat. No. Magnet Volts a.c. Amps No Load RPM
4272-21 Electro 120 13 High 730
4274-21 Permanent 120 13 High 730
* Requires use of 1/2" drill chuck adapter, see "Accessories."
Low 475
Low 475
3
SYMBOLOGY
Double Insulated
Volts
Alternating Current
Amps
No Load Revolutions per
Minute (RPM)
Underwriters Laboratories, Inc.
US
United States and Canada
DANGER! To reduce the risk
of injury, always keep hands,
gloves, 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.
*Twist Drill HSS Cutter
1/2" 1-5/8"
1/2" 1-5/8"
FUNCTIONAL DESCRIPTION
Cat. No. 4274-21
3
5
1. Slide rail
2. Carrying handle
3. Feed handle
4. Magnet activation
switch (4272-21 only)
5. Magnet activation knob
(4274-21 only)
6. Speed selector
7. Motor adjustment lever
8. On(I) / Off(O) switch
9. Drill motor
8
9
10
2
10. Cutting fl uid fi tting
11. Quick-change arbor
12. Safety strap bracket
(strap not shown)
13. Magnetic base
14. LED button
15. Hand pump and
tube (not shown)
GROUNDING
Grounded tools require a three wire extension
1
6
7
WARNING Improperly connecting the
grounding wire can result in the risk of electric shock. Check with a qualifi ed 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
fi t the outlet, have a proper outlet installed by
a qualifi ed 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 satisfi es 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
4
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 suffi x “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
qualifi ed person before using it.
• Protect your extension cords from sharp objects,
excessive heat and damp or wet areas.
* Based on limiting the line voltage drop to fi ve volts at
150% of the rated amperes.
INSTRUCTIONS FOR FUTURE USE.
EXTENSION CORDS
Recommended Minimum Wire Gauge
For Extension Cords*
Nameplate
Amperes
0 - 2.0
2.1 - 3.4
3.5 - 5.0
5.1 - 7.0
7.1 - 12.0
12.1 - 16.0
16.1 - 20.0
Extension Cord Length
25' 50' 75' 100' 150'
18
18
18
18
18
18
16
14
12
18
18
16
14
12
10
18
16
14
12
10
18
16
14
12
10
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READ AND SAVE ALL
WARNING T o reduce the risk of injury ,
always unplug tool before attaching or removing accessories or making adjustments. Use
only specifi cally recommended accessories.
Others may be hazardous.
Attaching Feed Handle
1. T o attach, line up the anvil, press the center button and slide the handle into place on the desired
side of the tool.
2. To remove, press the center button and pull the
handle away from the tool.
Do not use a wrench, pipe, or any other lever in
place of the feed handle.
Motor adjustment lever
The motor adjustment lever is used to raise and
lower the motor on the slide rail. Always hold the
motor securely before loosening the adjustment
lever.
WARNING T o 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, fl at fi le to keep the magnet
16
14
12
12
--
--
--
clean and free of nicks.
The 4272-21 drill attaches to 3/8" or thicker
ferrous stock, and the 4274-21 to 1/4" or
thicker ferrous stock. Do not use on stock
less than 1/4". The magnetic base WILL NOT
hold on nonmagnetic grades of stainless steel.
2. To install/remove cutter:
A. Unplug tool.
B. Raise the drill motor to its highest position
on the slide rail.
C. Twist the quick-change arbor. Insert the cut-
ter into the arbor and release collar. Tug on
cutter to ensure it is secure. Cutter should
be fully seated into spindle.
D. 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.
ASSEMBLY
OPERATION
11
Cat. No. 4272-21
14
1312
4
5
NOTE: If the cutter does not release from the ar-
bor when the collar is turned, use a locking pliers
to grasp the cutter above the cutter fl utes. Hold-
ing the collar securely in one hand, rotate the pliers clockwise to release the cutter from the arbor.
WARNING T o reduce the risk of injury ,
do not hold workpiece by hand.
3. Select High Speed or Low Speed , depending on your application.
WARNING
• Do not use cutting fl uid in an overhead or
any other position that allows cutting fl uid
to enter motor or switch enclosure.
• Wet connections are shock haz-
ards. Prevent cutting fl uid 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. If plug or connections
get wet, turn power off to outlet before
unplugging tool.
For the 4272-21, position the tool so the center
4.
pin is directly over the desired cutting location.
Push the magnetic activation switch to engage
the magnet. The drill will not operate unless the
magnet is engaged.
For the 4274-21, position the tool so the center
pin is directly over the desired cutting location.
Rotate the magnet knob to engage the magnet.
The magnet icons will align . The drill will not
operate unless the magnet is engaged.
WARNING To reduce the risk of in-
jury, always use a safety strap on vertical,
overhead, and pipe applications. Mounting
can release.
5. Use a safety strap on vertical, overhead, and
pipe applications.
A. Route the safety strap, through the lower
slots, and wrap it tightly around a solid, rigid
structure. Make sure the strap is not twisted.
B. Snap the safety strap snaphooks together.
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. Do not clamp to the strap. This may
damage the strap and cause it to break.
WARNING Do not use cutting fl uid
in an overhead or any other position that
allows cutting fl uid to enter motor or switch
enclosure.
6. Plug in tool.
7. With the on(I) / off(O) switch in the off(O) position, place the rubber tube over the cutting fl uid
fi tting. Inject cutting fl uid into the rubber tube
using the supplied hand pump. Keep hand pump
and tube away from moving parts. Lubricate
well before starting, and throughout the cutting
operation as needed.
Failure to lubricate properly will cause cutter
damage. The use of HAWG W ASH® cutting fl uid
is recommended for long life of these cutters.
The operator is responsible for the application
of lubricants other than HAWG WASH® cutting
fl uid.
In overhead or vertical cutting applications, do
not use cutting fl uids. Use only lubricant pastes
or sprays recommended for high speed cutting.
Do not allow lubricant pastes and sprays to enter
tool.
WARNING To reduce the
risk of injury, always keep hands,
gloves, 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.
8. Start the drill motor by pulling
the on(I) / off(O) switch out, by
both sides, to the on(I) position.
The drill will not operate unless
the magnet is engaged.
6
WARNING Excessive force on the feed
handle will break magnet free.
9. Even large bits only require a small amount of
pressure on the feed handle.
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 notch-
ing because there is less support for the cutting
edges in these situations.
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 diffi cult or impos-
sible. Continue lubricating as necessary.
11. When the cut is complete, withdraw the cutter
while the spindle is still rotating.
12. Stop the drill motor by pushing in the on(I) / off(O)
switch.
13. When the 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.
The center pin is spring loaded. Provide protec-
tion from ejected slug for people and property
below cutting area.
15. Firmly grip the tool to disengaging the magnet.
For the 4272-21, push the magnet switch to
disengage. For the 4274-21, rotate the magnet
knob.
16. When drilling on pipe using the 4274-21, use
the accessory pipe adaptor 48-10-0130 and the
safety strap.
ACCESSORIES
WARNING To reduce the risk of injury ,
always unplug the tool before attaching or
removing accessories. Use only specifi cally
recommended accessories. Others may be
hazardous.
For a complete listing of accessories refer
to your MILWAUKEE catalog or go online to
www.milwaukeetool.com. To obtain a catalog, contact your local distributor or service center.
MAINTENANCE
WARNING T o reduce the risk of injury,
always unplug your tool before performing
any maintenance. Never disassemble the tool
or try to do any rewiring on the tool’s electrical
system. Contact a MILWAUKEE service facility
for ALL repairs.
Maintaining Tool
Keep your tool in good repair by adopting a regular
maintenance program. Before use, examine the
general condition of your tool. Inspect guards,
switches, tool cord set and extension cord for damage. Check for loose screws, misalignment, binding
of moving parts, improper mounting, broken parts
and any other condition that may affect its safe operation. If abnormal noise or vibration occurs, turn the
tool off immediately and have the problem corrected
before further use. Do not use a damaged tool.
Tag damaged tools “DO NOT USE” until repaired
(see “Repairs”).
Under normal conditions, relubrication is not necessary until the motor brushes need to be replaced.
After six months to one year, depending on use,
return your tool to the nearest MILWAUKEE service
facility for the following:
• Lubrication
• Brush inspection and replacement
• Mechanical inspection and cleaning (gears,
spindles, bearings, housing, etc.)
• Electrical inspection (switch, cord, armature, etc.)
• T esting to assure proper mechanical and electrical
operation
WARNING T o reduce the risk of injury,
electric shock and damage to the tool, never
immerse your tool in liquid or allow a liquid
to fl ow inside the tool.
Cleaning
Clean dust and debris from vents. Keep the tool
handles clean, dry and free of oil or grease. Use
only mild soap and a damp cloth to clean your tool
since certain cleaning agents and solvents are
harmful to plastics and other insulated parts. Some
of these include: gasoline, turpentine, lacquer thinner, paint thinner, chlorinated cleaning solvents,
ammonia and household detergents containing
ammonia. Never use fl ammable or combustible
solvents around tools.
Repairs
If your tool is damaged, return the entire tool to the
nearest service center.
7
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