Milwaukee 2784-20 Operator's Manual
Cat. No. / No de cat.
2784-20
M18™ FUEL™ DIE GRINDER
MEULE À RECTIFIER LES MATRICES FUEL™ M18™
AMOLADORA RECTA DE M18™ FUEL™
OPERATOR'S MANUAL
MANUEL de L'UTILISATEUR
MANUAL del OPERADOR
WARNING To reduce the risk of injury, user must read and understand operator's manual.
AVERTISSEMENT An de réduire le risque de blessures, l'utilisateur doit lire et bien
comprendre le manuel.
ADVERTENCIA Para reducir el riesgo de lesiones, el usuario debe leer y entender el manual.
2
GENERAL POWER TOOL
SAFETY WARNINGS
WARNING
Read all safety warnings, instructions, illustrations and specica-
tions provided with this power tool. Failure to
follow all instructions listed below may result in
electric shock, 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-oper-
ated (cordless) power tool.
WORK AREA SAFETY
• Keep work area clean and well lit. Cluttered or
dark areas invite accidents.
• Do not operate power tools in explosive atmo-
spheres, such as in the presence of 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
• 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. Unmodied 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. Water 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 inuence 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 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
balance 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.
BATTERY TOOL USE AND CARE
• Recharge only with the charger specied by the
manufacturer. A charger that is suitable for one type
of battery pack may create a risk of re when used
with another battery pack.
• Use power tools only with specically designated
battery packs. Use of any other battery packs may
create a risk of injury and re.
• When battery pack is not in use, keep it away
from other metal objects, like paper clips, coins,
keys, nails, screws or other small metal objects,
3
that can make a connection from one terminal
to another. Shorting the battery terminals together
may cause burns or a re.
• Under abusive conditions, liquid may be ejected
from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid
contacts eyes, additionally seek medical help.
Liquid ejected from the battery may cause irritation
or burns.
• Do not use a battery pack or tool that is damaged or modied. Damaged or modied batteries
may exhibit unpredictable behavior resulting in re,
explosion or risk of injury.
• Do not expose a battery pack or tool to re or
excessive temperature. Exposure to re or temperature above 265°F (130°C) may cause explosion.
• Follow all charging instructions and do not charge
the battery pack or tool outside the temperature
range specied in the instructions. Charging
improperly or at temperatures outside the specied
range may damage the battery and increase the risk
of re.
SERVICE
• Have your power tool serviced by a qualied
repair person using only identical replacement
parts. This will ensure that the safety of the power
tool is maintained.
• Never service damaged battery packs. Service
of battery packs should only be performed by the
manufacturer or authorized service providers.
SPECIFIC SAFETY RULES FOR
DIE GRINDERS
Safety Warnings Common for Grinding, Sanding,
Wire Brushing, Polishing, Carving or Abrasive
Cutting-Off Operations:
• This power tool is intended to function as a
grinder, sander, wire brush, polisher, carving
or cut-off tool. Read all safety warnings,
instructions, illustrations and specications
provided with this power tool. Failure to follow
all instructions listed below may result in electric
shock, re and/or serious injury.
• Do not use accessories which are not specically
designed and recommended by the tool
manufacturer. Just because the accessory can be
attached to your power tool, it does not assure safe
operation.
• The rated speed of the grinding accessory must
be at least equal to the maximum speed marked
on the power tool. Grinding accessories running
faster than their rated speed can break and y apart.
• The outside diameter and the thickness of your
accessory must be within the capacity rating
of your power tool. Incorrectly sized accessories
cannot be adequately controlled.
• The arbour size of wheels, sanding drum or any
other accessory must properly t the spindle or
collet of the power tool. Accessories that do not
match the mounting hardware of the power tool will
run out of balance, vibrate excessively and may
cause loss of control.
• Mandrel mounted wheels, sanding drums,
cutters or other accessories must be fully
inserted into the collet or chuck. If the mandrel is
insufciently held and/or the overhang of the wheel
is too long, the mounted wheel may become loose
and ejected at high velocity.
• Do not use a damaged accessory. Before each
use inspect the accessory such as abrasive
wheels for chips and cracks, sanding drum
for cracks, tear or excess wear, wire brush for
loose or cracked wires. If power tool or accessory is dropped, inspect for damage or install
an undamaged accessory. After inspecting and
installing an accessory, position yourself and
bystanders away from the plane of the rotating
accessory and run the power tool at maximum
no-load speed for one minute. Damaged acces-
sories will normally break apart during this test time.
• Wear personal protective equipment. Depending
on application, use face shield, safety goggles or
safety glasses. As appropriate, wear dust mask,
hearing protectors, gloves and workshop apron
capable of stopping small abrasive or workpiece
fragments. The eye protection must be capable of
stopping ying debris generated by various operations. The dust mask or respirator must be capable
of ltrating particles generated by your operation.
Prolonged exposure to high intensity noise may
cause hearing loss.
• Keep bystanders a safe distance away from work
area. Anyone entering the work area must wear
personal protective equipment. Fragments of
workpiece or of a broken accessory may y away and
cause injury beyond immediate area of operation.
• Hold power tool by insulated gripping surfaces
only, when performing an operation where the
cutting accessory may contact hidden wiring.
Cutting accessory contacting a "live" wire may make
exposed metal parts of the power tool "live" and
could give the operator an electric shock.
• Always hold the tool rmly in your hands during
the start-up. The reaction torque of the motor, as it
accelerates to full speed, can cause the tool to twist.
• Use clamps to support workpiece whenever
practical. Never hold a small workpiece in one
hand and the tool in the other hand while in use.
Clamping a small workpiece allows you to use both
hands to control the tool. Round material such as
dowel rods, pipes or tubing have a tendency to roll
while being cut, and may cause the bit to bind or
jump toward you.
• Never lay the power tool down until the accessory has come to a complete stop. The spinning
accessory may grab the surface and pull the power
tool out of your control.
• After changing the bits or making any adjustments, make sure the collet nut, chuck or any
other adjustment devices are securely tightened.
Loose adjustment devices can unexpectedly shift,
causing loss of control, loose rotating components
will be violently thrown.
• Do not run the power tool while carrying it at
your side. Accidental contact with the spinning
accessory could snag your clothing, pulling the ac-
cessory into your body.
• Regularly clean the power tool’s air vents. The
motor’s fan will draw the dust inside the housing
and excessive accumulation of powdered metal
may cause electrical hazards.
• Do not operate the power tool near ammable
materials. Sparks could ignite these materials.
• Do not use accessories that require liquid coolants. Using water or other liquid coolants may result
in electrocution or shock.
4
• Do not position your hand in line with and behind
the rotating wheel. When the wheel, at the point
of operation, is moving away from your hand, the
possible kickback may propel the spinning wheel
and the power tool directly at you.
• When wheel is pinched, snagged or when interrupting a cut for any reason, switch off the
power tool and hold the power tool motionless
until the wheel comes to a complete stop. Never
attempt to remove the cut-off wheel from the cut
while the wheel is in motion otherwise kickback
may occur. Investigate and take corrective action
to eliminate the cause of wheel binding.
• Do not restart the cutting operation in the
workpiece. Let the wheel reach full speed and
carefully reenter the cut. The wheel may bind,
walk up or kickback if the power tool is restarted in
the workpiece.
• Support panels or any oversized workpiece to
minimize the risk of wheel pinching and kickback. Large workpieces tend to sag under their
own weight. Supports must be placed under the
workpiece near the line of cut and near the edge of
the workpiece on both sides of the wheel.
• Use extra caution when making a “pocket cut”
into existing walls or other blind areas. The protruding wheel may cut gas or water pipes, electrical
wiring or objects that can cause kickback.
Safety Warnings Specific for Wire Brushing
Operations:
• Be aware that wire bristles are thrown by the
brush even during ordinary operation. Do not
overstress the wires by applying excessive load
to the brush. The wire bristles can easily penetrate
light clothing and/or skin.
• Allow brushes to run at operating speed for at
least one minute before using them. During this
time no one is to stand in front or in line with the
brush. Loose bristles or wires will be discharged
during the run-in time.
• Direct the discharge of the spinning wire brush
away from you. Small particles and tiny wire fragments may be discharged at high velocity during the
use of these brushes and may become imbedded
in your skin.
Additional Safety Warnings
• 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 sand-
ing, sawing, grinding, drilling, and
other construction activities contains chemicals
known to cause cancer, birth defects or other repro-
ductive 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 spe-
cially designed to lter out microscopic particles.
Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or
snagged rotating wheel, sanding band, brush or
any other accessory. Pinching or snagging causes
rapid stalling of the rotating accessory which in turn
causes the uncontrolled power tool to be forced in
the direction opposite of the accessory’s rotation. For
example, if an abrasive wheel is snagged or pinched
by the workpiece, the edge of the wheel that is entering into the pinch point can dig into the surface of the
material causing the wheel to climb out or kick out.
The wheel may either jump toward or away from the
operator, depending on direction of the wheel’s move-
ment at the point of pinching. Abrasive wheels may
also break under these conditions. Kickback is the
result of power tool misuse and/or incorrect operat-
ing procedures or conditions and can be avoided by
taking proper precautions as given below.
• Maintain a rm grip on the power tool and position your body and arm to allow you to resist
kickback forces. The operator can control kickback
forces, if proper precautions are taken.
• Use special care when working corners, sharp
edges etc. Avoid bouncing and snagging the accessory. Corners, sharp edges or bouncing have a
tendency to snag the rotating accessory and cause
loss of control or kickback.
• Do not attach a toothed saw blade. Such blades
create frequent kickback and loss of control.
• Always feed the bit into the material in the same
direction as the cutting edge is exiting from the
material (which is the same direction as the
chips are thrown). Feeding the tool in the wrong
direction causes the cutting edge of the bit to climb
out of the work and pull the tool in the direction of
this feed.
• When using rotary les, cut-off wheels, highspeed cutters or tungsten carbide cutters,
always have the work securely clamped. These
wheels will grab if they become slightly canted in
the groove, and can kickback. When a cut-off wheel
grabs, the wheel itself usually breaks. When the
rotary le, high-speed cutters or tungsten carbide
cutter grabs, it may jump from the groove and you
could lose control of the tool.
Safety Warnings Specic for Grinding and Abrasive Cutting-Off Operations:
• Use only wheel types that are recommended
for your power tool and only for recommended
applications. For example: do not grind with the
side of a cut-off wheel. Abrasive cut-off wheels are
intended for peripheral grinding, side forces applied
to these wheels may cause them to shatter.
• For threaded abrasive cones and plugs use only
undamaged wheel mandrels with an unrelieved
shoulder ange that are of correct size and
length. Proper mandrels will reduce the possibility
of breakage.
• Do not “jam” a cut-off wheel or apply excessive
pressure. Do not attempt to make an excessive
depth of cut. Overstressing the wheel increases the
loading and susceptibility to twisting or snagging of
the wheel in the cut and the possibility of kickback
or wheel breakage.
5
SPECIFICATIONS
Cat. No. ..................................................... 2784-20
Volts.............................................................. 18 DC
Battery Type .................................................M18™
Charger Type....................................................M18
Recommended Ambient
Operating Temperature .................... 0°F to 125°F
Rated RPM ...................................................20,000
Max Wheel Ø .........................................2" (55 mm)
Max Flap Disk Ø ....................................3" (76 mm)
SYMBOLOGY
Volts
Direct Current
Rated Revolutions per Minute (RPM)
Read Operator's Manual
Wear Eye Protection
C
US
UL Listing for Canada and U.S.
FUNCTIONAL DESCRIPTION
3
2
1
1. Collet nut
2. Slide switch
3. Handle
4. Dust screen
5. 11/16" wrench (not shown)
6. 1/2" wrench (not shown)
7. 1/4" collet (not shown)
4
ASSEMBLY
WARNING
Recharge only with the charger
specied for the battery. For specic charging instructions, read the operator’s
manual supplied with your charger and battery.
Removing/Inserting the Battery
To remove the battery, push in the release buttons
and pull the battery pack away from the tool.
WARNING
Always remove battery pack before
changing or removing accessories.
To insert the battery, slide the pack into the body
of the tool. Make sure it latches securely into place.
WARNING
Only use accessories specically
recommended for this tool. Others
may be hazardous.
Accessories
Points, cones, plugs, grinding wheels and cut-off
wheels should be protected from:
• wetness and extreme humidity
• any type of solvent
• extreme changes in temperature
• dropping and bumping
Points, cones, plugs, grinding wheels and cut-off
wheels should be stored:
• in an organized way so points, cones, plugs or
wheels can be removed without disturbing or damaging other points, cones, plugs or wheels
• with their safety information
Points, cones, plugs, grinding wheels and cut-off
wheels should NOT be dropped, rolled or bumped.
Discard points, cones, plugs, or wheels that have
been dropped, rolled, bumped, subjected to extreme
changes in temperature, or come into contact with
solvents or wetness.
Installing Collets
The collet must be attached to the collet nut before
installing the collet asembly to the tool. Be sure that
the collet size matches the size of the mandrel you
will use, otherwise the collet may break.
1. To assemble, place collet on an even surface, and
place the nut over the collet.
2. Press down on the nut to snap the nut and collet
together.
3. To disassemble, use a rod to push the collet out
of the nut.
6
Installing Accessories
1. Remove dust and debris from the collet body
before inserting accessory.
2. Insert the collet with the collet nut attached into the
collet body. Thread the collet nut onto the spindle
but do not tighten it yet.
3. Clean the accessory mandrel, then insert it a
minimum of 3/4" into the collet. The mandrel will
overhang the collet and the accessory about 1/2".
Insert mandrel
a minimum of 3/4" inside the collet
Overhang about 1/2"
Accessory
Mandrel
Collet
4. Hold the spindle shaft steady with
a 1/2" open end wrench and se-
curely tighten the collet nut with an
11/16" open end wrench.
5. Reverse the procedure when
removing the accessory.
WARNING
To reduce the risk of injury, always
securely tighten the collet to the
grinders and clean mandrels before inserting
them into the collet. Otherwise the high-speed
rotation of the tool could force the accessory to
y out of the collet.
Installing/Removing/Cleaning
the Dust Screen
Using the dust screen will increase the performance
and extend the life of the tool.
1. To attach the dust screen, snap the screen over
the tool’s handle.
2. To remove the dust screen, insert a at screw-
driver into the notch at the top of the dust screen
and pry away from the tool.
3. To clean the dust screen, tap against a hard sur-
face, or blow clean with compressed air.
OPERATION
WARNING
To reduce the risk of injury,
always
remove battery pack
before attach-
ing or removing accessories or making adjust-
ments. Only use accessories specically recommended for this tool. Others may be hazardous.
To reduce the risk of injury, always wear safety
goggles or glasses with side shields.
If the grinder begins vibrating, immediately stop
the motor and check to see if the accessory is dull.
Dull accessories will cause the tool to vibrate and
could force the collet to y off the tool. Always
replace or sharpen dull accessories.
Accessories are design for specic uses. Only use
points, cones, plugs, grinding wheels and cut-off
wheels for applications for which they were designed.
Follow manufacturer's care and use instructions.
General Operation
1. If you have just installed an accessory or are
beginning a period of work, test it by letting it spin
for one minute before applying it to the workpiece.
WARNING! Never use an accessory that has been
dropped. Out-of-balance or damaged accessories
can mar workpiece, damage the tool, and cause
stress that may cause accessory failure.
2. Use a clamp, vise or other practical means to hold
your work, freeing both hands to control the tool.
3. WARNING! Hold tool securely with both hands.
Start the tool.
4. To start the tool, grasp the handle
and side handle rmly and slide
the switch to ON.
5. Allow accessory to come to full
speed before beginning work.
6. Control pressure and surface contact between accessory and workpiece. WARNING! Never bang
accessories onto work.Too much pressure causes
accessory failure or slows speed.
7.
To stop the tool, release the switch. Make sure the tool
comes to a complete stop before laying the tool down.
8. To loc
k-on the switch, slide the switch to ON and
press down on the front of the switch. To stop the
tool, press and release the switch. Make sure the tool
comes to a complete stop before laying down the tool.
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