DeWalt XR LI-ION DCG412 User manual

DCG412
Final page size: A5 (148mm x 210mm)

B
Copyright DeWALT
English 4
简体中文 21
한국어 35

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Definitions: Safety Guidelines
The definitions below describe the level of severity for each
signal word. Please read the manual and pay attention to
thesesymbols.
DANGER: Indicates an imminently hazardous
situation which, if not avoided, will result in death or
seriousinjury.
WARNING: Indicates a potentially hazardous situation
which, if not avoided, could result in death or
seriousinjury.
CAUTION: Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderateinjury.
NOTICE: Indicates a practice not related to
personal injury which, if not avoided, may result in
propertydamage.
Denotes risk of electricshock.
Denotes risk offire.
Congratulations!
You have chosen a DeWALT tool. Years of experience, thorough
product development and innovation make DeWALT one of the
most reliable partners for professional power toolusers.
Technical Data
DCG412
Voltage VDC 18 (20 Max)
Battery type Li-Ion
Power input W405
No-load/rated speed min-1 8000
Wheel diameter mm 125
Wheel thickness (max) mm 6
Spindle diameter M10/M14
Spindle length mm 16
Weight (without battery pack) kg 1.9*
* weight includes side handle and guard
WARNING: To reduce the risk of injury, read the
instructionmanual.
CORDLESS GRINDER
DCG412
Batteries Chargers / Charge Times (Minutes)
Cat# VDC Ah Weight(kg) DCB104 DCB107 DCB112 DCB113 DCB115 DCB118 DCB132 DCB119
DCB546 18/54
(20/60 MAX) 6.0/2.0 1.05 60 270 170 140 90 60 90 X
DCB547 18/54
(20/60 MAX) 9.0/3.0 1.46 75* 420 270 220 135* 75* 135* X
DCB548 18/54
(20/60 MAX) 12.0/4.0 1.44 120 540 350 300 180 120 180 X
DCB181 18
(20 MAX) 1.5 0.35 22 70 45 35 22 22 22 45
DCB182 18
(20 MAX) 4.0 0.61 60/40** 185 120 100 60 60/40** 60 120
DCB183/B 18
(20 MAX) 2.0 0.40 30 90 60 50 30 30 30 60
DCB184/B 18
(20 MAX) 5.0 0.62 75/50** 240 150 120 75 75/50** 75 150
DCB185 18
(20 MAX) 1.3 0.35 22 60 40 30 22 22 22 X
DCB187 18
(20 MAX) 3.0 0.54 45 140 90 70 45 45 45 90
DCB189 18
(20 MAX) 4.0 0.54 60 185 120 100 60 60 60 120
GENERAL POWER TOOL SAFETY WARNINGS
WARNING: Read all safety warnings, instructions,
illustrations and specifications provided with this
power tool. Failure to follow all instructions listed below
may result in electric shock, fire 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.

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1) Work Area Safety
a ) Keep work area clean and well lit. Cluttered or dark
areas inviteaccidents.
b ) 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.
c ) Keep children and bystanders away while operating
a power tool. Distractions can cause you to losecontrol.
2) Electrical Safety
a ) 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.
b ) 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.
c ) Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of
electricshock.
d ) 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.
e ) 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.
f ) If operating a power tool in a damp location is
unavoidable, use a residual current device (RCD)
protected supply. Use of an RCD reduces the risk of
electricshock.
3) Personal Safety
a ) 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.
b ) 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.
c ) 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 finger on the
switch or energising power tools that have the switch on
invitesaccidents.
d ) 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.
e ) Do not overreach. Keep proper footing and balance
at all times. This enables better control of the power tool
in unexpectedsituations.
f ) Dress properly. Do not wear loose clothing or
jewellery. Keep your hair and clothing away from
moving parts. Loose clothes, jewellery or long hair can be
caught in movingparts.
g ) 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.
h ) 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.
4) Power Tool Use and Care
a ) 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.
b ) 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.
c ) 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.
d ) 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.
e ) 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.
f ) Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges are less
likely to bind and are easier tocontrol.
g ) 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.
h ) 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.
5) Battery Tool Use and Care
a ) Recharge only with the charger specified by the
manufacturer. A charger that is suitable for one type
of battery pack may create a risk of fire when used with
another batterypack.

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b ) Use power tools only with specifically designated
battery packs. Use of any other battery packs may create
a risk of injury andfire.
c ) 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, that can
make a connection from one terminal to another.
Shorting the battery terminals together may cause burns
or afire.
d ) 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.
e ) Do not use a battery pack or tool that is damaged
or modified. Damaged or modified batteries may exhibit
unpredictable behaviour resulting in fire, explosion or risk
of injury.
f ) Do not expose a battery pack or tool to fire or
excessive temperature. Exposure to fire or temperature
above 130 °C may causeexplosion.
g ) Follow all charging instructions and do not charge
the battery pack or tool outside the temperature
range specified in the instructions. Charging
improperly or at temperatures outside the specified range
may damage the battery and increase the risk of fire.
6) Service
a ) 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.
b ) Never service damaged battery packs. Service
of battery packs should only be performed by the
manufacturer or authorized service providers.
ADDITIONAL SPECIFIC SAFETY RULES
Safety Instructions for All Operations
a ) This power tool is intended to function as a grinder,
wire brush or cut-off tool. Read all safety warnings,
instructions, illustrations and specifications
provided with this power tool. Failure to follow all
instructions listed below may result in electric shock, fire
and/or seriousinjury.
b ) Operations such as sanding and polishing are not
recommended to be performed with this power tool.
Operations for which the power tool was not designed
may create ahazard and cause personalinjury.
c ) Do not use accessories which are not specifically
designed and recommended by the tool
manufacturer. Just because the accessory can
be attached to your power tool, it does not assure
safeoperation.
d ) The rated speed of the accessory must be at least
equal to the maximum speed marked on the power
tool. Accessories running faster than their rated speed can
break and flyapart.
e ) The outside diameter and the thickness of your
accessory must be within the capacity rating of
your power tool. Incorrectly sized accessories can not be
adequately guarded orcontrolled.
f ) Threaded mounting of accessories must match the
grinder spindle thread. For accessories mounted by
flanges, the arbour hole of the accessory must fit the
locating diameter of the flange. 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.
g ) Do not use a damaged accessory. Before each use
inspect the accessory such as abrasive wheel for
chips and cracks, backing pad 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
accessories will normally break apart during this testtime.
h ) 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 flying
debris generated by various operations. The dust mask or
respirator must be capable of filtrating particles generated
by your operation. Prolonged exposure to high intensity
noise may cause hearingloss.
i ) 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 fly away and
cause injury beyond immediate area ofoperation.
j ) Hold power tool by insulated gripping surfaces only,
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 electricalshock.
k ) Position the cord clear of the spinning accessory. If
you lose control, the cord may be cut or snagged and your
hand or arm may be pulled into the spinningaccessory.
l ) 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.
m ) Do not run the power tool while carrying it at your
side. Accidental contact with the spinning accessory could
snag your clothing, pulling the accessory into yourbody.
n ) Regularly clean the power tool’s air vents. The
motor’s fan will draw the dust inside the housing and

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excessive accumulation of powdered metal may cause
electricalhazards.
o ) Do not operate the power tool near flammable
materials. Sparks could ignite thesematerials.
p ) Do not use accessories that require liquid coolants.
Using water or other liquid coolants may result in
electrocution orshock.
q ) Do not use Type 11 (flaring cup) wheels on this tool.
Using inappropriate accessories can result ininjury.
r ) Always use side handle. Tighten the handle securely.
The side handle should always be used to maintain control
of the tool at alltimes.
WARNING: We recommend the use of a residual current
device with a residual current rating of 30mA orless.
FURTHER SAFETY INSTRUCTIONS FOR ALL
OPERATIONS
Causes and Operator Prevention
of Kickback
Kickback is a sudden reaction to a pinched or snagged rotating
wheel, backing pad, 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 at the point of
thebinding.
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
movement at the point of pinching. Abrasive wheels may also
break under theseconditions.
Kickback is the result of power tool misuse and/or incorrect
operating procedures or conditions and can be avoided by taking
proper precautions as given BELOW:
a ) Maintain a firm grip on the power tool and position
your body and arm to allow you to resist kickback
forces. Always use auxiliary handle, if provided, for
maximum control over kickback or torque reaction
during start-up. The operator can control torque reaction
or kickback forces, if proper precautions aretaken.
b ) Never place your hand near the rotating accessory.
Accessory may kickback over yourhand.
c ) Do not position your body in the area where power
tool will move if kickback occurs. Kickback will propel
the tool in direction opposite to the wheel’s movement at
the point ofsnagging.
d ) 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.
e ) Do not attach a saw chain woodcarving blade or
toothed saw blade. Such blades create frequent kickback
and loss ofcontrol.
Safety Warnings Specific for Grinding and
Abrasive Cutting-Off Operations
a ) Use only wheel types that are recommended for your
power tool and the specific guard designed for the
selected wheel. Wheels for which the power tool was not
designed cannot be adequately guarded and areunsafe.
b ) The grinding surface of centre depressed wheels
must be mounted below the plane of the guard lip.
An improperly mounted wheel that projects through the
plane of the guard lip cannot be adequatelyprotected.
c ) The guard must be securely attached to the power
tool and positioned for maximum safety, so the least
amount of wheel is exposed towards the operator.
The guard helps to protect the operator from broken wheel
fragments and accidental contact with wheel and sparks
that could igniteclothing.
d ) Wheels must be used only for recommended
applications. For example: do not grind with the side
of cut-off wheel. Abrasive cut-off wheels are intended
for peripheral grinding, side forces applied to these wheels
may cause them toshatter.
e ) Always use undamaged wheel flanges that are
of correct size and shape for your selected wheel.
Proper wheel flanges support the wheel thus
reducing the possibility of wheel breakage. Flanges
for cut-off wheels may be different from grinding
wheelflanges.
f ) Do not use worn down wheels from larger power
tools. Wheel intended for larger power tool is not suitable
for the higher speed of a smaller tool and mayburst.
Additional Safety Warnings Specific for
Abrasive Cutting-Off Operations
a ) Do not “jam” the 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 binding of the wheel in the cut
and the possibility of kickback or wheelbreakage.
b ) Do not position your body in line with and behind
the rotating wheel. When the wheel, at the point of
operations, is moving away from your body, the possible
kickback may propel the spinning wheel and the power
tool directly atyou.
c ) When wheel is binding 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.

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d ) Do not restart the cutting operation in the
workpiece. Let the wheel reach full speed and
carefully re-enter the cut. The wheel may bind, walk up
or kickback if the power tool is restarted in theworkpiece.
e ) Support panels or any oversized workpiece to
minimise 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.
f ) 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
a ) 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.
b ) If the use of a guard is recommended for wire
brushing, do not allow any interference of the
wire wheel or brush with the guard. Wire wheel
or brush may expand in diameter due to work and
centrifugalforces.
Residual Risks
In spite of the application of the relevant safety regulations
and the implementation of safety devices, certain residual risks
cannot be avoided. These are:
• Impairment ofhearing.
• Risk of personal injury due to flyingparticles.
• Risk of burns due to accessories becoming hot
duringoperation.
• Risk of personal injury due to prolongeduse.
SAVE THESE INSTRUCTIONS
Chargers
DeWALT chargers require no adjustment and are designed to be
as easy as possible tooperate.
Electrical Safety
The electric motor has been designed for one voltage only.
Always check that the battery pack voltage corresponds to the
voltage on the rating plate. Also make sure that the voltage of
your charger corresponds to that of yourmains.
Your DeWALT charger is double insulated in
accordance with IEC60335; therefore no earth wire
isrequired.
If the supply cord is damaged, it must be replaced only by
DeWALT or an authorised serviceorganisation.
Using an Extension Cable
An extension cord should not be used unless absolutely
necessary. Use an approved extension cable suitable for
the power input of your charger (see Technical Data). The
minimum conductor size is 1mm2; the maximum length
is30m.
When using a cable reel, always unwind the cablecompletely.
Important Safety Instructions for All Battery
Chargers
SAVE THESE INSTRUCTIONS: This manual contains important
safety and operating instructions for compatible battery
chargers (refer to TechnicalData).
• Before using charger, read all instructions and cautionary
markings on charger, battery pack, and product using
batterypack.
WARNING: Shock hazard. Do not allow any liquid to get
inside charger. Electric shock mayresult.
WARNING: We recommend the use of a residual current
device with a residual current rating of 30mA orless.
CAUTION: Burn hazard. To reduce the risk of injury,
charge only DeWALT rechargeable batteries. Other types of
batteries may burst causing personal injury anddamage.
CAUTION: Children should be supervised to ensure that
they do not play with theappliance.
NOTICE: Under certain conditions, with the charger
plugged into the power supply, the exposed charging
contacts inside the charger can be shorted by foreign
material. Foreign materials of a conductive nature such as,
but not limited to, steel wool, aluminum foil or any buildup
of metallic particles should be kept away from charger
cavities. Always unplug the charger from the power supply
when there is no battery pack in the cavity. Unplug charger
before attempting to clean
• DO NOT attempt to charge the battery pack with any
chargers other than the ones in this manual. The charger
and battery pack are specifically designed to worktogether.
• These chargers are not intended for any uses other than
charging DeWALT rechargeable batteries. Any other uses
may result in risk of fire, electric shock orelectrocution.
• Do not expose charger to rain orsnow.
• Pull by plug rather than cord when disconnecting
charger. This will reduce risk ofdamage to electric plug
andcord.
• Make sure that cord is located so that it will not be
stepped on, tripped over, or otherwise subjected to
damage orstress.
• Do not use an extension cord unless it is absolutely
necessary. Use of improper extension cord could result in risk
of fire,electric shock, orelectrocution.
• Do not place any object on top of charger or place
the charger on a soft surface that might block the
ventilation slots and result in excessive internal heat.
Place the charger in a position away from any heat source. The
charger is ventilated through slots in the top and the bottom
of thehousing.
• Do not operate charger with damaged cord or plug—
have them replacedimmediately.

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• Do not operate charger if it has received a sharp blow,
been dropped, or otherwise damaged in any way. Take it
to an authorised servicecentre.
• Do not disassemble charger; take it to an authorised
service centre when service or repair is required. Incorrect
reassembly may result in a risk of electric shock, electrocution
orfire.
• In case of damaged power supply cord the supply cord must be
replaced immediately by the manufacturer, its service agent or
similar qualified person to prevent anyhazard.
• Disconnect the charger from the outlet before
attempting any cleaning. This will reduce the risk of
electric shock. Removing the battery pack will not reduce
thisrisk.
• NEVER attempt to connect two chargerstogether.
• The charger is designed to operate on standard 220-
240V household electrical power. Do not attempt to
use it on any other voltage. This does not apply to the
vehicularcharger.
Charging a Battery (Fig. B)
1. Plug the charger into an appropriate outlet before inserting
batterypack.
2. Insert the battery pack10 into the charger, making sure the
battery pack is fully seated in the charger. The red (charging)
light will blink repeatedly indicating that the charging
process hasstarted.
3. The completion of charge will be indicated by the red light
remaining ON continuously. The battery pack is fully charged
and may be used at this time or left in the charger. To
remove the battery pack from the charger, push the battery
release button11 on the batterypack.
NOTE: To ensure maximum performance and life of lithium-ion
battery packs, charge the battery pack fully before firstuse.
Charger Operation
Refer to the indicators below for the charge status of the
batterypack.
Charge Indicators
Charging
Fully Charged
Hot/Cold Pack Delay*
*The red light will continue to blink, but a yellow indicator light
will be illuminated during this operation. Once the battery pack
has reached an appropriate temperature, the yellow light will
turn off and the charger will resume the chargingprocedure.
The compatible charger(s) will not charge a faulty battery pack.
The charger will indicate faulty battery by refusing tolight.
NOTE: This could also mean a problem with acharger.
If the charger indicates a problem, take the charger and battery
pack to be tested at an authorised servicecentre.
Hot/Cold Pack Delay
When the charger detects a battery pack that is too hot or too
cold, it automatically starts a Hot/Cold Pack Delay, suspending
charging until the battery pack has reached an appropriate
temperature. The charger then automatically switches to the
pack charging mode. This feature ensures maximum battery
packlife.
A cold battery pack will charge at a slower rate than a warm
battery pack. The battery pack will charge at that slower rate
throughout the entire charging cycle and will not return to
maximum charge rate even if the battery packwarms.
The DCB118 charger is equipped with an internal fan designed
to cool the battery pack. The fan will turn on automatically when
the battery pack needs to be cooled. Never operate the charger
if the fan does not operate properly or if ventilation slots are
blocked. Do not permit foreign objects to enter the interior of
thecharger.
Electronic Protection System
XR Li-Ion tools are designed with an Electronic Protection
System that will protect the battery pack against overloading,
overheating or deepdischarge.
The tool will automatically turn off if the Electronic Protection
System engages. If this occurs, place the lithium-ion battery
pack on the charger until it is fullycharged.
Wall Mounting
These chargers are designed to be wall mountable or to sit
upright on a table or work surface. If wall mounting, locate the
charger within reach of an electrical outlet, and away from a
corner or other obstructions which may impede air flow. Use
the back of the charger as a template for the location of the
mounting screws on the wall. Mount the charger securely using
drywall screws (purchased separately) at least 25.4mm long
with a screw head diameter of 7–9mm, screwed into wood to
an optimal depth leaving approximately 5.5mm of the screw
exposed. Align the slots on the back of the charger with the
exposed screws and fully engage them in theslots.
Charger Cleaning Instructions
WARNING: Shock hazard. Disconnect the charger
from the AC outlet before cleaning. Dirt and grease
may be removed from the exterior of the charger using a
cloth or soft non-metallic brush. Do not use water or any
cleaning solutions. Never let any liquid get inside the tool;
never immerse any part of the tool into aliquid.
Battery Packs
Important Safety Instructions for All Battery
Packs
When ordering replacement battery packs, be sure to include
catalogue number andvoltage.
The battery pack is not fully charged out of the carton. Before
using the battery pack and charger, read the safety instructions
below. Then follow charging proceduresoutlined.
READ ALL INSTRUCTIONS

10
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• Do not charge or use battery in explosive atmospheres,
such as in the presence of flammable liquids, gases or
dust. Inserting or removing the battery from the charger may
ignite the dust orfumes.
• Never force battery pack into charger. Do not modify
battery pack in any way to fit into a non-compatible
charger as battery pack may rupture causing serious
personalinjury.
• Charge the battery packs only in DeWALTchargers.
• DO NOT splash or immerse in water or otherliquids.
• Do not store or use the tool and battery pack in
locations where the temperature may reach or exceed
40 ˚C (104 ˚F) (such as outside sheds or metal buildings
in summer).
• Do not incinerate the battery pack even if it is severely
damaged or is completely worn out. The battery pack can
explode in a fire. Toxic fumes and materials are created when
lithium-ion battery packs areburned.
• If battery contents come into contact with the skin,
immediately wash area with mild soap and water. If
battery liquid gets into the eye, rinse water over the open eye
for 15 minutes or until irritation ceases. If medical attention
is needed, the battery electrolyte is composed of a mixture of
liquid organic carbonates and lithiumsalts.
• Contents of opened battery cells may cause respiratory
irritation. Provide fresh air. If symptoms persists, seek
medicalattention.
WARNING: Burn hazard. Battery liquid may be flammable
if exposed to spark orflame.
WARNING: Never attempt to open the battery pack for
any reason. If battery pack case is cracked or damaged,
do not insert into charger. Do not crush, drop or damage
battery pack. Do not use a battery pack or charger that
has received a sharp blow, been dropped, run over or
damaged in any way (i.e., pierced with a nail, hit with
a hammer, stepped on). Electric shock or electrocution
may result. Damaged battery packs should be returned to
service centre forrecycling.
WARNING: Fire hazard. Do not store or carry the
battery pack so that metal objects can contact
exposed battery terminals. For example, do not place
the battery pack in aprons, pockets, tool boxes, product kit
boxes, drawers, etc., with loose nails, screws, keys,etc.
CAUTION: When not in use, place tool on its side on
a stable surface where it will not cause a tripping
or falling hazard. Some tools with large battery packs
will stand upright on the battery pack but may be easily
knockedover.
Transportation
WARNING: Fire hazard. Transporting batteries can
possibly cause fire if the battery terminals inadvertently
come in contact with conductive materials. When
transporting batteries, make sure that the battery
terminals are protected and well insulated from materials
that could contact them and cause a shortcircuit.
NOTE: Lithium-ion batteries should not be put in
checkedbaggage.
DeWALT batteries comply with all applicable shipping
regulations as prescribed by industry and legal standards which
include UN Recommendations on the Transport of Dangerous
Goods; International Air Transport Association (IATA) Dangerous
Goods Regulations, International Maritime Dangerous Goods
(IMDG) Regulations, and the European Agreement Concerning
The International Carriage of Dangerous Goods by Road (ADR).
Lithium-ion cells and batteries have been tested to section 38.3
of the UN Recommendations on the Transport of Dangerous
Goods Manual of Tests andCriteria.
In most instances, shipping a DeWALT battery pack will be
excepted from being classified as a fully regulated Class 9
Hazardous Material. In general, only shipments containing a
lithium-ion battery with an energy rating greater than 100 Watt
Hours (Wh) will require being shipped as fully regulated Class 9.
All lithium-ion batteries have the Watt Hour rating marked on
the pack. Furthermore, due to regulation complexities, DeWALT
does not recommend air shipping lithium-ion battery packs
alone regardless of Watt Hour rating. Shipments of tools with
batteries (combo kits) can be air shipped as excepted if the Watt
Hour rating of the battery pack is no greater than 100Whr.
Regardless of whether a shipment is considered excepted
or fully regulated, it is the shipper's responsibility to consult
the latest regulations for packaging, labeling/marking and
documentationrequirements.
The information provided in this section of the manual is
provided in good faith and believed to be accurate at the time
the document was created. However, no warranty, expressed or
implied, is given. It is the buyer’s responsibility to ensure that its
activities comply with the applicableregulations.
Transporting the FLEXVOLTTM Battery
The DeWALT FLEXVOLTTM battery has two modes: Use
andTransport.
Use Mode: When the FLEXVOLTTM battery stands alone or is
in a DeWALT 18V (20V Max) product, it will operate as an 18V
(20V Max) battery. When the FLEXVOLTTM battery is in a 54V
(60V Max) or a 108V (120V Max) (two 54V (60V Max) batteries)
product, it will operate as a 54V (60V Max)battery.
Transport Mode: When the cap is attached to the FLEXVOLTTM
battery, the battery is in Transport mode. Keep the cap for
shipping.
When in Transport mode,
strings of cells are electrically
disconnected within the pack
resulting in 3 batteries with a
lower Watt hour (Wh) rating as compared to 1 battery with a
higher Watt hour rating. This increased quantity of 3 batteries
with the lower Watt hour rating can exempt the pack from
certain shipping regulations that are imposed upon the higher
Watt hour batteries.
For example, the Transport Example of Use and Transport Label Marking
Wh rating might indicate
3x36 Wh, meaning 3

11
ENGLISH
batteries of 36 Wh each. The Use Wh rating might indicate
108Wh (1battery implied).
Storage Recommendations
1. The best storage place is one that is cool and dry away
from direct sunlight and excess heat or cold. For optimum
battery performance and life, store battery packs at room
temperature when not inuse.
2. For long storage, it is recommended to store a fully charged
battery pack in a cool, dry place out of the charger for
optimalresults.
NOTE: Battery packs should not be stored completely depleted
of charge. The battery pack will need to be recharged beforeuse.
Labels on Charger and Battery Pack
In addition to the pictographs used in this manual, the labels
on the charger and the battery pack may show the following
pictographs:
Read instruction manual beforeuse.
See Technical Data for chargingtime.
Do not probe with conductiveobjects.
Do not charge damaged batterypacks.
Do not expose to water.
Have defective cords replacedimmediately.
Charge only between 4 ˚C and 40 ˚C.
Only for indooruse.
Discard the battery pack with due care for
theenvironment.
Charge DeWALT battery packs only with designated
DeWALT chargers. Charging battery packs other than
the designated DeWALT batteries with a DeWALT
charger may make them burst or lead to other
dangeroussituations.
Do not incinerate the batterypack.
USE (without transport cap). Example: Wh rating
indicates 108 Wh (1 battery with 108 Wh).
TRANSPORT (with built-in transport cap). Example:
Wh rating indicates 3 x 36 Wh (3batteries of 36 Wh).
Battery Type
The DCG412 operates on a 18 volt (20V Max) batterypack.
These battery packs may be used: DCB181, DCB182, DCB183,
DCB183B, DCB184, DCB184B, DCB185, DCB187, DCB189,
DCB546, DCB547, DCB548. Refer to Technical Data for
moreinformation.
Package Contents
The package contains:
1 Angle grinder
1 Guard
1 Side handle
1 Backing flange
1 Locking flange
1 Hex wrench
1 Li-Ion battery pack (C1, D1, L1, M1, P1, S1, T1, X1, Y1 models)
2 Li-Ion battery packs (C2, D2, L2, M2, P2, S2, T2, X2, Y2 models)
3 Li-Ion battery packs (C3, D3, L3, M3, P3, S3, T3, X3, Y3 models)
1 Instruction manual
• Check for damage to the tool, parts or accessories which may
have occurred duringtransport.
• Take the time to thoroughly read and understand this manual
prior tooperation.
Markings on Tool
The following pictograms are shown on the tool:
Read instruction manual beforeuse.
Wear earprotection.
Wear eyeprotection.
Date Code Position (Fig. B)
The date code19, which also includes the year of manufacture,
is printed into thehousing.
Example:
2019 XX XX
Year of Manufacture
Description (Fig. A, B)
WARNING: Never modify the power tool or any part of it.
Damage or personal injury couldresult.
1 Trigger switch
2 Lock-off button
3 Spindle lock button
4 Spindle
5 Side handle
6 Backing flange

12
ENGLISH
7 Threaded clamp nut / Locking flange
8 Guard
9 Guard release lever
10 Battery pack
11 Battery release button
Intended Use
The DCG412 cordless angle grinder has been designed for
professional cutting, light-duty material removal and wire-
brushapplications.
DO NOT use grinding wheels other than centre depressed
wheels and flapdiscs.
DO NOT use under wet conditions or in the presence of
flammable liquids orgases.
This heavy-duty angle grinder is a professional powertools.
DO NOT let children come into contact with the tool.
Supervision is required when inexperienced operators use
thistool.
• Young children and the infirm. This appliance is not
intended for use by young children or infirm persons
withoutsupervision.
• This product is not intended for use by persons (including
children) suffering from diminished physical, sensory or
mental abilities; lack of experience, knowledge or skills
unless they are supervised by a person responsible for their
safety. Children should never be left alone with thisproduct.
ASSEMBLY AND ADJUSTMENTS
WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect tool from power
source before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can causeinjury.
WARNING: Use only DeWALT battery packs andchargers.
Inserting and Removing the Battery Pack
from the Tool (Fig. B)
NOTE: Make sure your battery pack10 is fullycharged.
To Install the Battery Pack into the Tool Handle
1. Align the battery pack10 with the rails inside the tool’s
handle (Fig.B).
2. Slide it into the handle until the battery pack is firmly seated
in the tool and ensure that you hear the lock snap intoplace.
To Remove the Battery Pack from the Tool
1. Press the release button11 and firmly pull the battery pack
out of the toolhandle.
2. Insert battery pack into the charger as described in the
charger section of thismanual.
Fuel Gauge Battery Packs (Fig. B)
Some DeWALT battery packs include a fuel gauge which consists
of three green LED lights that indicate the level of charge
remaining in the batterypack.
To actuate the fuel gauge, press and hold the fuel gauge
button16. A combination of the three green LED lights will
illuminate designating the level of charge left. When the level
of charge in the battery is below the usable limit, the fuel gauge
will not illuminate and the battery will need to berecharged.
NOTE: The fuel gauge is only an indication of the charge left on
the battery pack. It does not indicate tool functionality and is
subject to variation based on product components, temperature
and end-userapplication.
Attaching Side Handle (Fig.C)
WARNING: Before using the tool, check that the handle is
tightenedsecurely.
WARNING: The side handle should always be used to
maintain control of the tool at alltimes.
Screw the side handle5 tightly into one of the holes on either
side of the gearcase.
To improve user comfort, the gear case will rotate 90° for
cuttingoperations.
Rotating the Gear Case (Fig.A)
1. Remove the four corner screws attaching the gear case to
motorhousing.
2. Without separating the gear case from motor housing,
rotate the gear case head to desiredposition.
NOTE: If the gear case and motor housing become separated
by more than 3.17 mm, the tool must be serviced and
re-assembled by an authorised DeWALT service centre.
Failure to have the tool serviced may cause brush, motor and
bearingfailure.
3. Reinstall screws to attach the gear case to the motor
housing. Tighten screws to 20 in.-lbs. torque. Overtightening
could cause screws tostrip.
Guards
WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can causeinjury.
CAUTION: Guards must be used with all grinding
wheels, cutting wheels, sanding flap discs, wire
brushes, and wire wheels. The tool may be used
without a guard only when sanding with conventional
sanding discs. Some applications may require purchasing
the correct guard from your local dealer or authorized
servicecentre.
NOTE: Edge grinding and cutting can be performed with Type
27 wheels designed and specified for this purpose; 6.35 mm
thick wheels are designed for surface grinding while thinner
Type 27 wheels need to be examined for the manufacturer's
label to see if they can be used for surface grinding or only

13
ENGLISH
edge grinding/cutting. A Type 1 guard must be used for any
wheel where surface grinding is forbidden. Cutting can also be
performed by using a Type41 wheel and a Type 1guard.
NOTE: See the Grinding and Cutting Accessory Chart to select
the proper guard / accessorycombination.
Mounting and Adjusting the One-TouchTM Guard
(Fig. D)
Mounting Guard (Fig. D)
1. Press the guard release lever9.
2. While holding the guard release lever open, align the
lugs12 on the guard with the slots13 on the gearcase.
3. Keeping the guard release lever open, push the guard down
until the guard lugs engage and rotate them in the groove
on the gear case hub. Release the guard releaselever.
4. With the spindle facing the operator, rotate the guard
clockwise into the desired working position. Press and
hold the guard release lever9 to rotate the guard in the
counterclockwisedirection.
NOTE: The guard body should be positioned between
the spindle and the operator to provide maximum
operatorprotection.
The guard release lever should snap into one of the
alignment holes14 on the guard collar. This ensures that
the guard issecure.
5. To remove the guard, follow steps 1–3 of these instructions
inreverse.
Adjusting the Guard
For guard adjustment, the guard release lever9 engages
one of the alignment holes14 on the guard collar using a
ratchetingfeature.
The engaging face is slanted and will ride over to the
next alignment hole when guard is rotated in a clockwise
direction (spindle facing user) but self-locks in the anti-
clockwisedirection.
Mounting Closed (Type 1) Guard (Fig.G)
1. Open the guard latch9, and align the lugs12 on the
guard with the slots on the gear case13. This will align the
lugs with slots on the gear case cover. Position the guard
facingbackward.
2. Push the guard down until the guard lug engages and
rotates freely in the groove on the gear casehub.
3. Rotate guard8 into desired working position. The guard
body should be positioned between the spindle and the
operator to provide maximum operatorprotection.
4. Close the guard latch to secure the guard on the gear case
cover. You should be unable to rotate the guard by hand
when the latch is in closed position. Do not operate grinder
with a loose guard or clamp lever in openposition.
5. To remove the guard, open the guard latch, rotate the guard
so that the arrows are aligned and pull up on theguard.
NOTE: The guard is pre-adjusted to the diameter of the gear
case hub at the factory. If, after a period of time, the guard
becomes loose, tighten the adjusting screw18 with the clamp
lever in the closed position with guard installed on thetool.
NOTICE: To reduce the risk of damage to the tool, do
not tighten adjusting screw18 with clamp lever in open
position. Undetectable damage to guard or mounting hub
mayresult.
Flanges and Wheels
WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can causeinjury.
Mounting Non-Hubbed Wheels (Fig.A,E)
NOTE: The Type 27 guard supplied with grinder MUST beused.
WARNING: Failure to properly seat the flanges and/or
wheel could result in serious injury (or damage to the tool
or wheel).
CAUTION: Included flanges must be used with depressed
centre Type 27 and Type 42 grinding wheels and
Type41 cutting wheels. See the Grinding and Cutting
Accessory Chart for moreinformation.
WARNING: A closed, two-sided cutting wheel guard is
required when using cuttingwheels.
WARNING: Use of a damaged flange or guard or failure
to use proper flange and guard can result in injury due
to wheel breakage and wheel contact. See the Grinding
and Cutting Accessory Chart for moreinformation.
1. Place the tool on a table, guardup.
2. Install the backing flange6 on spindle4 with the raised
centre (pilot) facing the wheel. Press the backing flange
intoplace.
3. Place wheel15 against the backing flange, centreing the
wheel on the raised centre (pilot) of the backingflange.
4. While depressing the spindle lock button3 and with the
hex depressions facing away from the wheel, thread the
locking flange7 on spindle so that the lugs engage the two
slots in thespindle.
5. While depressing the spindle lock button3, tighten the
locking flange7 by hand or using the wrench supplied.
(Only use a locking flange if it is in perfect condition.) Refer
to Accessory Chart to see flangedetails.
6. To remove the wheel, reverse the aboveprocedure.
Mounting Sanding Backing Pads (Fig.A,F)
NOTE: Use of a guard with sanding discs that use backing pads,
often called fiber resin discs, is not required. Since a guard is
not required for these accessories, the guard may or may not fit
correctly ifused.
WARNING: Failure to properly seat the flange/ clamp nut/
wheel could result in serious injury (or damage to the tool
or wheel).
WARNING: Proper guard must be reinstalled for grinding
wheel, cutting wheel, sanding flap disc, wire brush or
wire wheel applications after sanding applications
arecomplete.

14
ENGLISH
1. Place or appropriately thread backing pad20 on
thespindle.
2. Place the sanding disc21 on the backing pad20.
3. While depressing spindle lock3, thread the clamp nut22
on the spindle, piloting the raised hub on the clamp nut into
the centre of sanding disc and backingpad.
4. Tighten the clamp nut by hand. Then depress the spindle
lock button while turning the sanding disc until the sanding
disc and clamp nut aresnug.
5. To remove the wheel, grasp and turn the backing pad and
sanding pad while depressing the spindle lockbutton.
Mounting and Removing Hubbed Wheels (Fig. A)
NOTE: The Type 27 guard supplied with grinder MUST beused.
Hubbed wheels install directly on the threaded spindle. Thread
of accessory must match thread ofspindle.
1. Remove backing flange by pulling away fromtool.
2. Thread the wheel on the spindle4 byhand.
3. Depress the spindle lock button3 and use a wrench to
tighten the hub of thewheel.
4. To remove the wheel, reverse the aboveprocedure.
NOTICE: Failure to properly seat the wheel before turning
the tool on may result in damage to the tool or thewheel.
Mounting Wire Cup Brushes and WireWheels
(Fig.A)
WARNING: Failure to properly seat the flange/ clamp nut/
wheel could result in serious injury (or damage to the tool
or wheel).
CAUTION: To reduce the risk of personal injury,
wear work gloves when handling wire brushes and
wheels. They can becomesharp.
CAUTION: To reduce the risk of damage to the tool,
wheel or brush must not touch guard when mounted
or while in use. Undetectable damage could occur to
the accessory, causing wires to fragment from accessory
wheel orcup.
Wire cup brushes or wire wheels install directly on the threaded
spindle without the use of flanges. Use only wire brushes or
wheels provided with a threaded hub. These accessories are
available at extra cost from your local dealer or authorised
servicecentre.
1. Place the tool on a table, guardup.
2. Thread the wheel on the spindle byhand.
3. Depress spindle lock button3 and use a wrench on the
hub of the wire wheel or brush to tighten thewheel.
4. To remove the wheel, reverse the aboveprocedure.
NOTICE: To reduce the risk of damage to the tool, properly
seat the wheel hub before turning the toolon.
Mounting Cutting Wheels (Fig.A,E)
Cutting wheels include diamond wheels and abrasive discs.
Abrasive cutting wheels for metal and concrete use are available.
Diamond blades for concrete cutting can also be used. These
accessories are available at extra cost from your local dealer or
authorised servicecentre.
WARNING: A closed, two-sided cutting wheel guard is
required when using cutting wheels. These accessories are
available at extra cost from your local dealer or authorised
service centre. Failure to use proper flange and guard
can result in injury resulting from wheel breakage and
wheel contact. Please refer to the Grinding and Cutting
Accessory Chart at the end of this section to see other
accessories that can be used with thesegrinders.
CAUTION: Matching diameter backing flange and clamp
nut (included with tool) must be used for cuttingwheels.
1. Place the unthreaded backing flange6 on spindle with the
raised centre facing up. The raised centre on the backing
flange will be against the wheel when the wheel isinstalled.
2. Place the wheel on the backing flange, centreing the wheel
on the raisedcentre.
3. Install the threaded clamp nut7with the raised centre away
from thewheel.
4. Depress the spindle lock button3 and tighten clamp nut
with awrench.
5. To remove the wheel, depress the spindle lock button and
loosen the threaded clamp nut with awrench.
Prior to Operation
• Install the guard and appropriate disc or wheel. Do not use
excessively worn discs orwheels.
• Be sure the inner and outer flange are mounted correctly.
Follow the instructions given in the Grinding and Cutting
AccessoryChart.
• Make sure the disc or wheel rotates in the direction of the
arrows on the accessory and thetool.
• Do not use a damaged accessory. Before each use inspect
the accessory such as abrasive wheels for chips and cracks,
backing pad 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 accessories will normally break apart
during this testtime.
OPERATION
Instructions for Use
WARNING: Always observe the safety instructions and
applicableregulations.
WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can causeinjury.
WARNING:
• Ensure all materials to be ground or cut are secured
inplace.
• Secure and support the workpiece. Use clamps or a
vice to hold and support the workpiece to a stable

15
ENGLISH
platform. It is important to clamp and support the
workpiece securely to prevent movement of the
workpiece and loss of control. Movement of the
workpiece or loss of control may create a hazard and
cause personalinjury.
• 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.
• Apply only a gentle pressure to the tool. Do not exert
side pressure on thedisc.
• Always wear regular working gloves while operating
thistool.
• The gear case becomes very hot duringuse.
• Always install the guard and appropriate disc or
wheel. Do not use excessively worn disc orwheel.
• Be sure the inner and outer flange are
mountedcorrectly.
• Make sure the disc or wheel rotates in the direction of
the arrows on the accessory and thetool.
• Avoid overloading. Should the tool become hot, let it
run a few minutes under no load condition to cool the
accessory. Do not touch accessories before they have
cooled. The discs become very hot duringuse.
• Never work with the grinding cup without a suitable
protection guard inplace.
• Do not use the power tool with a cut-offstand.
• Never use blotters together with bonded
abrasiveproducts.
• Be aware, the wheel continues to rotate after the tools
is switchedoff.
Proper Hand Position (Fig. A, H)
WARNING: To reduce the risk of serious personal injury,
ALWAYS use proper hand position asshown.
WARNING: To reduce the risk of serious personal
injury, ALWAYS hold securely in anticipation of a
suddenreaction.
Proper hand position requires one hand on the side handle5,
with the other hand on the body of the tool, as shown in
FigureH.
Switch
WARNING: Before using the tool, check that the handle is
tightenedsecurely.
Lock-off Button and Trigger Switch (Fig.I)
Your cut-off tool is equipped with a lock-off button2.
To lock the trigger switch1, press the lock-off button as shown
in FigureI. When the lock-off button is depressed to the lock
icon, the unit islocked.
Always lock the trigger switch when carrying or storing the tool
to eliminate unintentionalstarting.
To unlock the trigger switch, press the lock-off button2. When
the lock-off button is depressed to the unlock icon, the unit is
unlocked. The lock-off button is colored red to indicate when
the switch is in its unlockedposition.
Pull the trigger switch1 to turn the motor ON. Releasing the
trigger switch turns the motorOFF.
NOTE: This tool has no provision to lock the switch in the ON
position, and should never be locked ON by any othermeans.
WARNING: Hold the side handle and body of the tool
firmly to maintain control of the tool at start up and
during use and until the wheel or accessory stops rotating.
Make sure the wheel has come to a complete stop before
laying the tooldown.
WARNING: Allow the tool to reach full speed before
touching tool to the work surface. Lift the tool from the
work surface before turning the tooloff.
Spindle Lock (Fig.A)
The spindle lock3 is provided to prevent the spindle from
rotating when installing or removing wheels. Operate the
spindle lock only when the tool is turned off, unplugged from
the power supply, and has come to a completestop.
NOTICE: To reduce the risk of damage to the tool, do
not engage the spindle lock while the tool is operating.
Damage to the tool will result and attached accessory
may spin off possibly resulting ininjury.
To engage the lock, depress the spindle lock button3
and rotate the spindle until you are unable to rotate the
spindlefurther.
Using Depressed Centre Grinding Wheels
Surface Grinding with Grinding Wheels
1. Allow the tool to reach full speed before touching the tool
to the worksurface.
2. Apply minimum pressure to the work surface, allowing the
tool to operate at high speed. Grinding rate is greatest when
the tool operates at highspeed.
3. Maintain a 20° to 30° angle between the tool and
worksurface.
4. Continuously move the tool in a forward and back motion to
avoid creating gouges in the worksurface.
5. Remove the tool from work surface before turning tool off.
Allow the tool to stop rotating before laying itdown.
Edge Grinding with Grinding Wheels
WARNING: Wheels used for cutting and edge grinding
may break or kickback if they bend or twist while the
tool is being used to do cut-off work or deep grinding.
To reduce the risk of serious injury, limit the use of these
wheels with a standard Type 27 guard to shallow cutting
and notching (less than 13 mm in depth). The open side of
the guard must be positioned away from the operator. For
deeper cutting with a Type 1 cut-off wheel, use a closed
Type 1 guard. Please refer to the Grinding and Cutting
Accessory Chart at the end of this section to see other
accessories that can be used with thesegrinders.

16
ENGLISH
1. Allow the tool to reach full speed before touching the tool
to the worksurface.
2. Apply minimum pressure to the work surface, allowing the
tool to operate at high speed. Grinding rate is greatest when
the tool operates at highspeed.
3. Position yourself so that the open-underside of the wheel is
facing away fromyou.
4. Once a cut is begun and a notch is established in the
workpiece, do not change the angle of the cut. Changing
the angle will cause the wheel to bend and may cause
wheel breakage. Edge grinding wheels are not designed to
withstand side pressures caused bybending.
5. Remove the tool from the work surface before turning the
tool off. Allow the tool to stop rotating before laying itdown.
WARNING: Do not use edge grinding/cutting wheels for
surface grinding applications because these wheels are
not designed for side pressures encountered with surface
grinding. Wheel breakage and serious personal injury
mayresult.
Using Wire Brushes and WireWheels
Wire wheels and brushes can be used for removing rust, scale
and paint, and for smoothing irregularsurfaces.
NOTE: Please refer to Precautions To Take When Wire
BrushingPaint.
1. Allow the tool to reach full speed before touching the tool
to the worksurface.
2. Apply minimum pressure to work surface, allowing the tool
to operate at high speed. Material removal rate is greatest
when the tool operates at highspeed.
3. Maintain a 5° to 10° angle between the tool and work
surface for wire cupbrushes.
4. Maintain contact between the edge of the wheel and the
work surface with wirewheels.
5. Continuously move the tool in a forward and back motion to
avoid creating gouges in the work surface. Allowing the tool
to rest on the work surface without moving, or moving the
tool in a circular motion causes burning and swirling marks
on the worksurface.
6. Remove the tool from the work surface before turning
the tool off. Allow the tool to stop rotating before setting
itdown.
CAUTION: Use extra care when working over an edge, as
a sudden sharp movement of grinder may beexperienced.
Using Cutting (Type 1) Wheels
WARNING: Do not use edge grinding/cutting wheels for
surface grinding applications because these wheels are
not designed for side pressures encountered with surface
grinding. Wheel breakage and injury mayresult.
1. Allow tool to reach full speed before touching tool to
worksurface.
2. Apply minimum pressure to work surface, allowing tool to
operate at high speed. Cutting rate is greatest when the tool
operates at highspeed.
3. Once a cut is begun and a notch is established in the
workpiece, do not change the angle of the cut. Changing
the angle will cause the wheel to bend and may cause
wheelbreakage.
4. Remove the tool from work surface before turning tool off.
Allow the tool to stop rotating before setting itdown.
Precautions to Take When Wire Brushing Paint
1. Wire brushing of lead based paint is NOT RECOMMENDED
due to the difficulty of controlling the contaminated dust.
The greatest danger of lead poisoning is to children and
pregnantwomen.
2. Since it is difficult to identify whether or not a paint contains
lead without a chemical analysis, we recommend the
following precautions when wire brushing any paint:
Personal Safety
1. No children or pregnant women should enter the work area
where the paint removal is being done until all clean up
iscompleted.
2. A dust mask or respirator should be worn by all persons
entering the work area. The filter should be replaced daily or
whenever the wearer has difficultybreathing.
NOTE: Only those dust masks suitable for working with lead
paint dust and fumes should be used. Ordinary painting
masks do not offer this protection. See your local hardware
dealer for the proper respiratoryprotection.
3. NO EATING, DRINKING or SMOKING should be done in the
work area to prevent ingesting contaminated paint particles.
Workers should wash and clean up BEFORE eating, drinking
or smoking. Articles of food, drink, or smoking should not be
left in the work area where dust would settle onthem.
Environmental Safety
1. Paint should be removed in such a manner as to minimize
the amount of dustgenerated.
2. Areas where paint removal is occurring should be sealed
with plastic sheeting of 4 milsthickness.
3. Wire brushing should be done in a manner to reduce
tracking of paint dust outside the workarea.
Cleaning and Disposal
1. All surfaces in the work area should be vacuumed
and thoroughly cleaned daily for the duration of the
wire brushing project. Vacuum filter bags should be
changedfrequently.
2. Plastic drop cloths should be gathered up and disposed
of along with any dust chips or other removal debris. They
should be placed in sealed refuse receptacles and disposed
of through regular trash pick-upprocedures.
During clean up, children and pregnant women should be
kept away from the immediate workarea.
3. All toys, washable furniture and utensils used by children
should be washed thoroughly before being usedagain.

17
ENGLISH
Metal Applications
When using the tool in metal applications, make sure that a
residual current device (RCD) has been inserted to avoid residual
risks caused by metalswarf.
If the power supply is shut off by the RCD, take the tool to an
authorised DeWALT repairagent.
WARNING: In extreme working conditions, conductive
dust can accumulate inside the machine housing when
working with metal. This can result in the protective
insulation in the machine becoming degraded with a
potential risk of an electricalshock.
To avoid build-up of metal swarf inside the machine, we
recommend to clear the ventilation slots on a daily basis. Refer
toMaintenance.
Cutting Metal
For cutting with bonded abrasives, always use the guard
type1.
When cutting, work with moderate feed, adapted to the
material being cut. Do not exert pressure onto the cutting disc,
tilt or oscillate themachine.
Do not reduce the speed of running down cutting discs by
applying sidewardpressure.
The machine must always work in an upgrinding motion.
Otherwise, the danger exists of it being pushed uncontrolled
out of thecut.
When cutting profiles and square bar, it is best to start at the
smallest crosssection.
Rough Grinding
Never use a cutting disc for roughing. Always use the
guard type27.
The best roughing results are achieved when setting the
machine at an angle of 30° to 40°. Move the machine back and
forth with moderate pressure. In this manner, the workpiece
will not become too hot, does not discolour and no grooves
areformed.
Cutting Stone
The machine shall be used only for drycutting.
For cutting stone, it is best to use a diamond cutting disc.
Operate the machine only with additional dust protectionmask.
Working Advice
Exercise caution when cutting slots in structuralwalls.
Slots in structural walls are subject to the country-specific
regulations. These regulations are to be observed under all
circumstances.Before beginning work, consult the responsible
structural engineer, architect or the constructionsupervisor.
MAINTENANCE
Your DeWALT power tool has been designed to operate
over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper tool
care and regularcleaning.
WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect battery pack
before making any adjustments or removing/
installing attachments or accessories. An accidental
start-up can cause injury.
The charger and battery pack are notserviceable.
Pop-off Brushes
The motor will be automatically shut off indicating that the
carbon brushes are nearly worn out and that the tool needs
servicing. The carbon brushes are not user-serviceable. Take the
tool to an authorised DeWALT repairagent.
Lubrication
Your power tool requires no additionallubrication.
Cleaning
WARNING: Blow dirt and dust out of the main housing
with dry air as often as dirt is seen collecting in and around
the air vents. Wear approved eye protection and approved
dust mask when performing thisprocedure.
WARNING: Never use solvents or other harsh chemicals
for cleaning the non-metallic parts of the tool. These
chemicals may weaken the materials used in these parts.
Use a cloth dampened only with water and mild soap.
Never let any liquid get inside the tool; never immerse any
part of the tool into aliquid.
Optional Accessories
WARNING: Since accessories, other than those offered
by DeWALT, have not been tested with this product, use
of such accessories with this tool could be hazardous.
To reduce the risk of injury, only DeWALT recommended
accessories should be used with thisproduct.
Consult your dealer for further information on the
appropriateaccessories.
Accessory Chart
Max.
[mm]
[mm]
Min.
Rotation
[min.-1]
Periphical
speed
[m/s]
Threaded
hole length
[mm]
D b d
d
D
b
125 6 22,23 11000 80 -
d
D
b
75 30 M14 11000 45 18.0
D125 12 M14 11000 80 18.0

18
ENGLISH
Protecting the Environment
Separate collection. Products and batteries marked
with this symbol must not be disposed of with normal
householdwaste.
Products and batteries contain materials that can
be recovered or recycled reducing the demand for raw
materials. Please recycle electrical products and batteries
according to local provisions. Further information is available at
www.2helpU.com.
Rechargeable Battery Pack
This long life battery pack must be recharged when it fails
to produce sufficient power on jobs which were easily done
before. At the end of its technical life, discard it with due care for
our environment:
• Run the battery pack down completely, then remove it from
thetool.
• Li-Ion cells are recyclable. Take them to your dealer or a
local recycling station. The collected battery packs will be
recycled or disposed ofproperly.