DeWalt DW887N User manual

DW887N
www. .eu

2
Copyright DEWALT
English (original instructions) 2
Français (traduction de la notice d’instructions originale) 10
ﺍﻝﻉﺭﺏﻱﺓ (ﻡﺕﺭﺝﻡ ﻉﻥ ﺍﻝﺕﻉﻝﻱﻡﺍﺕ ﺍﻝﺃﺹﻝﻱﺓ)19

1
Figure 1
f
Figure 3
c
ed
Figure 2
b
a

ENGLISH
2
DIE GRINDER
DW887N
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
DW887N
Voltage VAC 220/240 120
Power output W 400 400
No load speed min-1 25,000 25,000
Wheel diameter mm 38 38
Spindle M14 M14
Collet size mm 6 6
Weight kg 1.7 1.7
LPA (sound pressure) dB(A) 81 81
KPA (sound pressuree
uncertainty) dB(A) 3 3
LWA (sound power) dB(A) 92 92
KWA (sound power
uncertainty) dB(A) 3.2 3.2
Vibration total values (triax vector sum) determined
according to EN 60745:
Vibration emission value a
h
a
h
= m/s² 2.5 2.5
Uncertainty K = m/s² 2.5 2.5
The vibration emission level given in this information
sheet has been measured in accordance with a
standardised test given in EN 60745 and may be
used to compare one tool with another. It may be
used for a preliminary assessment of exposure.
WARNING: The declared vibration
emission level represents the main
applications of the tool. However if the
tool is used for different applications,
with different accessories or poorly
maintained, the vibration emission may
differ. This may significantly increase the
exposure level over the total working
period.
An estimation of the level of exposure to
vibration should also take into account
the times when the tool is switched off
or when it is running but not actually
doing the job. This may significantly
reduce the exposure level over the total
working period.
Identify additional safety measures to
protect the operator from the effects of
vibration such as: maintain the tool and
the accessories, keep the hands warm,
organisation of work patterns.
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.
WARNING: To reduce the risk of injury,
read the instruction manual.
General Power Tool Safety Warnings
WARNING! Read all safety warnings
and all instructions. Failure to follow
the warnings and instructions may result
in electric shock, fire and/or serious
injury.
SAVE ALL WARNINGS AND INSTRUCTIONS
FOR FUTURE REFERENCE

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3
The term “power tool” in the warnings refers to your
mains-operated (corded) power tool or battery-
operated (cordless) power tool.
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 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,
clothing and gloves 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.
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 the battery pack from
the power tool before making any
adjustments, changing accessories, or
storing power tools. Such preventive safety
measures reduce the risk of starting the
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. Check for
misalignment or binding of moving parts,
breakage of parts and any other condition
that may affect the power tool’s operation.

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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.
5) 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.
ADDITIONAL SPECIFIC SAFETY RULES
Safety Instructions for All Operations
a) This power tool is intended to function
as a grinder, sander, wire brush, polisher
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) 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. (Accessories
for special cutting tools are not allowed!)
c) 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.
d) 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 guarded or
controlled.
e) The arbour size of wheels, flanges, backing
pads or any other accessory must properly
fit the spindle of the power tool. Accessories
with arbour holes that do not match the
mounting hardware of the power tool will run
out of balance, vibrate excessively and may
cause loss of control.
f) 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.
g) 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.
h) 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.
i) 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
shock the operator.
j) 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.
k) 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.
l) 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.

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5
m) 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.
n) Do not operate the power tool near
flammable materials. Sparks could ignite these
materials.
o) Do not use accessories that require liquid
coolants. Using water or other liquid coolants
may result in electrocution or shock.
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) 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.
c) 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.
d) 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

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6
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.
d) 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.
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 Sanding
Operations
a) Do not use excessively oversized sanding
disc paper. Follow manufacturer’s
recommendations, when selecting sanding
paper. Larger sanding paper extending beyond
the sanding pad presents a laceration hazard
and may cause snagging, tearing of the disc
or kickback.
Safety Warnings Specific for
Polishing Operations
a) Do not allow any loose portion of the
polishing bonnet or its attachment strings
to spin freely. Tuck away or trim any loose
attachment strings. Loose and spinning
attachment strings can entangle your fingers or
snag on the workpiece.
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.
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. 1)
The date code (f), which also includes the year of
manufacture, is printed into the housing.
Example:
2011 XX XX
Year of Manufacture
Package Contents
The package contains:
1 DW887N die grinder
2 Spanners
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.

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Description (fig. 1, 2)
WARNING: Never modify the power
tool or any part of it. Damage or
personal injury could result.
a. Lock-off lever
b. Paddle switch
c. Spindle
d. Collet
e. Collet nut
INTENDED USE
Your die grinder has been designed for professional
grinding applications. The tool can be used with the
complete range of commercial grinding tools with a
maximum diameter of 38 mm and approved speed
of 25000/min.
DO NOT use grinding wheel other than specified
under technical data.
DO NOT use under wet conditions or in presence of
flammable liquids or gases.
These die grinders are professional power tools.
DO NOT let children come into contact with the
tool. Supervision is required when inexperienced
operators use this tool.
• 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.
Electrical Safety
The electric motor has been designed for one
voltage only. Always check that the power supply
corresponds to the voltage on the rating plate.
Your DEWALT tool is double insulated in
accordance with EN 60745; therefore no
earth wire is required.
WARNING: 120 V units have to
be operated via a fail-safe isolating
transformer with an earth screen
between the primary and secondary
winding.
If the supply cord is damaged, it must be replaced
by a specially prepared cord available through the
DEWALT service organisation.
Mains Plug Replacement
(Middle East and Africa)
If a new mains plug needs to be fitted:
• Safely dispose of the old plug.
• Connect the brown lead to the live terminal in
the plug.
• Connect the blue lead to the neutral terminal.
WARNING: No connection is to be
made to the earth terminal.
Follow the fitting instructions supplied with good
quality plugs. Recommended fuse: 13 A.
Using an Extension Cable
If an extension cable is required, use an approved
extension cable suitable for the power input of this
tool (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.
ASSEMBLY AND ADJUSTMENTS
WARNING: To reduce the risk of
injury, turn unit off and disconnect
machine from power source before
installing and removing accessories,
before adjusting or changing set-
ups or when making repairs. Be sure
the switch is in the OFF position. An
accidental start-up can cause injury.
Switches
WARNING: Before connecting the tool
to a power source depress and release
the switch once without depressing the
lock-on button to ensure that the switch
is off. Depress and release the switch as
described above after any interruption
in power supply to the tool, such as the
activation of a ground fault interrupter,
throwing of a circuit breaker, accidental
unplugging, or power failure. If the
switch is locked on, the tool will start
unexpectedly when it is reconnected.
WARNING: Grasp tool firmly with both
hands 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.

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8
WARNING: To reduce unexpected tool
movement, do not switch the tool on or
off while under load conditions. Allow
the grinder to run up to full speed before
touching the work surface. Lift the tool
from the surface before turning the tool
off.
PADDLE SWITCH (FIG. 1)
The lock-off lever (a), located on the paddle switch,
is a safety feature that prevents accidental activation
of the grinder.
To turn the tool on, push the lock-off lever (a) toward
the back of the tool, then depress the paddle switch
(b). The tool will run while the switch is depressed.
Turn the tool off by releasing the paddle switch.
WARNING: Do not disable the lock-off
lever. If the lock-off lever is disabled, the
tool may start unexpectedly when it is
laid down.
OPERATION
Instructions for Use
WARNING: Always observe the safety
instructions and applicable regulations.
Install Grinding Wheels (fig. 2)
1. Hold the spindle (c) using the spanner provided.
2. Loosen the collet nut (e) by turning it
counterclockwise.
3. Insert the shank of the accessory into the collet
(d).
4. Securely tighten the collet using the spanner
provided.
To remove the accessory, proceed in reverse order.
WARNING: Grasp tool firmly with both
hands 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.
Put the work in a vise or clamp it securely. Use a
face mask over the nose and mouth if the operation
raises dust. Treat the wheel with respect. Do not
jam the wheel into the work or use unnecessary
pressure. Grind only on the face of the wheel unless
you have a special wheel specifically make to permit
grinding on the side of the wheel.
Proper Hand Position (fig. 3)
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 body,
with the other hand on the neck of the die grinder,
as shown in figure 3.
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
injury, turn unit off and disconnect
machine from power source before
installing and removing accessories,
before adjusting or changing set-ups
or when making repairs. Be sure
the switch is in the OFF position. An
accidental start-up can cause injury.
Motor Brushes
Keep brushes clean and sliding freely in their guides.
Carbon brushes have varying symbols stamped
into them, and if the brush is worn down to the line
closest to the spring, they must be replaced. New
brush assemblies are available at your local service
center.
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.