Epson DW870 User Manual

383823-01/DW870 5/3/02 1:33 PM Page 1

DEWALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286 Printed in China (MAY00-1) Form No. 383823-01

DW870 Copyright © 2000

The following are trademarks for one or more DeWALT power tools: the yellow and black color scheme; the “D” shaped air intake grill; the array of
pyramids on the handgrip; the kit box configuration; and the array of lozenge-shaped humps on the surface of the tool.

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INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES

DW870

14" (355 mm) Heavy Duty Chop Saw
Scie fendeuse de 355 mm (14 po) et de service intensif
Cortadora de metales de 355 mm (14")

INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA
DE GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES
DE USAR EL PRODUCTO.

Questions? See us on the World Wide Web at www.dewalt.com

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English

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS
OR ANY D

EWALT TOOL, CALL US TOLL FREE AT:

1-800-4-DEWALT (1-800-433-9258)

WARNING: FOR YOUR OWN SAFETY READ INSTRUCTION

MANUAL BEFORE OPERATING CHOP SAW.

Important Safety Instructions

WARNING! Read and understand all instructions. Failure to
follow all instructions listed below may result in electric shock, fire
and/or serious personal injury.

SAVE THESE INSTRUCTIONS

• KEEP GUARDS IN PLACE and in working order.

• REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of

checking to see that keys and adjusting wrenches are removed
from tool before turning it on.

• KEEP WORK AREA CLEAN. Cluttered areas and benches invite

injuries.

• DON’T USE IN DANGEROUS ENVIRONMENT. Don’t use power

tools in damp or wet locations, or expose them to rain. Keep work
area well lighted.

• KEEP CHILDREN AWAY. All visitors should be kept at a safe

distance from work area.

• MAKE WORKSHOP KID PROOF with padlocks, master switches,

or by removing starter keys.

• DON’T FORCE TOOL. It will do the job better and safer at the

rate for which it was designed.

• USE RIGHT TOOL. Don’t force tool or attachment to do a job for

which it was not designed.

• USE PROPER EXTENSION CORD. Make sure your extension

cord is in good condition. When using and extension cord, be sure
to use one heavy enough to carry the current your product will
draw. An undersized cord will cause a drop in line voltage resulting
in loss of power and overheating. The following table shows the
correct size to use depending on cord length and nameplate
ampere rating. If in doubt, use the next heavier gage. The smaller
the gage number, the heavier the cord.

1

STOPPER PIN

TRIGGER

SWITCH

LOWER
GUARD

RELEASE

LEVER

BLADE LOCK

LEVER

FENCE

VISE

UPPER GUARD

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English

Minimum Gage for Cord Sets

Volts Total Length of Cord in Feet

120V 0-25 26-50 51-100 101-150
240V 0-50 51-100 101-200 201-300

Ampere Rating

More Not more American Wire Gage
Than Than
0- 6 18 16 16 14
6 - 10 18 16 14 12
10 - 12 16 16 14 12
12 - 16 14 12 Not Recommended

• WEAR PROPER APPAREL.Do not wear loose clothing, neckties,
rings, bracelets, or other jewelry which may get caught in moving
parts. Nonslip footwear is recommended. Wear protective hair
covering to contain long hair.

Air vents often cover moving parts and

should also be avoided.

• ALWAYS USE SAFETY GLASSES.Also use face or dust mask if
cutting operation is dusty. Everyday eyeglasses only have impact
resistant lenses, they are not safety glasses.

• SECURE WORK. Use clamps or a vise to hold work when
practical. It’s safer than using your hand and it frees both hands to
operate tool.

• DON’T OVERREACH. Keep proper footing and balance at all
times.

• MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for
best and safest performance. Follow instructions for lubricating and
changing accessories.

• DISCONNECT TOOLS before servicing; when changing acces-
sories, such as blades, bits, cutters, and the like.

• REDUCE THE RISK OF UNINTENTIONAL STARTING. Make
sure switch is in off position before plugging in.

• USE RECOMMENDED ACCESSORIES. Consult the instruction
manual for recommended accessories. The use of improper
accessories may cause risk of injury to persons.

• NEVER STAND ON T OOL.Serious injury could occur if the tool is

tipped or if the cutting tool is unintentionally contacted.

• CHECK DAMAGED PARTS. Before further use of the tool, a
guard or other part that is damaged should be carefully checked
to determine that it will operate properly and perform its intended
function — check for alignment of moving parts, binding of moving
parts, breakage of parts, mounting, and any other conditions that
may affect its operation. A guard or other part that is damaged
should be properly repaired or replaced.

• DIRECTION OF FEED. Feed work into a blade or cutter against
the direction of rotation of the blade or cutter only.

• NEVER LEAVE TOOL RUNNING UNATTENDED. TURN
POWER OFF. Don’t leave tool until it comes to a complete stop.

• REPLACEMENT PARTS. When servicing use only identical
replacement parts.

• TO REDUCE THE RISK OF ELECTRIC SHOCK, this equipment
may have a polarized plug (one blade is wider than the other.)
This plug will fit in a polarized outlet only one way. If the plug does
not fit, contact a qualified electrician to install the proper outlet.
DO NOT CHANGE THE PLUG IN ANY WAY.

• The tool may be equipped with a 3-prong grounding type plug. This
plug is to be used in a grounded outlet only. If the plug does not fit,
contact a qualified electrician to install the proper outlet. DO NOT
CHANGE THE PLUG IN ANY WAY.

Additional Safety Rules for Chop Saw

• Always wear safety goggles or other eye protection when using this tool.

• Before using, inspect each cutting wheel for cracks or flaws. If a crack
or flaw is evident—discard the wheel! The wheel should also be
inspected whenever you think the tool may have been dropped.

• When starting the tool (with a new or replacement wheel installed)
place the tool in a well protected area. If the wheel has an undetected
crack or flaw, it should burst in less than one minute. Never start the
tool with a person in line with the wheel. This includes the operator.

• In operation, avoid bouncing the wheel or giving it rough treatment.
If this occurs, stop the tool and inspect the wheel.

2

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English

• Clean your chop saw periodically following the procedure in this manual.

• Do not remove wheel guard.

• ALW AYS USE THE VISE OR SPECIAL FIXTURE TO CLAMP
WORK SECURELY. Other aids such as the, spring, bar, or C-clamps
may be appropriate for certain sizes and shapes of workpiece. Use
care in selecting and placing these clamps and make a dry run before
making a cut.

• Use only 14” type 1 wheels rated at 4100 rpm or higher.

• Allow cut off parts to cool before handling.

• Do not attempt to cut wood or plastic with this tool.

• NEVER CUT MAGNESIUM WITH THIS TOOL.

• Use chop saw in a well-ventilated area.

• Turn chop saw off before removing any pieces from the base.

• DO NOT CUT ELECTRICALLY LIVE MATERIAL.

• NEVER USE A CIRCULAR SAW BLADE IN THIS CHOP SAW.
do not use toothed blades.

• DO NOT OPERATE THIS TOOL NEAR FLAMMABLE LIQUIDS,
GASES OR DUST. Sparks or hot chips from cutting or arcing motor
brushes may ignite combustible materials.

• Do not use the side of the abrasive wheel as a deburring grinder.
This will substantially weaken the wheel creating an unsafe
condition. The wheel may come apart .

CAUTION: Wear appropriate hearing protection during use.

Under some conditions and duration of use, noise from this product
may contribute to hearing loss.

WARNING: Some dust created by power sanding, sawing, grinding,
drilling, and other construction activities contains chemicals known to
cause cancer, birth defects or other reproductive harm. Some
examples of these chemicals are:

• lead from lead-based paints,

• crystalline silica from bricks and cement and other masonry
products, and

• arsenic and chromium from chemically-treated lumber (CCA).

Your risk from these exposures varies, depending on how often you do

this type of work. T o reduce your exposure to these chemicals: work in
a well ventilated area, and work with approved safety equipment, such
as those dust masks that are specially designed to filter out
microscopic particles.

• Avoid prolonged contact with dust from power sanding,

sawing, grinding, drilling, and other construction activities.
Wear protective clothing and wash exposed areas with soap
and water.Allowing dust to get into your mouth, eyes, or lay on the

skin may promote absorption of harmful chemicals.

Power Supply

Be sure your power supply agrees with the nameplate marking. 120
volts, “60 Hz” means alternating current (normal 120 volt, 60 Hz
house current).

A voltage decrease of more than 10% will cause a loss of power and
overheating.

Cutting Capacity

The wide vise opening and high pivot point provide cutting capacity
for many large pieces. Use the cutting capacity chart to determine
total maximum size of cuts that can be made with a new wheel.

CAUTION: CERTAIN LARGE, CIRCULAR OR IRREGULARLY
SHAPED OBJECTS MAY REQUIRE ADDITIONAL HOLDING
MEANS IF THEY CANNOT BE HELD SECURELY IN VISE.

CAUTION: DO NOT CUT MAGNESIUM WITH THIS TOOL.

Maximum Cutting Capacity

NOTE: CAPACITY SHOWN ON CHART ASSUMES NO WHEEL WEAR
AND OPTIMUM FENCE POSITION.

Standard Equipment

1 14” Metal Cutting Abrasive Wheel. Use only high strength Type 1

organic bonded wheels rated 4,100 rpm or higher.(Aluminum
Oxide)

1 Wheel Wrench

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English

FIG. 1

FIG. 2

S

T

O

P

P

E

R

P

I

N

TRIGGER

SWITCH

BLADE

LOCK

LEVER

FENCE AT FORWARD

POSITION

FENCE AT REAR

POSITION

6”

5”

4”

3”

2”

1”

0” 1” 2” 3” 4” 5” 6” 7” 8”

9”

4.75”

3.93”

6.25” 7.75”

HEIGHT

WIDTH

CHAIN

To Carry

Fold down unit to position where you can attach chain to pin on tool
arm (Fig. 1).

Unlocking

To unlock tool and raise head, depress motor arm slightly and
remove chain. Motor arm will then pivot upward (see Figure 2).

Material Clamping and Supporting

• Angles are best clamped and cut with both legs resting against

base

• A spacer block slightly narrower than the work space

can be used to increase wheel utilization.

• Long workpieces must be supported by a block so it will be

level with top of base. The cut off end should be free to fall
downward to avoid wheel binding.

Vise Operation

Vise has a quick travel feature. To release the vise when it is clamped
tightly, turn the crank counterclockwise one or two times to remove
clamping pressure. Lift vise lever up. Pull crank assembly out as far
as desired. Vise may be shoved into work without cranking. Lower
vise lever then tighten vise on work by using crank (see Figure 5).

FIG. 3

WRENCH

FENCE

FENCE BOLTS

VISE

FIG. 4

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15

30

15

0

30

5

1

45

30

5

English

To Adjust Vise Stop

CUTTING ANGLE

Use the wrench to
loosen the two hex
bolts (Fig. 3). (Do
not remove the
bolts). The fence
can be rotated in
either direction.
Securely tighten
both the bolts
before use.

Switch

To start the tool,
depress the trigger switch shown in Figure 2. To turn the tool off,
release the trigger switch. Keep hands and material from wheel until it
has coasted to a stop.

Removal and Installation of Wheels

1. Be sure tool is disconnected from power supply.

2. Push in wheel lock lever (Figure 6) and rotate wheel by hand until
wheel lock lever engages slot in inside flange to lock wheel.
Loosen the bolt counterclockwise in the center of the abrasive
wheel with the 8 mm hex wrench found in the holder in the base.
Bolt has right hand thread.

3. Remove the bolt, washer, outside flange, adapter and old wheel
(Fig. 10).

4. Install the new abrasive wheel by reversing the above steps.
Make sure the adapter is on the shaft and centered on the wheel.

5. Do not over tighten bolt.

DO NOT MAKE ANY ADJUSTMENT WHILE THE WHEEL IS IN MOTION.
DO NOT MAKE ANY ADJUSTMENT WHILE CHOP SAW IS PLUGGED
INTO POWER SUPPLY.

WARNING: CHECK THE WORK SURFACE THAT THE CHOP
SAW RESTS ON WHEN REPLACING WITH A NEW ABRASIVE
WHEEL. IT IS POSSIBLE THAT THE WHEEL MAY CONTACT ANY
ITEMS OR STRUCTURE THAT EXTENDS ABOVE WORK SURFACE
(UNDER THE BASE) WHEN THE ARM IS FULL Y LOWERED.

Procedure For Permanent Mounting

1. Drill four holes, 5/16" diameter minimum, through the work
surface (Fig. 7).

2. Remove screws from feet.

3. Insert 1/4-20 screws through underside of work surface,
through feet, into holes in tool base. The proper screw length is
equal to the thickness of the work surface plus 1 inch
(25 mm).

CRADLE MOUNTING

1. Cut two boards approximately 20" long x 2" high x 4" wide.

2. Place chop saw at desired work location.

3. Place boards tightly along side, and nail to work surface,
(Figure 8).

FIG. 5

FIG. 6

GEAR

SHAFT

FLANGE,

INSIDE

ABRASIVE WHEEL

ADAPTER

FLANGE, OUTSIDE

WASHER

HEX HEAD BOLT

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English

Motor Brush Inspection and
Replacement

Be sure tool is unplugged before inspecting brushes. Brushes should
be regularly inspected for wear. To inspect brushes, unscrew the
two end cap screws and remove end cap. T o remove each brush, first
unplug the shunt wire terminal connection. Then carefully back the
brush spring out of the brush box and remove brush. Brushes should
slide freely in brush box. If brushes are worn down to .3” they should
be replaced (see Figure 9). To reinstall each brush carefully back
the spring out of the brush box, insert the brush and return the spring
making sure it is pressing on the brush and not touching the brush
box. Then replace the end cap and two screws.

Operation Tips for More Accurate Cuts

• Allow the wheel to do the cutting. Excessive force will cause the

wheel to glaze reducing cutting efficiency and/or to deflect causing
inaccurate cuts.

• Adjust fence angle. (Figure 3)

• Make sure material is laying flat across base.

• Properly clamp material to avoid movement and vibration.

Cleaning

Blowing dust and grit out of the main housing by means of an air hose
is recommended and may be done as often as dirt is seen collecting
in and around the air vents.

Accessories

Recommended accessories for use with your tool are available at
extra cost from your local dealer or authorized service center. If you
need assistance in locating any accessory for your tool, contact:

D

EWALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD

21286

CAUTION: The use of any other accessory not recommended

for use with this tool could be hazardous.

Important

To assure product SAFETY and RELIABILITY, repairs, maintenance
and adjustment should be performed by authorized service centers
or other qualified service organizations, always using identical

FIG. 7

FIG. 8

16-3/8"

(416 mm)

8-1/2"

(216 mm)

20"

2"-3"

NAIL

4"

FIG. 9

0.3"

7.62 mm

BRUSH

WEAR LINE

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PIN
R

PE

P
O

ST