WORX WU420 User Manual

SAFETY AND OPERATING MANUAL

ORIGINAL INSTRUCTIONS

Mini CirCular Saw wu420

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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 instruc tions for future reference.

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

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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.

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.

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. If damaged, have the
power tool repaired before use. Many accidents are caused by

poorly maintained power tools.

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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) If the replacement of the supply cord is necessary, this has to

be done by the manufacturer or his agent in order to avoid a
safety hazard.

Additional safety rules for your
circular saw

1

Always wear a dust mask, hearing protection and eye protection.

2

Only use saw blades recommended in the specification.

3

Do not use any abrasive wheels.

4

Use only blade diameter(s) in accordance with the markings.

SAFETY WARNINGS FOR ALL SAWS
a) DANGER: Keep hands away from cutting area and the
blade. If both hands are holding the saw, they cannot be cut by the

blade.

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b) Do not reach underneath the workpiece. The guard cannot
protect you from the blade below the workpiece.
c) Adjust the cutting depth to the thickness of the workpiece.
Less than a full tooth of the blade teeth should be visible below the
workpiece.

d) Never hold piece being cut in your hands or across your
leg. Secure the workpiece to a stable platform. It is important

to support the work properly to minimize body exposure, blade
binding, or loss of control.

e) Hold power tool by insulated gripping surfaces when
performing an operation where the cutting tool may contact
hidden wiring or its own cord. Contact with a “live” wire will

also make exposed metal parts of the power tool “live” and shock
the operator.

f) When ripping always use a rip fence or straight edge guide.

This improves the accuracy of cut and reduces the chance of blade
binding.

g) Always use blades with correct size and shape (diamond
versus round) of arbor holes. Blades that do not match the

mounting hardware of the saw will run eccentrically, causing loss
of control.
h) Never use damaged or incorrect blade washers or bolt. The
blade washers and bolt were specially designed for your saw, for
optimum performance and safety of operation.

FURTHER SAFET Y INSTRUCTIONS FOR ALL SAWS
KICKBACK CAUSES AND RELATED WARNINGS:

• Kickback is a sudden reaction to a pinched, bound or misaligned

saw blade, causing an uncontrolled saw to lift up and out of the
workpiece toward the operator.

• When the blade is pinched or bound tightly by the kerf closing

down, the blade stalls and the motor reaction drives the unit
rapidly back toward the operator.

• If the blade becomes twisted or misaligned in the cut, the teeth

at the back edge of the blade can dig into the top surface of the
wood causing the blade to climb out of the kerf and jump back
toward the operator.

• Kickback is the result of saw 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 saw and position your arm to
resist kickback forces. Position your body to either side of the
blade, but not in line with the blade. Position the hand not
holding the saw well away from the travel path of the saw.

Kickback could cause the saw to jump backwards, but kickback

forces can be controlled by the operator, if proper precautions are
taken.

b) When blade is binding, or when interrupting a cut for any
reason, release the trigger and hold the saw motionless in
the material until the blade comes to a complete stop. Never
attempt to remove the saw from the work or pull the saw
backward while the blade is in motion or kickback may occur.

Investigate and take corrective actions to eliminate the cause of
blade binding.

c) When restarting a saw in the workpiece, center the saw
blade in the kerf and check that saw teeth are not engaged
into the material. If saw blade is binding, it may walk up or

kickback from the workpiece as the saw is restarted.

d) Support large panels to minimize the risk of blade pinching
and kickback. Large panels tend to sag under their own weight.

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Supports must be placed under the panel on both sides, near the
line of cut and near the edge of the panel.
e) Do not use dull or damaged blades. Unsharpened or
improperly set blades produce narrow kerf causing excessive
friction, blade binding and kickback.

f) Blade depth and bevel adjusting locking levers must be
tight and secure before making cut. If blade adjustment shifts

while cutting, it may cause binding and kickback.

g) Use extra caution when making a “plunge cut” into
existing walls or other blind areas. The protruding blade may

cut objects that can cause kickback.

SAFETY INSTRUCTIONS FOR PLUNGE- TYPE SAW
a) Check guard for proper closing before each use. Do not
operate the saw if guard does not move freely and enclose
the blade instantly. Never clamp or tie the guard with the
blade exposed. If saw is accidentally dropped, guard may be bent.

Check to make sure that guard moves freely and does not touch
the blade or any other part, in all angles and depths of cut.

b) Check the operation and condition of the guard return
spring. If the guard and the spring are not operating properly,
they must be serviced before use. Guard may operate sluggishly

due to damaged parts, gummy deposits, or a build-up of debris.

c) Assure that the guide plate of the saw will not shift while
performing the “plunge cut” when the blade bevel setting
is not at 90°. Blade shifting sideways will cause binding and likely

kick back.

d) Always observe that the guard is covering the blade before
placing saw down on bench or floor. An unprotected, coasting

blade will cause the saw to walk backwards, cutting whatever is

in its path. Be aware of the time it takes for the blade to stop after
switch is released.

GENERAL SAFETY WARNINGS FOR YOUR LASER

WARNING: Read all safety warnings and all instructions.

Failure to follow the warnings and instructions may result in serious
injury.

Save all warnings and instruc tions for future reference.

These lasers do not normally present an optical hazard although
staring at the beam may cause flash blindness.
Do not stare directly at the laser beam. A hazard may exist if you
deliberately stare into the beam, please observe all safety rules as
follows:

1

The laser shall be used and maintained in accordance with the
manufacturer’s instructions.

2

Never aim the beam at any person or an object other than the work
piece.

3

The laser beam shall not be deliberately aimed at another person
and shall be prevented from being directed towards the eye of a
person for longer than 0.25 seconds area.

4

Always ensure the laser beam is aimed at a sturdy work piece
without reflective surfaces, e.g. wood or rough-coated surfaces
are acceptable. Bright shiny reflective sheet steel or similar is not
suitable for laser applications as the reflective surface may direct
the laser beam back at the operator.

5

Do not change the laser device with a different type. The
manufacturer or an authorized agent must carry out repairs.
CAUTION : Use of controls or adjustments other than those

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specified herein may result in hazardous radiation exposure.

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Symbols

To reduce the risk of injury, user must read instruction
manual.

Warning

Double insulation

Wear eye protection

Wear ear protection

Wear dust mask

Laser radiation

Do not stare into beam

This product has been marked with a symbol relating
to removing electric and electronic waste. This means
that this product shall not be discarded with household
waste but that it shall be returned to a collection
system which conforms to the European Directive
2002/96/CE. It will then be recycled or dismantled in
order to reduce the impact on the environment. Electric
and electronic equipment can be hazardous for the
environment and for human health since they contain
hazardous substances.

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910

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Component list

On/ Off Switch

1

Soft Grip Handle

2

Large L Spanner/ Hex KEY

3

Small L Spanner/Hex KEY

4

Laser On -Off Switch

5

Lock Off Switch

6

Dust Extraction Outlet

7

Depth of Cut Adjustment And Lock Lever

8

Base Plate

9

Saw Blade

10

Parallel Guide Fixture

11

Blade Alignment Indicator

12

Parallel Guide Clamping Screw

13

Protective Blade Guard

14

Laser Guide

15

Battery Storage Cover

16

Spindle Clamping Screw ( See Fig. C )

17

Blade Clamping Washer (See Fig. C )

18

Parallel Guide (See Fig. D)

19

Vacuum Adapter ( See Fig. E)

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21
22
23

Plastic Base Plate Cover (See Fig. F1)

Laser Batteries (Two) (See Fig. J3)

Depth of Cut Indicator

* Not all the accessories illustrated or described are included in

standard delivery.

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Technical data

Vibration Information

Type WU420 (4-designation of machinery, representative of Saw)

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Voltage 230-240V~50Hz

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Power input 400W

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No load speed 3500/min

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Blade size Ø85mm X 15mm

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Max cutting depth 27mm

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Laser battery model no LR44 1.5V

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Protection class /II

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Machine weight 1.5kg

Noise and vibration data

A weighted sound pressure LPA: 80dB(A)

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KPA 3dB(A)

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A weighted sound power LWA: 91dB(A)

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KWA 3dB(A)

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Wear ear protection when sound pressure is over 80dB(A)

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Vibration total values (triax vector sum) determined according to

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EN 60745:

Typical weighted

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vibration

Warning: The vibration emission value during actual use of the

power tool can differ from the declared value depending on the ways
in which the tool is used dependant on the following examples and
other variations on how the tool is used:
How the tool is used and the materials being cut or drilled.
The tool being in good condition and well maintained
The use the correct accessory for the tool and ensuring it is sharp and
in good condition.
The tightness of the grip on the handles and if any anti vibration
accessories are used.
And the tool is being used as intended by its design and these
instructions.

This tool may cause hand-arm vibration syndrome if its use is not
adequately managed.

Warning: To be accurate, an estimation of exposure level in

the actual conditions of use should also take account of all parts of
the operating cycle such as the times when the tool is switched off
and when it is running idle but not actually doing the job. This may
significantly reduce the exposure level over the total working period.

Vibration emission value ah =4.24m/s

Uncertainty K = 1.5m/s²

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Helping to minimise your vibration exposure risk.