Makita 4190D Instruction Manual page 4

may cause loss of control.
8. Do not use damaged wheels. Before each use,
inspect the wheels for chips and cracks. If
power tool or wheel is dropped, inspect for
damage or install an undamaged wheel. After
inspecting and installing the wheel, position
yourself and bystanders away from the plane
of the rotating wheel and run the power tool at
maximum no load speed for one minute.
Damaged wheels will normally break apart during
this test time.
9. Wear personal
Depending on application, use face shield,
safety goggles
appropriate, wear
protectors, gloves and shop apron capable of
stopping small
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.
10. 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 wheel may
fly away and cause injury beyond immediate area
of operation.
11. Hold power tool
surfaces only, when performing an operation
where the wheel may contact hidden wiring or
its own cord. Wheel contacting a "live" wire may
make exposed metal parts of the power tool "live"
and shock the operator.
12. Position the cord clear of the spinning wheel.
If you lose control, the cord may be cut or
snagged and your hand or arm may be pulled into
the spinning wheel.
13. Never lay the power tool down until the wheel
has come to a complete stop. The spinning
wheel may grab the surface and pull the power
tool out of your control.
14. Do not run the power tool while carrying it at
your side. Accidental contact with the spinning
wheel could snag your clothing, pulling the wheel
into your body.
15. 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.
16. Do not operate the power tool near flammable
materials. Sparks could ignite these materials.
17. Never attempt to cut with the tool held upside
down in a vise. This can lead to serious
protective equipment.
or safety glasses.
dust mask, hearing
abrasive or workpiece
by insulated gripping
accidents, because it is extremely dangerous.
18. Some material contains chemicals which may
be toxic. Take caution to prevent dust
inhalation and skin contact. Follow material
supplier safety data.
Kickback and related warnings
Kickback is a sudden reaction to a pinched or snagged
rotating wheel. Pinching or snagging causes rapid
stalling of the rotating wheel which in turn causes the
uncontrolled power tool to be forced in the direction
opposite of the wheel's rotation at the point of the
binding.
For example, if a wheel is snagged or pinched by the
As
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. The 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.
1. 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 reactions or
kickback forces, if proper precautions are taken.
2. Never place your hand near the rotating wheel.
Wheel may kickback over your hand.
3. Do not position your body in line with and
behind the rotating wheel. Kickback will propel
the tool in direction opposite to the wheel's
movement at the point of snagging.
4. Use special care when working corners, sharp
edges etc. Avoid bouncing and snagging the
wheel. Corners, sharp edges or bouncing have a
tendency to snag the rotating wheel and cause
loss of control or kickback.
5. Do not attach a saw chain woodcarving blade
or toothed saw blade. Such blades create
frequent kickback and loss of control.
6. Do not "jam" the wheel or apply excessive
pressure.
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.
7. 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
4
Do not attempt to make an