Kickback And Related Warnings - Makita 4190D Betriebsanleitung

5. Always use undamaged wheel flanges that are of
correct diameter for your selected wheel. Proper
wheel flanges support the wheel thus reducing the
possibility of wheel breakage.
6. The outside diameter and the thickness of your
wheel must be within the capacity rating of your
power tool. Incorrectly sized wheels cannot be ade-
quately guarded or controlled.
7. The arbour size of wheels and flanges must
properly fit the spindle of the power tool. Wheels
and flanges 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.
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 protective equipment. Depending
on application, use face shield, safety goggles
or safety glasses. As appropriate, wear dust
mask, hearing protectors, gloves and shop
apron capable of stopping small abrasive or
workpiece fragments. The eye protection must be
capable of stopping flying debris generated by vari-
ous operations. The dust mask or respirator must be
capable of filtrating particles generated by your oper-
ation. 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 by insulated gripping surfaces
only, when performing an operation where the
wheel may contact hidden wiring. Wheel contact-
ing a "live" wire may make exposed metal parts of
the power tool "live" and give the operator an electric
shock.
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 spin-
ning 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 acci-
dents, 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 stall-
ing of the rotating wheel which in turn causes the uncon-
trolled 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
workpiece, the edge of the wheel that is entering into the
pinch point can dig into the surface of the material caus-
ing 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 condi-
tions.
Kickback is the result of power tool misuse and/or incor-
rect 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 posi-
tion 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 pres-
sure. Do not attempt to make an excessive depth
of cut. Overstressing the wheel increases the load-
ing 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 to
remove the wheel from the cut while the wheel is
in motion otherwise kickback may occur. Investi-
gate and take corrective action to eliminate the
cause of wheel binding.
8. Do not restart the cutting operation in the work-
piece. Let the wheel reach full speed and care-
fully reenter the cut. The wheel may bind, walk up
or kickback if the power tool is restarted in the work-
piece.
9. Support panels or any oversized workpiece to
minimize the risk of wheel pinching and kick-
back. Large workpieces tend to sag under their own
weight. Supports must be placed under the work-
piece near the line of cut and near the edge of the
workpiece on both sides of the wheel.
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