h)
Do not use damaged wheels. Before each use, inspect the wheels for chips and cracks. If the
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.
i)
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 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.
j)
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.
k)
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 wheel.
l)
Regularly clean the power tool’s air vents.
The motor’s fan can draw the dust inside the housing
and excessive accumulation of powdered metal may cause electrical hazards.
m)
Do not operate the power tool near flammable materials. Do not operate the power tool while
placed on a combustible surface such as wood.
Sparks could ignite these materials.
n)
Do not use accessories that require liquid coolants.
Using water or other liquid coolants may
result in electrocution or shock.
2) 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 cutting unit to be forced upwards
toward the operator.
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. 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.
The operator can control upward kickback forces, if proper precautions are taken.
b)
Do not position your body in line with the rotating wheel.
If kickback occurs, it will propel the
cutting unit upwards toward the operator.
c)
Do not attach a saw chain, woodcarving blade, segmented diamond wheel with a peripheral
gap greater than 10 mm or toothed saw blade.
Such blades create frequent kickback and loss of
control.
d)
Do not “jam” the 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.
e)
When the wheel is binding or when interrupting a cut for any reason, switch off the power tool
and hold the cutting unit 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.
Investigate and take corrective action to eliminate the cause of wheel binding.
f)
Do not restart the cutting operation in the workpiece. Let the wheel reach full speed and
carefully re-enter the cut.
The wheel may bind, walk up or kickback if the power tool is restarted in the
workpiece.
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