8
CONCRETE GRINDER SAFETY WARNINGS (cont.)
t) Use clamps or another practical way to secure and support the workpiece to a stable platform.
Holding the work by hand or against your body leaves it unstable and may lead to loss of control.
u) Avoid bouncing the wheel or giving it rough treatment.
If this occurs, stop the tool and inspect the
wheel for cracks or flaws.
v)
Always handle and store wheels in a careful manner.
w) Do not operate this tool for long periods of time.
Vibration caused by the operating action of this
tool may cause permanent injury to fingers, hands, and arms. Use gloves to provide extra cushion, take
frequent rest periods, and limit daily time of use.
x) Air vents often cover moving parts and should be avoided
. Loose clothes, jewelry or long hair can
be caught in moving parts.
Kickback and Related Warnings
Kickback is a sudden reaction to a pinched or snagged rotating wheel, backing pad, brush or any other
accessory. Pinching or snagging causes rapid stalling of the rotating accessory which in turn causes the
uncontrolled power tool to be forced in the direction opposite of the accessory’s rotation at the point of
the binding.
For example, if an abrasive wheel is snagged or pinched by the work piece, 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. 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. 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.
b) Never place your hand near the rotating accessory.
Accessory may kickback over your hand.
c) Do not position your body in the area where power tool will move if kickback occurs.
Kickback will
propel the tool in direction opposite to the wheel’s movement at the point of snagging.
d) Use special care when working corners, sharp edges etc. Avoid bouncing and snagging the
accessory.
Corners, sharp edges or bouncing have a tendency to snag the rotating accessory and cause
loss of control or kickback.
e) Do not attach a saw chain woodcarving blade or toothed saw blade.
Such blades create frequent
kickback and loss of control.
Additional safety instructions for grinding and cutting-off operations
Safety Warnings Specific for Grinding and Abrasive Cutting-Off Operations:
a) Use only wheel types that are recommended for your power tool and the specific guard designed
for the selected wheel.
Wheels for which the power tool was not designed cannot be adequately
guarded and are unsafe.
b) The grinding surface of centre depressed wheels must be mounted below the plane of the
guard lip.
An improperly mounted wheel that projects through the plane of the guard lip cannot be
adequately protected.
c) The guard must be securely attached to the power tool and positioned for maximum safety, so
the least amount of wheel is exposed towards the operator.
The guard helps to protect operator
from broken wheel fragments and accidental contact with wheel.
NOTE:
The above warning may be omitted for die grinders and grinders or cut-off grinders with rated
capacity of less than 55mm.
d) Wheels must be used only for recommended applications. For example: do not grind with the
side of cut-off wheel.
Abrasive cut-off wheels are intended for peripheral grinding, side forces applied
to these wheels may cause them to shatter.
e) Always use undamaged wheel flanges that are of correct size and shape for your selected wheel.
Proper wheel flanges support the wheel thus reducing the possibility of wheel breakage. Flanges for
cut-off wheels may be different from grinding wheel flanges.
f) Do not use worn down wheels from larger power tools.
Wheel intended for larger power tool is not
suitable for the higher speed of a smaller tool and may burst.
