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d) The outside diameter and the thickness of your accessory must be within
the capacity rating of your power tool. Incorrectly sized accessories cannot be
adequately guarded or controlled.
e) The arbor size of wheels, flanges, backing pads or any other accessory
must properly fit the spindle of the power tool. Accessories with arbor 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.
f) Do not use a damaged accessory. Before each use inspect the accessory
such as abrasive wheel for chips and cracks, backing pad for cracks, tear
or excess wear, wire brush for loose or cracked wires. If power tool or
accessory is dropped, inspect for damage or install an undamaged
accessory. After inspecting and installing an accessory, position yourself
and bystanders away from the plane of the rotating accessory and run the
power tool at maximum no-load speed for one minute. Damaged accessories
will normally break apart during this test time.
g) Wear personal protective equipment. Depending on application, use face
shield, safety goggles or safety glasses. As appropriate, wear dust mask,
hearing protectors, gloves and work 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.
h) 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 accessory may fly away and cause injury beyond immediate area
of operation.
i) Hold power tool by insulated gripping surfaces only, when performing an
operation where the cutting accessory may contact hidden wiring or its own
cord. Cutting accessory contacting a “live” wire may make exposed metal parts of
the power tool “live” and shock the operator.
j) Never lay the power tool down until the accessory has come to a complete
stop. The spinning accessory may grab the surface and pull the power tool out of
your control.
k) Do not run the power tool while carrying it at your side. Accidental contact
with the spinning accessory could snag your clothing, pulling the accessory into
your body.
l) 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.
m)Do not operate the power tool near flammable materials. 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.
o) Do not use Type 11 (flaring cup) wheels on this tool. Using inappropriate
accessories can result in injury.
p) Always use side handle. Tighten the handle securely. The side handle should
always be used to maintain control of the tool at all times.
CAUSES AND OPERATOR PREVENTION OF KICKBACK
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 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. Abrasive wheels may also break under these
conditions.
Kickback is the result of tool misuse and/or incorrect operating procedures or
conditions and can be avoided by taking proper precautions as given below: