Safety Warnings Specific For Grinding Operations; General Safety Instructions For Grinders; Specific Safety Rules And Symbols - Hitachi GP 3V Instruction Manual

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e) When using mandrel mounted bonded abrasives,
always have the work securely clamped.
These wheels will grab if they become slightly canted
in the groove, and can kickback. When a mandrel
mounted bonded abrasive grabs, it may jump from the
groove and you could lose control of the tool.
SAFETY WARNINGS SPECIFIC FOR
GRINDING OPERATIONS
a) Use only wheel types that are recommended
for your power tool and only for recommended
applications. For example: do not grind with the
side of a cut-off wheel.
Abrasive cut-off wheels are intended for peripheral
grinding, side forces applied to these wheels may
cause them to shatter.
b) For threaded abrasive cones and plugs use only
undamaged wheel mandrels with an unrelieved
shoulder fl ange that are of correct size and length.
Proper mandrels will reduce the possibility of breakage.
c) Do not "jam" a cut-off 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 snagging of the wheel in the
cut and the possibility of kickback or wheel breakage.
d) Do not position your hand in line with and behind
the rotating wheel.
When the wheel, at the point of operation, is moving
away from your hand, the possible kickback may propel
the spinning wheel and the power tool directly at you.
e) When wheel is pinched, snagged 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 cut-off 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 pinching or snagging.
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.
g) Support panels or any oversized workpiece to
minimize the risk of wheel pinching and kickback.
Large workpieces tend to sag under their own weight.
Supports must be placed under the workpiece near the
line of cut and near the edge of the workpiece on both
sides of the wheel.
h) Use extra caution when making a "pocket cut" into
existing walls or other blind areas.
The protruding wheel may cut gas or water pipes,
electrical wiring or objects that can cause kickback.
6
GENERAL SAFETY INSTRUCTIONS FOR
GRINDERS
– Check that speed marked on the wheel is equal to or
greater than the rated speed of the grinder;
– Ensure that the wheel dimensions are compatible with
the grinder;
– Abrasive wheels shall be stored and handled with care
in accordance with manufacturer's instructions;
– Inspect the grinding wheel before use, do not use
chipped, cracked or otherwise defective products;
– Ensure that mounted wheels and points are fi tted in
accordance with the manufacturer's instructions;
– Ensure that blotters are used when they are provided
with the bonded abrasive product and when they are
required;
– Ensure that the abrasive product is correctly mounted
and tightened before use and run the tool at no-load
for 30 s in a safe position, stop immediately if there is
considerable vibration or if other defects are detected. If
this condition occurs, check the machine to determine
the cause;
– If a guard is equipped with the tool never use the tool
without such a guard;
– Do not use separate reducing bushings or adapters to
adapt large hole abrasive wheels;
– For tools intended to be fi tted with threaded hole wheel,
ensure that the thread in the wheel is long enough to
accept the spindle length;
– Secure the workpiece and check that the workpiece
is properly supported. A workpiece clamped with
clamping devices or in a vice is held more securely
than by hand;
– Do not use cutting off wheel for side grinding;
– Ensure that sparks resulting from use do not create
a hazard e.g. do not hit persons, or ignite fl ammable
substances;
– Ensure that ventilation openings are kept clear when
working in dusty conditions, if it should become
necessary to clear dust, fi rst disconnect the tool from
the mains supply (use non metallic objects) and avoid
damaging internal parts;
– Always use eye and ear protection. Other personal
protective equipment such as dust mask, gloves,
helmet and apron should be worn;
– Pay attention to the wheel that continues to rotate after
the tool is switched off .

SPECIFIC SAFETY RULES AND SYMBOLS

1. ALWAYS use proper guard with grinding wheel.
A guard protects operator from broken wheel fragments.
2. Accessories must be rated for at least the speed
recommended on the tool warning label.
Wheels and other accessories running over rated
speed can fl y apart and cause injury.
3. Hold tools by insulated gripping surfaces when
performing an operation where the cutting tool
may contact hidden wiring or its own cord.