Manual Hikoki GP18DA (page 7 of 240) (All languages)

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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 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 power tool misuse and/or incorrect

operating procedures or conditions and can be avoided by

taking proper precautions as given below.

a) Maintain a ﬁ rm grip on the power tool and position

your body and arm to allow you to resist kickback

forces.

The operator can control kickback forces, if proper

precautions are taken.

b) 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.

c) Do not attach a toothed saw blade.

Such blades create frequent kickback and loss of

control.

d) Always feed the bit into the material in the same

direction as the cutting edge is exiting from the

material (which is the same direction as the chips

are thrown).

Feeding the tool in the wrong direction causes the cutting

edge of the bit to climb out of the work and pull the tool in

the direction of this feed.

e) When using rotary ﬁ les, cut-oﬀ wheels, high-speed

cutters or tungsten carbide cutters, always have

the work securely clamped.

These wheels will grab if they become slightly canted

in the groove, and can kickback. When a cut-oﬀ wheel

grabs, the wheel itself usually breaks. When a rotary ﬁ le,

high-speed cutter or tungsten carbide cutter grabs, it

may jump from the groove and you could lose control of

the tool.

SAFETY WARNINGS SPECIFIC FOR

GRINDING AND ABRASIVE CUTTING-

OFF 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.

GENERAL SAFETY INSTRUCTIONS

FOR CORDLESS GRINDER

– 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 seconds 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;

– Check that the work piece is properly supported;

– 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;

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Hikoki GP18DA Manual

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