18
English
CAUTION
●
When using the grinder in the immediate vicinity
of welding equipment, the rotational speed may
become unstable. Do not use the grinder near
welding equipment.
●
When using the tool at any value except the
full speed (Dial scale 5), the motor cannot
be sufficiently cooled due to the decreased
number of revolution. This could result in the
risk of burning and damaging the motor before
an overload protective mechanism starts to
function. Make sure that you use the tool by lightly
applying it to the surface of material when you use
it at any value except the full speed (Dial scale 5).
WARNING
Do not press the grinder forcibly against the
surface to be ground. Heavy pressure can result
in wheel breakage and serious injury. It can also
damage the surface being ground or damage the
grinder’s motor.
3. Wheel selecting method
Types of wheels are varied according to the materials
to be ground. Select a wheel appropriate for the
material to be ground.
The following table is an outline of wheels and
materials to be ground.
Materials to be ground
Grain
Grading
Bonding
degree
Structure
Bonding agent
Mild steel, hard steel,
forged steel
WA
60–80
P
m
V
Cast iron
C
36
M–O
m
V
Brass, bronze, aluminium
C
36
J–K
m
V
Ceramic
WA
60–80
M
m
V
Synthetic resin
C
36
K–M
m
V
Small-scaled wheels with shaft are prepared for grinding small surfaces.
Since wheel shaft diameter is 3 mm, use the collet chuck for 3 mm shaft sold separately by your metabo HPT dealer as
an optional accessory.
4. Grinding
operation
(1) Lightly press the wheel to the material to be ground
when grinding materials, high-speed revolution
is necessary. Use a die grinder with high-speed
revolution, minimizing the pressing force.
(2) Dressing the wheel
After attaching a wheel, adjust de
fl
ection of the wheel
center by using a dresser.
If the wheel center is eccentric, not only precise
fi
nishing cannot be achieved but also grinder vibration
increases, lowering grinder accuracy and durability.
A clogged or worn wheel will soil the
fi
nishing surface
or lower grinding e
ffi
ciency. Occasionally dress the
wheel by applying the dresser.
(3) Thorougly check that the wheel is free of cracks, splits
and other abnomalities before mounting. Make sure it
is
fi
rmly clamped and has been properly mounted.
(4) Test the die grinder before using.
Before actually beginning the grinding work, test
the die grinder by
fi
rst clearing the area of all other
personnel. Make sure you are wearing eye protection.
Turn the die grinder “on”, and make sure the die grinder
runs smoothly and shows no abnormalities.
Duration of the trial run is as follows:
When depressed center wheel is replaced .......
3 minutes or more
When starting daily work .......1 minute or more
(5) Use only properly rated wheels.
Use only depressed center wheels rated at
29,000 /min or more.
Using a wheel rated less can lead to wheel
disintegration during operation and cause serious
bodily injury.
CAUTION
The revolving wheel will create air turbulence.
Do no lay the die grinder down in areas of dust
or dirt until it has come to a complete stop.
00Book̲GP18DA̲NA.indb 18
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2021/03/04 16:27:55
2021/03/04 16:27:55
