English
49
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 su
ffi
ciently 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. Their dimensions and
shapes are shown in “SELECTING ACCESSORIES” on page 53.
Since wheel shaft diameter is 3 mm, use the collet chuck for 3 mm shaft sold separately by your
HiKOKI 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.
000Book̲GP18DA̲ChS.indb 49
000Book̲GP18DA̲ChS.indb 49
2021/03/15 19:31:09
2021/03/15 19:31:09