Koki Holdings Hikoki GP 18DA, Handling Instructions Manual

Page: 13 / 24

13
Caution when using near welding equipment
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.
Precautions on 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.
CAUTION
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).
(2) Dressing the wheel
After attaching a wheel, correct 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 spoil the fi nishing surface or
lower grinding e ffi ciency. Occasionally dress the wheel
by applying the dresser.
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”.
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.
MAINTENANCE AND INSPECTION
WARNING
Be sure to turned o ff the switch and remove the battery
before maintenance and inspection.
1. Inspecting the wheel
Ensure that the wheel is free of cracks and surface
defects.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure that
they are properly tightened. Should any of the screws be
loose, retighten them immediately. Failure to do so could
result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very “heart” of the power
tool. Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Inspection of terminals (tool and battery)
Check to make sure that swarf and dust have not
collected on the terminals.
On occasion check prior, during and after operation.
CAUTION
Remove any swarf or dust which may have collected on
the terminals.
Failure to do so may result in malfunction.
5. Cleaning on the outside
When the power tool is stained, wipe with a soft dry cloth
or a cloth moistened with soapy water. Do not use chloric
solvents, gasoline or paint thinner, for they melt plastics.
6. Cleaning the fi lter
After use, detach the fi lter and remove any grime or dust
from the screen with an airgun or other tool. ( Fig. 10 )
NOTE
○ To clear the unit of grime or dust, periodically run
the motor in a no-load state and blow dry air into the
ventilation hole with the fi lter removed.
Accumulation of grime or dust accumulates in the motor
can cause damage.
○ After cleaning, make sure to securely attach the fi lter.
7. Storage
Store the power tool in a place in which the temperature
is less than 40°C and out of reach of children.
NOTE
Storing lithium-ion batteries.
Make sure the lithium-ion batteries have been fully
charged before storing them.
Prolonged storage (3 months or more) of batteries with
a low charge may result in performance deterioration,
signi fi cantly reducing battery usage time or rendering
the batteries incapable of holding a charge.
However, signi fi cantly reduced battery usage time may
be recovered by repeatedly charging and using the
batteries two to fi ve times.
If the battery usage time is extremely short despite
repeated charging and use, consider the batteries dead
and purchase new batteries.
00Book̲GP18DA̲UK.indb 13 00Book̲GP18DA̲UK.indb 13 2021/03/04 15:38:11 2021/03/04 15:38:11