Prior To Operation; How To Attach The Tip Tool; Operating The Grinder - Hitachi GP 10DL Handling Instructions Manual

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PRIOR TO OPERATION

1. Setting up and checking the work environment
Check if the work environment is suitable by the above
precautions.

HOW TO ATTACH THE TIP TOOL

WARNING
To prevent accidents, be sure to switch the power off
and remove the battery from the grinder.
CAUTION
Make sure the mandrel is screwed in tightly.
After attaching the tip tool, check that the tool is
securely fi xed.
If the tool is loose, it may come off , causing damage or
injury.
1. How to use the screw-type mandrel (Fig. 6 (a))
Use the screw-type mandrel when using the felt
polishing wheel.
Keeping the wheel straight, screw it onto the thread of
the screw-type mandrel as far as the fl ange.
2. How to use the wheel mandrel (Fig. 6 (b))
Remove the screw in the end of the mandrel with a
fl athead screwdriver and attach the cutting wheel or
sanding disc.
3. How to use the drum mandrel (Fig. 6 (c))
A 60-grit sanding band is fi tted to the drum mandrel
when it leaves the factory.
Loosen the screw in the end of the mandrel with a
screwdriver to remove/attach the sanding band.
After attaching the sanding band, tighten the screw
securely.
4. Attach the tip tool to the grinder
Rotate the collet nut by hand while pressing the lock
button to further depress the lock button.
In this state, the shaft is locked and the collet nut can
be loosened or tightened. (Fig. 7)
To attach the tip tool, insert the tip tool as far as it will
go and tighten the collet nut securely.
To detach the tip tool, the collet nut can usually be
rotated by hand, though occasionally it may be tight.
If the collet nut is tight, use the provided collet spanner
to loosen it.
Iron powder on the collet nut, collet or shaft screw may
cause the collet nut to be diffi cult to rotate. (Fig. 8)
Be sure to remove any powder before attaching or
detaching the tip tool.
NOTE
Very occasionally, the tip tool may be diffi cult to detach
from the collet.
If this happens, with the collet nut loosened, press the
end of the tool lightly against a hard object. (Fig. 10)
5. Balance adjustment of the tip tool
After attaching the tip tool, operate the grinder at low
speed. If the balance is not right, follow the procedure
below to adjust the balance.
Loosen the collet nut while pressing the lock button.
Next, rotate the tip tool by 1/4 and tighten the collet nut.
Operate the grinder at low speed and check the
balance. If the balance is right, adjustment is
completed.
If the balance still is not right, detach the tip tool, the
collet nut and collet and re-attach them. If the tip tool
is still not balanced after several such attempts, check
for deformation or wear of the tip tool or deformation of
the collet. If worn or deformed, replace the tip tool or
collet.
12

OPERATING THE GRINDER

WARNING
○ Keep your face away from the tip tool during use.
○ Wear goggles and a dust mask when using the grinder.
Breakage of the tip tool may lead to injury.
○ Do not operate the grinder at extremely slow speed. A
smooth fi nished surface will not be achieved and doing
so may lead to damage of the tip tool, breakdown of the
grinder or injury.
CAUTION
Do not touch the tip tool, collet nut or collet immediately
after machining as they will be very hot and touching
them may result in burns.
1. Remove the battery and attach the tip tool
2. Fix the workpiece so that it does not move
The smaller the workpiece, the more unstable it is to
machine. Fix small workpieces in a vise.
Holding the workpiece by hand may result in injury.
3. Insert the battery in the grinder
4. Check the balance of the tip tool
Check the tip tool visually at low speed (around [1] on
the switch dial).
Also check for abnormal noise during operation.
5. Select the machining speed
○ Select the optimal speed for the material while
performing trial grinding with reference to Table 2.
○ If plastic is machined at high speed, it may melt due to
heating. Test it gradually starting from a low speed.