Practical Grinder Application - Hitachi Koki G 13YC Handling Instructions Manual

English
5. Ensure that m ounted w heels and points are fitted
in accordance w ith the m anufacturer's instructions.
Ensure that the depressed center w heel to be utilized
is the correct type and free of cracks or surface
defects. Also ensure that the depressed center w heel
is properly m ounted and the w heel nut is securely
tightened, Refer to the section on " Depressed Center
Wheel Assem bly"
Ensure that blotters are used w hen they are provided
w ith the bonded abrasive product and w hen they
are required.
Do not use separate reducing bushings or adaptors
to adapt large hole abrasive w heels.
For tools intended to be fitted w ith threaded hole
w heel, ensure that the thread in the w heel is long
enough to accept the spindle length.
Do not use cutting off w heel for side grinding.
6. Conducting a trial run
Ensure that the abrasive products is correctly
m ounted and tightened before use and run the tool
at no-load for 30 seconds in a safe position, stop
im m ediately if there is considerable vibration or if
other defects are detected.
If this condition occurs, check the m achine to
determ ine the cause.
7. Confirm the spindle lock mechanism.
Confirm that the spindle lock is disengaged by
pushing push button tw o or three tim es before
sw itching the pow er tool on (See Fig. 1).
8. Fixing the side handle
Screw the side handle into the gear cover.

PRACTICAL GRINDER APPLICATION

1. Grinding Pressure
Do not apply the depressed center w heel strongly
to the grinding surface. The grinder m akes use of
electronic cricuit, so during application of load rotates
at high speed, so am ple grinding effect can be
obtained by applying light pressure. If a strong
grinding pressure or other abnorm al load is applied,
the overload protection circuit w ill operate and m ake
the grinder stop rotating, so please stop applying
load im m ediately. Follow ing this, sw itching the
power OFF and then ON again, will cause the rotation
to increase to the regular speed.
2. Grinding angle
Do not apply the entire surface of the depressed
center w heel to the m aterial to be ground. As
show n in Fig. 3, the m achine should be held at an
angle of 15° – 30° so that the external edge of the
depressed center w heel contacts the m aterial at an
optim um angle.
3. To prevent a new depressed center w heel from
digging into the w orkpiece, initial grinding should
be perform ed by draw ing the grinder across the
w orkpiece tow ard the operator (Fig. 3 direction B).
Once the leading edge of the depressed center
w heel is properly abraded, grinding m ay be
conducted in either direction.
4. Sw itch operation
[When the sw itch has locking m echanism ]
Sw itch ON: To sw itch on, slide the lock lever in
the direction of A and press the paddle
lever in the direction of B as show n
in Fig. 4-a.
6
Furtherm ore, slide the lock lever in the
direction of C show n in Fig. 4-b w hile
pressing the paddle lever to lock and
enable continuous operation.
Sw itch OFF: To release the locking m ode, press the
paddle lever in the direction of B
show n in Fig. 4-a, and release the
paddle lever to sw itch off.
[When the sw itch has no locking m echanism ]
To sw itch on, slide the lock lever in the direction
of A and press the paddle lever in the direction
of B as show n in Fig. 4-a. Release the paddle lever
to sw itch off.
NOTE: The paddle lever can not be locked.
5. Precautions immediately after finishing operation
The w heel continues to rotate after the tool is
sw itched off.
After sw itching off the m achine, do not put it dow n
until the depressed center w heel has com e to a
co m p l et e st o p . A p ar t f r o m av o i d i n g ser i o u s
accidents, this precaution w ill reduce the am ount
of dust and sw arf sucked into the m achine.
CAUTIONS
Check that the w ork piece is properly supported.
Ensure that ventilation openings are kept clear w hen
w orking in dusty conditions.
If it should becom e necessary to clear dust, first
disconnect the tool from the m ains supply (use non-
m etallic objects) and avoid dam aging internal parts.
Ensure that sparks resulting from use do not create
a hazard e.g. do not hit persons, or ignite flam m able
substances.
Alw ays use protective safety glasses and hearing
protectors, use other personal protective equipm ent
such as gloves, apron and helm et w hen necessary.
Alw ays use eye and ear protection.
Other personal protective equipm ent such as dust
m ask, gloves, helm et and apron should be w orn
w hen necessary.
If in doubt, w ear the protective equipm ent.
When the m achine is not use, the pow er source
should be disconnected.
ASSEM BLING AND DISASSEM BLING THE
DEPRESSED CENTER WHEEL (Fig. 1)
CAUTION Be sure to sw itch OFF and disconnect the
attachm ent plug from the receptacle to avoid
a serious accident.
1. Assembling (Fig. 1)
(1) Turn the disc grinder upsidedow n so that the spindle
is facing upw ard.
(2) Align the across flats of the w heel w asher w ith the
notched part of the spindle, then attach them .
(3) Fit the protuberance of the depressed center w heel
or diam ond w heel onto the w heel w asher.
(4) Screw the w heel nut onto the spindle.
(For diam ond w heel assem bling, use the w heel nut
w ith the convex side against the diam ond w heel).
(5) While pushing the push button w ith one hand, lock
the spindle by turning the depressed center w heel
slow ly w ith the other hand.
Tighten the w heel nut by using the supplied w rench
as show n in Fig. 1.