Makita DGA404 Instruction Manual page 13

CAUTION:
• Never switch on the tool when it is in contact
with the workpiece, it may cause an injury to
operator.
• Always wear safety goggles or a face shield
during operation.
• After operation, always switch off the tool and
wait until the wheel has come to a complete stop
before putting the tool down.
Grinding and sanding operation
► Fig.19
ALWAYS hold the tool firmly with one hand on housing
and the other on the side handle. Turn the tool on and
then apply the wheel or disc to the workpiece.
In general, keep the edge of the wheel or disc at an
angle of about 15 degrees to the workpiece surface.
During the break-in period with a new wheel, do not work
the grinder in the B direction or it will cut into the workpiece.
Once the edge of the wheel has been rounded off by use,
the wheel may be worked in both A and B direction.
Operation with abrasive cut-off /
diamond wheel
Optional accessory
WARNING:
When using an abrasive cut-off
/ diamond wheel, be sure to use only the special
wheel guard designed for use with cut-off wheels.
(In some European countries, when using a diamond
wheel, the ordinary guard can be used. Follow the
regulations in your country.)
WARNING:
NEVER use cut-off wheel for side grinding.
WARNING:
Do not "jam" the wheel or apply
excessive pressure. Do not attempt to make an exces-
sive depth of cut. Overstressing the wheel increases
the loading and susceptibility to twisting or binding of the
wheel in the cut and the possibility of kickback, wheel
breakage and overheating of the motor may occur.
WARNING:
Do not start the cutting operation
in the workpiece. Let the wheel reach full speed
and carefully enter into the cut moving the tool
forward over the workpiece surface. The wheel
may bind, walk up or kickback if the power tool is
started in the workpiece.
WARNING:
During cutting operations, never
change the angle of the wheel. Placing side pressure
on the cut-off wheel (as in grinding) will cause the wheel
to crack and break, causing serious personal injury.
WARNING:
A diamond wheel shall be oper-
ated perpendicular to the material being cut.
► Fig.20: 1. Lock nut 2. Abrasive cut-off wheel / dia-
mond wheel 3. Inner flange 4. Wheel guard
for abrasive cut-off wheel / diamond wheel
As for the installation, follow the instructions for
depressed center wheel.
The direction for mounting the lock nut and the
inner flange varies by wheel type and thickness.
Refer to the following figures.
For 100 mm (4") model
When installing the abrasive cut-off wheel:
► Fig.21: 1. Lock nut 2. Abrasive cut-off wheel (Thinner
than 4 mm (5/32")) 3. Abrasive cut-off wheel
(4 mm (5/32") or thicker) 4. Inner flange
When installing the diamond wheel:
► Fig.22: 1. Lock nut 2. Diamond wheel (Thinner than
4 mm (5/32")) 3. Diamond wheel (4 mm
(5/32") or thicker) 4. Inner flange
For 115 mm (4 - 1/2") / 125 mm (5") model
When installing the abrasive cut-off wheel:
► Fig.23: 1. Lock nut 2. Abrasive cut-off wheel (Thinner
than 4 mm (5/32")) 3. Abrasive cut-off wheel
(4 mm (5/32") or thicker) 4. Inner flange
When installing the diamond wheel:
► Fig.24: 1. Lock nut 2. Diamond wheel (Thinner than
4 mm (5/32")) 3. Diamond wheel (4 mm
(5/32") or thicker) 4. Inner flange
Operation with wire cup brush
(optional accessory)
CAUTION:
• Check operation of brush by running tool with no load,
insuring that no one is in front of or in line with brush.
• Do not use brush that is damaged, or which is out of
balance. Use of damaged brush could increase poten-
tial for injury from contact with broken brush wires.
► Fig.25: 1. Wire cup brush
Remove the battery cartridge from the tool and place it
upside down allowing easy access to spindle. Remove
any accessories on spindle. Thread wire cup brush onto
spindle and tighten with supplied wrench. When using
brush, avoid applying too much pressure which causes
over bending of wires, leading to premature breakage.
Operation with wire wheel brush
(optional accessory)
CAUTION:
• Check operation of wire wheel brush by running
tool with no load, insuring that no one is in front
of or in line with the wire wheel brush.
• Do not use wire wheel brush that is damaged, or which is
out of balance. Use of damaged wire wheel brush could
increase potential for injury from contact with broken wires.
• ALWAYS use guard with wire wheel brushes,
assuring diameter of wheel fits inside guard.
Wheel can shatter during use and guard helps
to reduce chances of personal injury.
► Fig.26: 1. Wire wheel brush
Remove the battery cartridge from the tool and place it
upside down allowing easy access to spindle. Remove
any accessories on spindle. Thread wire wheel brush
onto spindle and tighten with the wrenches.
When using wire wheel brush, avoid applying too much
pressure which causes over bending of wires, leading
to premature breakage.
13 ENGLISH