Makita DGA455 Betriebsanleitung Seite 17

Installing dust collecting wheel
guard for grinding
Only for model DGA455 / DGA505
Optional accessory
With optional accessories, you can use this tool for
planing concrete surface.
CAUTION:
Dust collecting wheel guard for
grinding is only for use in planing concrete sur-
face with a cup-type diamond wheel. Do not use
this guard with any other cutting accessory or for
any other purpose.
CAUTION:
Before operation, make sure that
a vacuum cleaner is connected to the tool and
turned on.
Place the tool upside down and install the dust collect-
ing wheel guard.
Mount the inner flange onto the spindle.
Fit the cup-type diamond wheel on the inner flange and
tighten the lock nut onto the spindle.
► Fig.29: 1. Lock nut 2. Cup-type diamond wheel
3. Hubbed cup-type diamond wheel 4. Inner
flange 5. Dust collecting wheel guard
6. Bearing box
NOTE: For information how to install the dust col-
lecting wheel guard, refer to the manual of the dust
collecting wheel guard.
Installing dust collecting wheel
guard for cutting-off
Optional accessory
With optional accessories, you can use this tool for
cutting stone materials.
► Fig.30
NOTE: For information how to install the dust col-
lecting wheel guard, refer to the manual of the dust
collecting wheel guard.
OPERATION
WARNING:
It should never be necessary to
force the tool. The weight of the tool applies ade-
quate pressure. Forcing and excessive pressure
could cause dangerous wheel breakage.
WARNING:
ALWAYS replace wheel if tool is
dropped while grinding.
WARNING:
NEVER hit the workpiece with the wheel.
WARNING:
Avoid bouncing and snagging the
wheel, especially when working corners, sharp
edges etc. This can cause loss of control and kickback.
WARNING:
NEVER use tool with wood cutting
blades and other saw blades. Such blades when
used on a grinder frequently kick and cause loss of
control leading to personal injury.
CAUTION:
Never switch on the tool when it
is in contact with the workpiece, it may cause an
injury to operator.
CAUTION:
Always wear safety goggles or a
face shield during operation.
CAUTION:
After operation, always switch off
the tool and wait until the wheel has come to a
complete stop before putting the tool down.
CAUTION:
ALWAYS hold the tool firmly with
one hand on housing and the other on the side
grip (handle).
NOTE: A dual purpose wheel can be used for both
grinding and cutting-off operations.
Refer to the "Grinding and sanding operation" for
grinding operation, and refer to the "Operation with
abrasive cut-off / diamond wheel" for cutting-off
operation.
Grinding and sanding operation
► Fig.31
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° to the workpiece surface.
During the break-in period with a new wheel, do not
work the grinder in forward direction or it may cut into
the workpiece. Once the edge of the wheel has been
rounded off by use, the wheel may be worked in both
forward and backward direction.
Usage example: operation with cup-type diamond
wheel
► Fig.32
Keep the tool horizontally and apply the entire cup-type
diamond wheel to the workpiece surface.
Operation with abrasive cut-off /
diamond wheel
Optional accessory
WARNING:
excessive pressure. Do not attempt to make an
excessive 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:
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:
change the angle of the wheel. Placing side pres-
sure on the cut-off wheel (as in grinding) will cause
the wheel to crack and break, causing serious per-
sonal injury.
WARNING:
ated perpendicular to the material being cut.
17 ENGLISH
Do not "jam" the wheel or apply
Do not start the cutting operation
During cutting operations, never
A diamond wheel shall be oper-