Cutting Metal - DeWalt DWE490 Original Instructions Manual

English
• Never work with the grinding cup without a suitable
protection guard in place.
• Do not use the power tool with a cut-off stand.
• Never use blotters together with bonded
abrasive products.
• Be aware, the wheel continues to rotate after the tools
is switched off.
• The tool is not designed to be used with a
grinding cup.
• Do not use separate reducing bushings or adapters to
adapt large hole abrasive wheels.
Proper Hand Position (Fig. A, G)

WARNING: To reduce the risk of serious personal injury,
ALWAYS use proper hand position as shown.

WARNING: To reduce the risk of serious personal
injury, ALWAYS hold securely in anticipation of a
sudden reaction.
Proper hand position requires one hand on the side handle
with the other hand on the body of the tool, as shown in
Figure G.
Switching On and Off (Fig. A)
The on/off switch is equipped with an unlocking switch.
To run the tool, depress the lock-off button
operate the on/off trigger 1 .
2
Release the lock-off button .To stop the tool, release
the switch.
Lock-on Button (Fig. A)
DWE494 Only
For continuous operation depress the lock-on button
release the on/off trigger switch.
To stop the tool press the on/off switch again.
The lock-on button can be permanently removed without
compromising compliance with regulatory agencies shown on
the tool's nameplate. Removal of the lock pin must be done by a
D WALT Service Centre.
e
Spindle Lock (Fig. A)
3
The spindle lock is provided to prevent the spindle from
rotating when installing or removing wheels. Operate the
spindle lock only when the tool is turned off, unplugged from
the power supply, and has come to a complete stop.
NOTICE: To reduce the risk of damage to the tool, do
not engage the spindle lock while the tool is operating.
Damage to the tool will result and attached accessory
may spin off possibly resulting in injury.
To engage the lock, depress the spindle lock button and rotate
the spindle until you are unable to rotate the spindle further.
Metal Applications
When using the tool in metal applications, make sure that a
residual current device (RCD) has been inserted to avoid residual
risks caused by metal swarf.
10
If the power supply is shut off by the RCD, take the tool to
authorised D

To avoid build-up of metal swarf inside the machine, we
recommend to clear the ventilation slots on a daily basis. Refer
to Maintenance.

Cutting Metal

For cutting with bonded abrasives, always use a
protection guard type 1.
When cutting, work with moderate feed, adapted to the
material being cut. Do not exert pressure onto the cutting disc,
tilt or oscillate the machine.
Do not reduce the speed of running down cutting discs by
applying sideward pressure.
7
,
The machine must always work in an upgrinding motion.
Otherwise, the danger exists of it being pushed uncontrolled
out of the cut.
When cutting profiles and square bar, it is best to start at the
smallest cross section.
2
and subsequently
Rough Grinding
never use a cutting disc for roughing.
Always use the guard type 27.
The best roughing results are achieved when setting the
machine at an angle of 30° to 40°. Move the machine back and
forth with moderate pressure. In this manner, the workpiece
will not become too hot, does not discolour and no grooves
8
and
are formed.
Cutting Stone
The machine shall be used only for dry cutting. For cutting
stone, it is best to use a diamond cutting disc. Operate the
machine only with additional dust protection mask.
Working Advice
Exercise caution when cutting slots in structural walls.
Slots in structural walls are subject to the country-specific
regulations. These regulations are to be observed under all
circumstances. Before beginning work, consult the responsible
structural engineer, architect or the construction supervisor.
Using Flap Discs

WALT repair agent.
e
WARNING: In extreme working conditions, conductive
dust can accumulate inside the machine housing when
working with metal. This can result in the protective
insulation inthe machine becoming degraded with a
potential risk of an electrical shock.
WARNING: Metal dust build-up. Extensive use of flap
discs in metal applications can result in the increased
potential for electric shock. To reduce this risk, insert an
RCD before use and clean the ventilation slots daily by
blowing dry compressed air into the ventilation slots
inaccordance with the below maintenance instructions.