Rough Grinding - DeWalt DW831 Original Instructions Manual

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WARNING: Ensure all materials to be ground or cut are
secured in place.
• Use clamps or a vice to hold and support the workpiece to
a stable platform. It is important to clamp and support the
workpiece securely to prevent the movement of the workpiece
and loss of control. Movement of the workpiece or loss of
control may create a hazard and cause personal injury.
• Secure the workpiece. A workpiece clamped with clamping
devices or in a vice is held more secure than by hand.
• Support panels or any oversized workpiece to minimize the
risk of wheel pinching and kickback. Large workpieces tend to
sag under their own weight. Supports must be placed under
the workpiece near the line of cut and near the edge of the
workpiece on both sides of the wheel.
• Always wear regular working gloves while operating this tool.
• The gear case becomes very hot during use.
• Apply only a gentle pressure to the tool. Do not exert side
pressure on the disc.
• Avoid overloading. Should the tool become hot, let it run a few
minutes under no load condition to cool the accessory. Do not
touch accessories before they have cooled. The discs become
very hot during use.
• Do not use separate reducing bushings or adapters to adapt
large hole abrasive wheels.
• Never use the tool without the guard in place.
• The tool is not designed to be used with a grinding cup.
• 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
Proper Hand Position (Fig. A, I)

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 I.
Switching On and Off (Fig. H)

WARNING: Before using tool, check that the handle is
tightened securely.

CAUTION: Hold the side handle and body of the tool
firmly to maintain control of the tool at start up and
during use and until the wheel or accessory stops rotating.
Make sure the wheel has come to a complete stop be fore
laying the tool down.
• To run the tool, press the lock-off button
switch 1 .
• To stop the tool, release the On/Off switch.

WARNING: Do not switch the tool On or Off when
under load.
30
Spindle Lock (Fig. A)
The spindle lock
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.
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.
See Maintenance.
Using Flap Discs


Rough Grinding

never use a cutting disc for roughing.
always use the guard type 27.
3 , 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
are formed.
MAINTENANCE
Your D
over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper tool
care and regular cleaning.

2 and the On/Off
is provided to prevent the spindle from
5
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 in the 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.
WALT power tool has been designed to operate
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WARNING: To reduce the risk of serious personal
injury, turn tool off and disconnect tool from power
source before making any adjustments or removing/
installing attachments or accessories. Be sure the
trigger switch is in the OFF position. An accidental start-up
can cause injury.