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Wire cup brushes should be used without a
guard, or with the guard type recommended
by the wire cup brush manufacturer. Wire cup
brushes expand during use; wires bristles con-
tacting the guard could break and be thrown,
causing injury.
Wire cup brush
Always install wire brushes according to the acces-
sory manufacturer's instructions. Only use acces-
sories with threads matching the tool's spindle.
Test wire brushes for balance and loose or damaged
wires by letting it spin for one minute before applying
it to the workpiece. During this time, no one should
stand in front of or in line with it.
Only allow the tip of the wire brush to contact the
workpiece. Do not contact the sides of the wire brush
to the workpiece. Wires will be damaged and could
break and be thrown.
Control pressure and surface contact between wire
brushes and workpiece. Too much pressure causes
over-bending of wires and heat build-up causing
premature wire breaking, rapid dulling and reduced
brush life. Instead of more pressure, try a wire brush
with more aggressive cutting action (increased wire
size, decreased wire length, or different brush type
(knot type vs. crimped wire type).
Using Sanding Discs
Hold tool at 5° to 15° angle to ensure proper sanding
pressure and control. Too great an angle will result
in too much pressure and could cause excessive
wear to the disc and workpiece. Too small an angle
will reduce control.
Use long, sweeping, side to side strokes, advancing
forward to produce the desired finish.
For best result use only this portion of disc
Cross Sanding - When finishing a surface that
has been prepared by a coarse disc or wheel, sand
at right angles to the strokes made by the coarser
disc. Finishing marks left from previous sanding are
easily seen and removed for a uniform finish. Failure
to cross sand when changing from a coarse disc to
a finishing disc may result in deep scratches and
circular marks.
Hold at a 5° to 15° angle
Removing Welds or Hammer Marks - When remov-
ing welds or hammer marks, limit coarse sanding to
the immediate area. Use successively finer grits to
smooth surface.
Finishing Metal - Constantly move across the sur-
face. Work faster on curved surfaces where contact
areas are smaller and pressure is greater. Flat areas
may appear at the end of the stroke when pressure
is too heavy. Ease up on pressure at end of each
stroke and when reversing strokes.
Troubleshooting
Deep scratches and circular marks can result from:
• Using too coarse a grit
• Using a partially glazed disc
• Dirt or loose metal on the workpiece
• Failure to sand across the grain when changing from
coarse to finishing discs
• Failure to use closed coated discs to reduce the
problem of grains working loose and scratching
the workpiece
Bluish discoloration of metal surface indicates:
• Excessive heat caused by circular motion in a small area
• Excessive pressure
• Use of worn out or glazed discs
MAINTENANCE
To reduce the risk of injury, always
WARNING
unplug the charger and remove the
battery pack from the charger or tool before
performing any maintenance. Never disassemble
the battery pack, charger, or tool, except as pro-
vided in these instructions. Contact a MILWAUKEE
service facility for all other repairs.
Maintaining Tool
Keep this tool, battery pack and charger in good
repair by adopting a regular maintenance program.
Inspect the tool for issues such as undue noise,
misalignment or binding of moving parts, breakage
of parts, or any other condition that may affect the
tool operation. Return the tool, battery pack, and
charger to a MILWAUKEE service facility for repair.
Depending on use, periodically have an authorized
service facility inspect and maintain the tool, battery,
and charger to ensure proper performance.
If the tool does not start or operate at full power with
a fully charged battery pack, clean the contacts on
the battery pack. If the tool still does not work prop-
erly, return the tool, charger and battery pack, to a
MILWAUKEE service facility for repairs.
Internal Coin Cell Battery
Chemical Burn Hazard.
WARNING
This device contains a
lithium button/coin cell battery. A new
or used battery can cause severe in-
ternal burns and lead to death in as
little as 2 hours if swallowed or enters the body.
Always secure the battery cover. If it does not
close securely, stop using the device, remove the
batteries, and keep it away from children. If bat-
teries may have been swallowed or entered the
body, seek immediate medical attention.
An internal coin cell battery is used to facilitate full
ONE-KEY™ functionality.
To replace the coin cell battery:
1. WARNING! Remove tool's battery to avoid start-
ing the tool.
2. Loosen the screw(s) and open the coin cell bat-
tery door.
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