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Polishing Metal and Concrete
Do not use angle grinder for
polishing painted surfaces
or plastics. Using angle grinders for such ap-
plications may damage materials and surfaces .
Angle grinders may be used for some polishing
operations such as creating smooth surfaces
on metal, concrete, or stone . Polishing these
materials requires certain skill and involves se-
lection of proper accessories and grinder set-
ting . All polishing operations begin with grind-
ing to remove imperfections such as welds or
burrs on metal, leveling uneven concrete areas,
or making cuts in stone such as marble . Next
step is to remove tool markings using backing
pad with proper grit sanding disc, or polishing
stones mounted on a Type 27 fiber/epoxy back-
ing wheel, like a flap wheel having typical grit
between 200-600 .
To create final smooth finish, a fine sanding disc
or polishing stone having 1600 grit should be
used . For best polishing results, grinder with
variable speed is recommended and the speed
should be set to approximately 4000 RPM . If
available, felt wheel for angle grinders and pol-
ishing compound may also be used . When using
a grinder without the variable speed adjustment,
surface being worked on should be monitored
carefully to avoid overheating due to friction .
Wire Brush (Wheels and Cups)
Wire brushes are intended to "clean" structural
steel, castings, sheet metal, stone, and con-
crete . They are used to remove rust, scale, and
paint .
1 . Allow the tool to reach full speed before
touching the tool to the work surface .
2 . Apply minimum pressure to the work sur-
face, allowing the tool to operate at high
speed .
3 . Continuously move the tool at a moderate
speed to avoid creating gouges in the work
surface .
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page heading
Operation
4 . Remove the tool from work surface before
turning tool off . Allow the tool to stop rotat-
ing before laying it down .
Tip: The tips of the brush do the work . Operate
wire brushes with the lightest pressure so only
the tips of the wire come in contact with the
work piece . If heavier pressures are used, the
wires will be overstressed, resulting in a wiping
action and a shortened brush life due to wire
fatigue . Applying the side or edge of the brush
to the work piece will result in wire breakage
and shortened brush life .
CORRECT:
Wire tips
doing
the work .
INCORRECT:
Excessive
pressure can
cause wire
breakage .
CORRECT:
Wire tips
doing
the work .
INCORRECT:
Excessive
pressure can
cause wire
breakage .
WIRE WHEEL BRUSH
WIRE CUP BRUSH
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4/17/2024 10:53:36 AM
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