Milwaukee 6140 Manuel De L'utilisateur page 6

Grinding
WARNING
A Type "27" guard must be installed
when using a grinding wheel to
provide maximum protection for the
operator if the wheel should break.
Selecting Wheels
Grinding is the cutting action of thousands
of abrasive grains on the face of a grinding
wheel. When grinding metals such as steel
and iron, choose an aluminum oxide grinding
wheel. Select a silicon carbide grinding wheel
for stone and concrete. Use cotton reinforced
wheels for non-ferrous metals.
Type 27 reinforced 1/8" cut-off wheels are
suited for small cut-off and shallow notching
operations only.
Installing Grinding Wheels
Fig. 5
t
Flange nu
Boss
Spindle
Grinding
wheel
Flange
Flange nut position for 1/4" thick wheels
Fig. 6
Flange nut
Boss
Spindle
Grinding
wheel
Flange
Flange nut position for 1/8" thick or less wheels
1. When guard is properly positioned,
place fl ange on spindle with fl ange fac-
ing away from tool.
WARNING
To reduce the risk of injury, do not
use the spindle lock button to stop
the spindle while the tool is in use
or is coasting after shut-off. This will
result in tool damage.
2. Place selected wheel on spindle and
align with fl ange. Position fl ange nut
according to wheel thickness as shown
(Fig. 5 & 6).
3. Press the spindle lock button while turn-
ing fl ange nut clockwise. Tighten securely
with the spanner wrench provided.
4. To remove wheel, unplug tool and re-
verse procedure.
Grinding
Fig. 7
Operator's Zones
1. Depending on your job, position the
guard to provide maximum protection
for the operator (Fig. 7).
2. If you have just installed a grinding wheel
or are just beginning a period of work,
test wheel by letting it spin for one min-
ute before applying it to the workpiece.
NOTE: Out-of-balance wheels can mar
workpiece, damage the tool, and cause
stress to wheel that may cause wheel
failure.
3. Firmly grasp body of tool and side
handle before starting and while using
tool. Allow wheel to come to full speed
before starting to grind.
Fig. 8
Hold at a 5° to 15° angle
4. When grinding, hold sander/grinder
at a 5 o to 15 o angle as shown, us-
ing constant pressure for a uniform
finish. Too great an angle causes
concentrated pressure on small areas
which may gouge or burn work surface.
5. Control pressure and surface contact
between disc and workpiece. Too much
pressure slows cutting speed.
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Using Cut-Off Wheels
Type "1" cut-off wheels are suited for small cut-
off and shallow notching operations only.
WARNING
A Type "1" guard must be installed
when using a cut-off wheel to pro-
vide maximum protection for the
operator if the wheel should break.
1. Firmly grasp body of tool and side
handle before starting and while using
tool. Allow wheel to come to full speed
before starting.
2. When using a cut-off wheel, hold sander/
grinder as shown, using only the edge
of the wheel.
3. Control pressure and surface contact
between disc and workpiece. Too much
pressure slows cutting speed.
Fig. 9
WARNING
Using the face of a cut-off wheel (as
in grinding) will cause the wheel to
crack and break, resulting in serious
personal injury.
WARNING
Everyone in the area must wear pro-
tective clothing and safety goggles
or face shields. Fatigued wires and
residue will fl y off the brush with con-
siderable force, causing the potential
for serious injuries.
Installing Wire Cup Brushes
1. Unplug tool and place it upside down on
a level surface as shown. Remove any
accessories from spindle.
Fig. 10
Wire cup brush
2. To install, thread wire cup brush onto
spindle. Press the spindle lock button
while tightening brush with a 7/8" open
end wrench (not provided with tool).
3. To remove wire cup brush, unplug tool
and reverse procedure.
WARNING
Because the wires on wire wheel
brushes are directed towards the
operator, a guard must be used to
protect the operator when fatigued
wires break.
Using Wire Wheel Brushes
Wire wheel brushes are useful for removing
rust, scale, burrs, weld slag, etc. A wide va-
riety of wire brushes are available for many
applications.
Test wire wheel brush for balance and loose
or damaged wires by running tool at no load
speed for at least one minute before apply-
ing it to your work. During this time, no one
should stand in front of or in line with it. When
applying brush to work, avoid using too much
pressure. This causes over-bending of wires
and heat build-up resulting in premature wire
breakage, rapid dulling and reduced brush
life. Instead of using more pressure, try a wire
wheel brush with more aggressive cutting
action (increased wire size, decreased wire
length or different brush type, i.e., knot type
instead of crimped wire type).
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