Milwaukee 5268-21 Manuel De L'utilisateur page 4

WARNING
Applying greater pressure
does not increase the tool's effectiveness. If the
applied working pressure is too high, the shock
absorber will be pushed together making the
vibrations to the handle noticeably stronger.
Operator Force
The Anti-Vibration System provides the operator
with comfort without sacrifi cing power or perfor-
mance.
Ideal operator force compresses the bellows slightly
and allows the tool to work aggressively while the
handle remains steady.
Excessive force compresses the bellows signifi -
cantly and reduces vibration dampening. Users will
be able to feel the difference and should adjust the
force to the handle accordingly.
Too Little Correct Too much
force force force
Using the Control Switch
Always allow the motor to come to a complete stop
before using the control switch to avoid damage
to the tool.
For forward (clockwise) rotation, push in the control
switch from the right side of the tool. Check the
direction of rotation before use.
For reverse (counterclockwise) rotation, push in the
control switch from the left side of the tool. Check
direction of rotation before use.
Operating
Position the tool, grasp the handles fi rmly and pull
the trigger. Always hold the tool securely using
both handles to maintain control. This tool has
been designed to achieve top performance with
only moderate pressure. Let the tool do the work.
If the speed begins to drop off when drilling large
or deep holes, pull the bit partially out of the hole
while the tool is running to help clear dust. Do not
use water to settle the dust since it will clog the bit
fl utes and tend to make the bit bind in the hole. If
the bit should bind, a built-in, non-adjustable slip
clutch prevents the bit from turning. If this occurs,
stop the tool, free the bit and begin again.
Cold Starting
If this tool is stored for a long period of time or
at cold temperatures, it may not hammer ini-
tially because the lubrication has become stiff.
To warm up the tool:
1. Insert and lock a bit or chisel into the tool.
2. Pull the trigger and apply force to the bit or chisel
against a concrete or wood surface for a few
seconds. Release the trigger
3. Repeat until the tool starts hammering. The cold-
er the tool is, the longer it will take to warm up.
Using Rotary Percussion Core Bits
Core Bits are useful for drilling large or long holes
in concrete. MILWAUKEE Heavy-Duty Core Bits
have heat-treated steel bodies with durable carbide
tips. These core bits are specially designed for
fast, accurate drilling with combined hammering
and rotary action.
1. Clean and lubricate the threads on the adapter
and core bit to make later removal easier. Thread
the adapter shank to the rear of the core bit.
2. Push the guide plate
onto the pointed end
of the center pin. In-
sert the center pin and
guide plate assembly
into the core bit. Be
sure the small end of
the center pin is se-
curely placed into the
hole in the center of the
core bit.
F o r L H S s y s t e m s ,
screw the threaded
end of the centering bit
into the core bit.
NOTE: If using an
extension, fi rst thread
the adapter shank to
the extension. Then
thread the core bit to
the extension.
3. Insert the adapter into
the nose of the tool as
described in "Installing
Bits and Chisels". Set
the knob to the "ham-
mering with rotation"
setting.
4. Press the centering
bit fi rmly against your
center mark, hold the
tool fi rmly and pull the
trigger.
NOTE: If the 48-20-
5099 threaded stud is
used, or a center pin
and guide plate are
not available, use a
template or notched
board to start the hole.
5. Start the tool. After drilling to about the depth
of the core bit teeth, remove the center pin and
guide plate from the core bit (not necesary for
LHS system). Resume drilling.
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6. To change the core bit, hold the tool upwards,
pointing it away from your body, and run it briefl y
in forward to loosen the core bit from the adapter.
NOTE: To make deeper holes, remove the core bit,
break and remove the core, then resume drilling.
When drilling long or deep holes, after each inch
of penetration pull the bit partially out of the hole
while the tool is running, to help clear dust from the
bit fl utes. Dust can clog the bit fl utes and can make
the bit bind in the hole. If this occurs, stop the tool,
free the bit and begin again.
Drilling Large Diameter Holes with Core Bits
When drilling holes with large diameter core bits,
dust may build up in the cut and can cause the tool
to stall, bind, or cut slowly. By creating an opening
for the dust to escape, drilling time, bit stress, and
tool stress can be reduced.
1. Start the cut as normal.
2. Once the bit is fi rmly estab-
lished in the cut (about 1/4"
Cut
deep), remove the bit from the
approximately
cut.
1/4" deep with
3. Remove the bit from the tool.
a core bit.
4. Install a standard fluted bit,
approximately 7/8" in diameter,
onto the tool.
5. Drill a perpendicular hole
through the kerf of the large
Drill a hole
hole.
through the
• Depending on the location of
work.
the work, the hole should either
break through the other side of
the hole/fl oor or extend 4"-5"
past the end of the workpiece
(such as into the dirt below a
concrete slab).
Top view
• If dust builds up in the hole,
vacuum it out and continue
drilling.
• If drilling through a wall, the
hole for dust should be drilled
Dust and debris
on the lowest part of the large will fall through
the hole.
hole kerf as the dust will fall
there when drilling and can
be evacuated more easily.
6. Reinstall the core bit and
continue drilling. Dust and
debris will fall through the
Side view
hole and optimize the cut-
of slab
ting ability of the bit.
NOTE: If unable to drill a hole
in the kerf, pull back on the
bit with the hammer running.
This will remove some of the
dust and debris from the cut.
Repeat this for every inch of Pull bit out as far
as possible once
drilling. If necessary, vacuum
or twice per inch
dust and debris from the cut
drilled.
and surrounding area.
7. For core bits, once
the maximum core
bit depth is drilled,
the core must be
b r o k e n a n d r e -
moved.
• Install a chisel bit.
• Place the chisel into
the hole kerf.
• Chisel down into
the kerf at several
points until the core is loose or broken.
• Remove the core and vacuum/remove any
remaining dust and debris.
• Install the core bit and continue the cut.
Chiseling and Chipping
MILWAUKEE Rotary Hammers may be used for
chipping and chiseling.
When chiseling, hold the tool at an angle to the
workpiece. Work from a corner or close to the edge
of the workpiece, breaking off one small area at a
time rather than attempting too large an area.
A variety of accessories are available.
Bushing Tools
Used to surface concrete.
Mortar Cutting Chisels
(Seam Tools)
For removing old mortar for tuck
pointing or caulking.
Bull Points
For demolition work and starting
holes in concrete slabs.
Flat Chisels
For edging, chipping or channeling.
Scaling Chisels
For removing weld spatter or scale
and cutting straight lines.
Slotting Chisel
For slotting and cutting between
drilled holes in concrete and masonry.
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