Milwaukee K 750 S Operator's Manual page 6

Using Rotary Percussion Core Bits
Core Bits are useful for drilling large or long holes in
concrete. MILWAUKEE
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 adaptor
and core bit to make
later removal easier.
Thread the adaptor
shank to the rear of the
core bit.
Push the guide plate
2.
onto the pointed end of
the centre pin. Insert
the centre pin and
guide plate assembly
into the core bit. Be
sure the small end of
the centre pin
securely placed into
the hole in the centre of
the core bit. For LHS
systems, screw the threaded end of the centring
bit into the core bit.
NOTE: If using an extension, first thread the
adaptor shank to the extension. Then thread the
core bit to the extension.
3. Insert the adaptor into
the nose of the tool as
described in "Installing
Bits and Chisels". Set
the knob to
"hammering
rotation" setting.
4. Press the centring bit
firmly against
centre mark, hold the
tool firmly and pull the
trigger.
Start the tool. After
5.
drilling to about the
depth of the core bit
teeth, remove
centre pin and guide
plate from the core bit
(not necesary for LHS
system). Resume
drilling.
6. To change the core bit, hold the tool upwards,
pointing it away from your body, and run it briefly
in forward to loosen the core bit from the adaptor.
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 25 mm (1") of penetration pull the bit
partially out of the hole while the tool is running,
to help clear dust from the bit flutes. Dust can
clog the bit flutes and can make the bit bind in
the hole. If this occurs, stop the tool, free the bit
and begin again.
®
Heavy-Duty Core Bits
is
the
with
your
the
Drilling Large Diameter Holes
with Core Bits
When drilling ho les with
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 firmly established in
the cut (about 6.35 mm (1/4")
deep), remove the bit from the cut.
3. Remove the bit from the tool.
4.
Install a standard
approximately 22.2 mm (7/8") in
diameter, onto the tool.
5.
Drill a perpendicular hole through
the kerf of the large hole.
Depending on the location of the
•
work, the hole should either break
through the other side of the hole/
floor or extend 101.6 mm - 127 mm
(4"-5") past the
workpiece (such as into the dirt
below a concrete slab).
•
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 on the lowest part of the large hole kerf as
the dust will fall there when drilling and can be
easily removed.
6. Reinstall the core bit and con-
tinue drilling. Dust and debris
will fall through the hole and
optimise the cutting 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 25 mm (1") of drilling. If
necessary, vacuum dust and
debris from the
surrounding area.
7. For core bits, once the maximum
core bit depth is drilled, the core
must be broken and removed.
• 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 remain-
ing dust and debris.
• Install the core bit and continue the cut.
To reduce the risk of personal in-
WARNING
jury and damage to the tool or work:
Always use the "hammering only" setting to
•
set the anchor. Never use the "hammering
with rotation" setting to set the anchor.
Never switch the tool to "hammering with
•
rotation" until after the anchor has been set
and the tooth anchor chuck has been
removed from the anchor.
6
large di ameter core bits,
Cut
approximately
6.35 mm (1/4")
deep with a
core bit.
fluted bit,
Drill a hole
through the
work.
Top view
end of the
Dust and debris
will fall through
the hole.
Side view
of slab
Pull bit out as far
as possible once
or twice per mm
(inch) drilled.
cut and