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Diamond Core Bits
The following conditions can greatly influence dia-
mond core performance:
• Amount of water
• RPM of core drill motor
• Bit run out
• Amount of steel
• Size of embedded steel
• Age of concrete
• Aggregate (size, type, hardness, abrasiveness)
• Type of sand–manufactured vs. river (natural)
• Operator technique
• Operator care
• Feed pressure applied to bit by operator
• Core Drill Stand rigidity and condition
To extend core bit life:
• Choose the right bit for the job. Take into account
the size, aggregate, sand, etc.
• When using a new bit, use light feed pressure for
the first 2 or 3 holes, so the new diamond gradually
breaks in.
• Feed bits very slowly onto the work surface. Use light
feed pressure until the bit crown has penetrated or
"seated" into the material.
• If the core bit encounters embedded steel, slow
down the feed pressure and let the bit core at its
own pace. Don't force the bit. Typically, the water
around the bit will clear when embedded steel is
encountered.
• Minimize all vibration. Slow the feed rate when
necessary. Vibration will cause severe diamond
breakage or pullout.
• Use sharp bits.
To reduce the risk of injury, when
WARNING
working in dusty situations, wear
appropriate respiratory protection or use an
OSHA compliant dust extraction solution.
When drilling with water, route the water away
from the work area or use a liquid collection de-
vice to keep work area dry and reduce the risk of
electrical shock. Do not allow water to flow inside
machine or battery pack.
Water Supply
Water provides several benefits during coring:
• Water acts as a coolant, eliminating the heat caused
by the friction of the coring action. This preserves
the integrity of the diamonds, the bond matrix, the
segment solder, and core tube. Without a coolant,
the heat buildup during coring can cause all of these
components to fail.
• Water flushes loose, abrasive particles created
during coring. These particles consist of aggregate,
sand, diamond particles and various metals from
embedded steel and the core bit matrix. The hole
must be free of debris to allow the core bit to work.
If loose particles are not properly flushed from the
hole, an unnecessary drag will occur along the side
of the core barrel. This can contribute to bit glazing
through lack of power as well as motor damage
through amperage increases due to bit resistance.
In addition, loose particles tend to wear the bit tube,
which can eventually result in the loss of segments.
• Water keeps dust down and makes for a cleaner,
healthier workplace. WARNING! Always use an
OSHA compliant dust extraction solution.
To prevent visible dust, an adequate supply of water
must flow freely and constantly during the entire cut.
A built-in water system allows water to flow down the
inside and up around the outside of the bit.
WARNING! When drilling with water, route the water
away from the work area or use a liquid collection
device to keep work area dry and reduce the risk of
electrical shock.
1. Use clean water at less than 90 psi through the
garden hose when operating.
2. Fasten a standard 5/8" quick-connect fitting to
the end of a 5/8" garden hose, and connect the
hose to the drill.
3. Do not use hoses that are distorted, worn or
damaged.
4. Use the water valve to turn the water supply on
and off when coring.
Clutch Servicing
The MX FUEL™ Core Rig has a mechanical clutch;
it is usual to hear sounds and feel vibrations from the
Drill. If the clutch activates regularly during normal op-
eration within the green load lights "Ideal Pressure",
the clutch needs to be serviced. Return the Drill to
the nearest authorized MILWAUKEE service center.
NOTE: AVOID activating the clutch for more than 10
seconds at a time. The clutch being active for long
periods of time could cause damage to the clutch,
and drill resulting in a loss of performance.
Selecting Gears
Select the gear according to the bit diameter and
base material. Only change gears when the machine
is stopped. Press in the button on the side of the
gear selector, and then turn the gear selector until
it latches completely into the appropriate gear for
the application.
GEAR SPECIFICATIONS
Gear Setting
1
2
3
4
Arming the Machine
The MX FUEL™ machines must be armed prior to
use. Even with the battery pack inserted, the trig-
ger and machine functions will not operate until the
machine is armed.
To arm the machine:
1. Insert the battery pack.
2. Press the Arm button. The MX FUEL™ icon will
light. The spindle switch will become armed in 2
seconds.
3. After 15 minutes of inactivity, the machine will enter
sleep mode. The MX FUEL™ icon will go off and
the Spindle Rotation ON/OFF switch and LEDs
are unoperational.
4. Press and hold the Arm button for 1 second to
reactivate the machine.
5. Press and hold the ARM button for 1 second to
unarm (turn off) the machine. The MX FUEL™
icon will go off.
7
Rated No
Core Bit Size
Load RPM
6" - 14"
3" - 6"
2" - 3"
1/2" - 2"
390
850
1650
2200
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