Diamond Products UDM - Manual (Page 17)

• Wear gloves and be alert to
the surrounding environment
when handling core bits.
1. Select the correct core bit size and type for the
drilling task.
2. Raise the spindle shaft to provide room to
install the core bit.
3. For smaller core bits: Holding the bit with both
hands, screw the hub onto the spindle shaft
until it bottoms out on the shaft. Make sure the
bit is secure (the bit will tighten further once it
enters the concrete).
4. For larger core bits:
a) Place the bit under the spindle shaft and
align the bit and hub with the shaft threads.
b) Start the engine.
c) Set the Drill Rpm cartridge to the slowest
rotating speed.
d) Set the Cylinder Speed knob to a very slow
speed.
e) Press the Drill Down button to slowly lower
the spindle shaft until the threads are
engaged with the hub. CAUTION: Proper
hub and spindle shaft alignment is critical to
avoid cross threading when installing the
core bit. Stop immediately and readjust the
bit if the shaft and hub are not aligned when
installing the bit. When aligned, the shaft will
screw itself into the hub and lift the bit off
the ground. If required, apply light
resistance to the bit to prevent spinning,
which will allow the shaft to screw itself
completely into the bit.
f) Turn off the Drill Rpm cartridge.
5. Raise the core bit to provide clearance
between the bit and the ground.
Removing a Core Bit
Move all body parts away from
the core bit when releasing the bit
from the spindle shaft.
1. Lower the core bit to be very close to the
ground.
2. Grasp the flats near the top of the spindle using
the wrench provided. Hold the wrench in
place to stabilize the spindle shaft and use
another appropriate tool to grasp the core bit
hub.
3. Turn the tool clockwise to loosen the core bit.
Remove smaller bits by hand when the bit is
near the end of the threads. Continue
removing larger bits using the tool; the bit will
release and fall to the ground. Note: Keeping
the bit close to the ground or dropping it onto
stable pieces of wood will help prevent
segment damage when the bit releases.
4. When the bit is near the end of the threads,
a. Remove smaller bits by hand,
b. Allow larger buts to release and fall
to the ground. Keep bit close to the
ground to minimize impact and help
prevent segment damages.
Dropping the bit onto would or other
soft surfaces will reduce impact.
• Excessive drilling speeds or lowering to quickly of
bit at first contact with the
concrete surface can cause bit
breakage, resulting in serious
injuries and/or death.
• Turn off all electricity, gas, and
water around the work area prior to drilling.
• Use extreme caution when
drilling through floors. Another
trained worker must clear the
surrounding area on the lower
floor prior to drilling in case the
core falls to the lower floor.
Helpful Hints Prior to Drilling
Keep the following in mind for better efficiency
while drilling:
• Avoid drilling excessively deep to preserve the
core bit and reduce costs.
• For proper vacuum suction, make sure the
drilling surface is clean and solid (no cracks,
dents, etc.). Wetting the surface can help when
vacuum sealing.
• Use a proper water flow to prevent damaged
and stuck bits. Using too much water when
drilling will make the slurry look clear. Not using
enough water will make the slurry look thick and
pasty.
Tasks Prior to Drilling
Complete the following tasks prior to drilling:
• Raise the core bit to provide clearance
between the bit and the ground when
maneuvering the machine.
• Clearly mark the drilling area.
• Be sure the work area does not contain any
buried or embedded electrical, gas, or water
lines.
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