Diamond Products UDM - Manual (Page 18)

Drilling a Hole
Reminder: Always refer to the Drill Mode section in
Operating the U to set the cylinder pressure and drill
motor pressure prior to drilling.
1. Position the machine and core bit.
2. Move the function switch to Drill.
3. Lower the front mast and rear legs. All tires
should just clear the ground and the front and
rear tire height should match up so the machine
is level.
4. Turn on the Vacuum switch and close the
vacuum valve. Check the vacuum gauge for
pressure; stop to determine the problem when
suction fails. Skip this step if the vacuum cannot
be used when drilling.
5. If the machine is equipped with a 2-speed drill
motor, set the motor to High for bits up to 10”
and Lo for bits larger than 10”.
6. Adjust the Drill Rpm cartridge based on the bit
size. Refer to the core drilling speeds chart on
the machine for the recommended core bit
speeds when drilling. DO NOT exceed the
maximum recommended drilling speed.
7. Turn on the Water switch.
8. Turn on the water valve and adjust the water
flow valve to increase or decrease the water
flow. Note: Always have a proper water
pressure and flow when drilling for maximum
core bit efficiency. DO NOT continue drilling
when a problem arises with the water system.
9. Push the Drill Down button and SLOWLY lower
the bit to start the hole. Once ground contact is
made continue drilling to the desired depth, or
release the Drill Down button and turn the Auto
Drill switch to On/Drill (the bit will lower until the
cylinder fully extends or until Auto Drill is turned
off) to drill to the desired depth. DO NOT use
Auto Drill until after the bit has contacted the
surface to prevent serious injuries or damage to
the machine.
10. Release the Drill Down button or turn off the
Auto Drill switch.
11. Press the Drill Up button to raise the bit out of the
hole. Note: Pressing the Turbo and Drill Up
buttons together will raise the bit quickly.
12. Turn off the Drill Rpm cartridge.
13. Decrease the water flow and turn off the water
valve and Water switch.
14. If used, turn off the Vacuum switch and open
the vacuum valve to release suction.
15. Lower all tires to the ground. Note: Make sure
the mast and rear legs are fully lifted for
maximum ground clearance.
16. Move the function switch to Start/Drive.
Continuing a Partial-Hole
1. Inspect the drill hole and remove, if possible,
items that may cause the bit to stick (lost core
bit segments, broken concrete).
2. Align the bit with the previous hole and slowly
lower the bit back into the hole. DO NOT drill
unless the core bit is aligned with the hole.
3. Finish drilling the hole following the directions
directly above.
Stuck Cores
Removing a Stuck Core
4. Remove the core bit from the machine.
5. Move the bit away from the work area.
6. Lay the bit on the ground. DO NOT hammer on
the core bit to avoid denting the tube, which
can result in additional problems and increased
hang-ups.
7. Option 1:
a) Place a metal spike through the hub and
drive the core out of the bit.
b) Inspect the bit for damages and clean or
replace as necessary.
8. Option 2:
a) Thread a piece of threaded rod (1-1/4-7)
through the hub until it contacts the
concrete.
b) Place two hex nuts on the rod end and lock
them against each other.
c) Holding the bit in place, grasp both nuts
using a wrench and turn to push the rod
against the concrete, which will drive the
core out of the bit.
d) Inspect the bit for damages and clean or
replace as necessary.
DO NOT hammer or pry on the bit! This will dent the
tube, which can result in additional problems and
increase hang-ups.
Stuck Bits
Stuck core bits happen most frequently in the
following circumstances:
• An insufficient water supply allows slurry to
accumulate, causing the drill to seize.
• Pushing the drill down too hard can cause
the machine’s frame to shift slightly (more
susceptible when not using the vacuum).
• Drilling completely through a slab may
cause segments to catch at the bottom
edge of the hole when raising the bit.
• Partially cutting through a piece of rebar
with just the outer edge of the bit (mooning)
can deflect the bit, causing it to jam. Slowly
cutting through rebar or hard spots may help.
15