Milwaukee 4004 Manuel De L'utilisateur page 10

time. The spindle must be smooth without grooves
or pitting. If the spindle is not in good condition, it
is possible for the threaded spindle sleeve and the
internal spindle to weld together and seize during
coring (see "Lubricating the Spindle for Dymodrills
with a Shear Pin" in the "Maintenance" section for
spindle lubricating instructions).
Fig. 17
Shear Pin
Spindle Sleeve
(Shear pin models)
Threaded Spindle
(Clutch Models)
Retaining Ring
(shear pin model only)
Cat. Nos. 4004, 4005, 4096 and 4097 feature a
friction clutch rather than a shear pin to protect the
motor and gears. If the motor overloads, the clutch
will begin to slip and the bit will stop rotating. The
clutch is factory-set and does not require adjust-
ment. Nuisance (frequent) clutch slippage should
be addressed by an authorized MILWAUKEE
service center.
WARNING
always check the work area for hidden wires
before coring.
Coring Procedure
1. Select and install a bit following guidelines in
"Selecting and Installing a Core Bit".
2. Secure the rig to the work surface using one of
the methods described in "Methods for Securing
Equipment to Work Surface".
3. With the motor OFF, adjust the gear to either
high or low speed according to the guidelines in
"Selecting Speeds".
NOTE: DO NOT SHIFT SPEEDS WHEN THE
DYMODRILL MOTOR IS ON. To adjust the
speed on all Dymodrills, move the gear shift lever
to the desired setting.
Fig. 18
4. Connect the water hose to the Dymodrill water
shut-off valve and to the water supply. Make
sure the seal is watertight. Use a standard
garden hose if you require additional length.
Set up a water collection system.
To reduce the risk of injury,
Gear Shift
Lever
Water Shut-Off
Valve
5. If you are using a vacuum system, read the
instructions for specifi c setup in "Assembling
& Using a Vacuum System".
Do not continue the following steps until the
vacuum gauge reads at least 20 inches of
mercury vacuum. Never operate the Dymodrill
if the gauge reads less than 20 inches (see
"Mothods for Securing Equipment to Work
Surface"). Always monitor the vacuum gauge
during coring. If water collects in the vacuum
pump fi lter jar, empty it to prevent damage to
the pump.
WARNING
do not operate the Dymorig if the gauge reads
less than 20 inches of mercury vacuum.
6. Turn the Dymodrill motor ON. Turn the water
on so it fl ows freely through the water shut-off
valve (see "Supply an Adequate Water Flow").
Turn the valve clockwise to increase water fl ow
and counterclockwise to decrease water fl ow.
7. While holding the handle, slightly loosen the
cradle lock handle and slowly rotate the handle to
lower the bit into the workpiece, applying steady,
even pressure. To help reduce bit wandering,
always use a light load to start the hole and wait
for the tip of the bit to penetrate the work surface
completely before increasing the load.
8. Use suffi cient pressure so the bit cuts constantly.
Use the ammeter on the meter box as a guide
for proper pressure.
NOTE: If the rig shifts during coring, stop the
motor, reposition the rig and resume coring.
9. Monitor the water fl ow (see "Diamond Coring").
Generally, water should fl ow at a rate of ap-
proximately one to two gallons per minute. If
the water fl ow is too heavy, the two holes in the
water swivel housing will leak. If that happens,
reduce water fl ow. Water fl ow is adequate when
the water and cuttings are fl ushed in a circular
pattern about 1/2" around the bit. Keep the work
area dry.
10.When the cut is complete, keep the drill motor
ON and rotate the handle clockwise to remove
the bit. The bit may become stuck in the hole if
you turn the motor OFF before the bit is com-
pletely removed. Once the bit is removed from
the work surface, turn the motor OFF. Tighten the
cradle lock handle. Unplug the meter box from
the power supply before removing the vacuum
pump to prevent accidental starting of the motor
when the vacuum pump is released.
If you are using a vacuum pump, unplug it and
open the vacuum release valve to release the
vacuum.
Retrieving Cores and Deep Coring
When coring holes that are longer than the core bit,
follow the steps below.
1. Begin coring the hole as usual. When you have
cored to the length of the bit, stop the Dymodrill
motor.
2. Remove the core by driving a chisel or slender
wedge into the cut between the core and the work
surface. You may also use a special core tongs,
bent wire or anchor bolts to remove the core.
10
To reduce the risk of injury,