Milwaukee 4004 Manuel De L'utilisateur page 9

Using the Optional Telescoping Assembly
1. Secure the rig using either an expansion-type anchor or a vacuum
system (see "Securing the Equipment to the Work Surface").
2. Place the top fl ange of the extension against a ceiling or wall and
place the other end on the jack screw at the top of the Dymorig
column.
The assembly is adjustable up to 14 feet. Turn the jack screw to tighten
the assembly and to make small adjustments.
Supply an Adequate Water Flow
An adequate supply of water must fl ow freely and constantly during the
entire cut. Dymodrills are equipped with a built-in water shut-off valve to
allow water to fl ow down the inside and up around the outside of the bit.
This acts to cool the bit and fl ush cuttings from the hole.
Reading the Meter Box (Fig. 16)
Fig. 16
20 Amp Operat-
ing Range
15 Amp Operat-
ing Range
The ammeter is the dial indicator on the meter box, which is standard
®
equipment with the Vac-U-Rig
Dymorigs. The ammeter provides pressure feedback during coring, allowing
you to help prevent motor overload and premature bit wear. The green area
on the ammeter is the operating range and the red area indicates that you
are applying too much pressure.
To reduce the risk of injury, always use Dymodrills in
conjunction with meter boxes. Meter Boxes provide
a switch to turn the Dymodrill motor OFF and ON
and an optimum operation range to help prevent
motor overload.
and can be purchased separately for other
WARNING!
Shear Pin and Clutch (Fig. 17)
Fig. 17
Shear Pin
Dymodrill Nos. 4079, 4090, and 4094 contain a shear pin to protect the gear
and motor against overload. This pin drives the spindle sleeve. If the bit binds,
the pin will shear to prevent gear and motor damage. Extra shear pins are
supplied with each Dymodrill and can be replaced (see "Accessories" for
part numbers). It is important to check the condition of the spindle before
using the tool each 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).
Cat. Nos. 4004, 4005, 4092, 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 adjustment. Nuisance (frequent) clutch slippage should
be addressed by an authorized MILWAUKEE service center.
To reduce the risk of injury, always check the work
area for hidden wires before coring.
Coring Procedure (Fig. 18)
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 accord-
ing 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
Spindle Sleeve
(Shear pin models)
Threaded Spindle
(Clutch Models)
Retaining Ring
(shear pin model only)
WARNING!
Gear
Shift
Lever
Water
Shut-Off
Valve
page 9