Milwaukee 4253-1 Manuel De L'utilisateur page 5

1. Select the mounting area that
best suits your application.
2. Line up the mounting holes.
3. Slip the lock washers over
the mounting screw and
insert them through the
back of the slide and into
the motor mounting pad.
Tighten securely.
Adjusting the Gib Assembly
To adjust the gib, loosen or
tighten the gib adjustment
set screws on the side of
the support housing ac-
cordingly with the 3/32" hex
key provided. Tightening
the set screws increases
friction on the slide. The gib
should be set tight enough
to support the weight of the
drill in any position. All
adjusting screws should be
set to provide smooth and
even travel over the entire
length of slide movement.
The set screws contain a
nylon patch that prevents them from moving freely.
Additional adjustment of the gib may be required from
time to time with extended use of the tool.
Connecting the Power Cord
Control Panel Socket
Insert the drill plug into the control panel socket
and screw it on tightly. Plug the drill press into the
nearest power source. This drill press is rated for
120 volts AC, 60 Hz.
OPERATION
To reduce the risk of injury, always
WARNING
wear proper eye protection marked
to comply with ANSI Z87.1.
Line Lockout
The line lockout prevents the drill motor from starting
when line power is first applied to the system or after
a momentary power loss.
Motor/Magnet Interlock
The motor/magnet interlock is a feature that prevents
power from being applied to the drill motor if the
magnet is not energized. The motor magnet interlock
also prevents the magnet from being de-energized
while the motor is running.
Diagnostic Light
Low current reduces the magnet's holding power.
When current is low, the detection light will flash
and the drill motor will stop. When the magnet light
flashes, check for the following:
• Low voltage at the plug
• Loose motor connection
• Mag panel buttons are jammed or stuck
If the detection light continues to flash, take the entire
unit to an authorized service center.
Auto Base/Chip De-Mag
(Motor must be OFF)
The metal chips formed while drilling have a tendency
to retain some residual magnetism and stick to the
base once the electromagnet is de-energized. In
order to prevent this, a base/chip de-mag is accom-
plished after the motor has stopped by pushing the
magnet button. The indicator light will turn off and
the base will automatically de-mag.
Electronic Switching
The drill motor may be switched from forward to
reverse without first having to bring the motor to a
full stop. Ideal for tapping.
Soft-start is incorporated into the system to help
increase drill motor life and decrease stress on the
overall system. This feature increases the drill motor
speed up from zero to the maximum speed set by
the dial in less than one (1) second.
Feedback/Speed Control
The electronic speed control system allows the user
to obtain repeatable speed selections, at a given
speed dial setting, without the constant change seen
with standard speed controls.
Magnetic Holding Force
The electromagnetic drill press attaches magnetically
to any ferrous metal. It is designed for use on 1/2"
or thicker ferrous stock. Holding power will decrease
on thinner stock, a backup plate must be used. The
magnetic base WILL NOT hold on non-magnetic
grades of stainless steel.
Backing Plate
A backing plate must be used when the workpiece
is less than 1/2" thick because the electromagnet
cannot provide sufficient holding force on thickness'
less than 1/2". The backing plate must bring the
combined thickness of the workpiece and backing
plate to at least 1/2". Make sure the backing plate is
larger than the magnet footprint. Clamp the backing
plate underneath the workpiece, directly below the
magnet, before turning the magnet on.
The workpiece must be able to support the mag
stand's weight without bending. A bent workpiece
reduces the magnet's contact area which can result
in the magnet coming loose.
Surface Preparation
Paint, rust, scale or uneven surfaces decrease the
holding strength of the magnet. Chips, burrs, dirt
and other foreign materials on the surface of the
magnetic base will also decrease holding power. Use
a smooth, flat file to keep the magnet clean and free
of nicks. Clean the surface before attaching the drill
stand to the material.
Rack and Pinion
These units have a 10:1 feed ratio: i.e. for every
pound applied to the handle, you create ten pounds
on the drill point, thereby eliminating operator fatigue.
Even large bits only require a small amount of pres-
sure on the handle. Example: 20 Pounds on the
handle creates 200 Pounds on the drill point.
5
Soft-Start