Milwaukee 4253-1 Manuel De L'utilisateur page 5

OPERATION
Line Lockout
The line lockout prevents the drill motor from
starting when line power is fi rst 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 fl ash and the drill motor will stop.
When the magnet light fl ashes, 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 accomplished 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 fi rst having to bring the
motor to a full stop. Ideal for tapping.
Soft-Start
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 selec-
tions, 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 thin-
ner stock, a backup plate must be used. The
magnetic base WILL NOT hold on non-mag-
netic 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 suffi cient
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 com-
ing loose.
Surface Preparation
Paint, rust, scale or uneven surfaces de-
crease 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, fl at
fi le 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 ev-
ery pound applied to the handle, you create
ten pounds on the drill point, thereby elimi-
nating operator fatigue. Even large bits only
require a small amount of pressure on the
handle. Example: 20 Pounds on the handle
creates 200 Pounds on the drill point.
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WARNING
To reduce the risk of injury, always
use a safety chain when drilling
overhead or on a vertical surface.
Safety Chain
Fig. 5
C-clamp
A safety chain is standard equipment with
every unit. Should a power loss occur, the
mounting could come loose.
When mounting the tool to a vertical surface,
the safety chain must be used to secure the
tool to the surface.
1. To mount the tool to a vertical surface,
place the magnetic drill press on the
prepared surface. Push the magnet
button on to activate the magnet.
2. Route the safety chain through the
lower carrying handle and wrap it tightly
around a solid, rigid structure as shown
(Fig. 5).
3. Eliminate any slack in the chain. Hook
the safety chain together using the
snaphook provided.
4. Secure the safety chain with a c-clamp
or similar device. This will hold the chain
in place and prevent the tool from sliding
down the vertical surface.
WARNING
To reduce the risk of injury, wear
safety goggles or glasses with side
shields. Unplug the tool before
changing accessories or making
adjustments.
Control Panel
Fig. 6
A
D, E
A - Drill Rotation Speed - Fast/Slow
Adjusting the dial changes the drill rotation
speed electronically. The higher numbers on
the dial produce faster rotation.
B - Forward Drill Button
C - Reverse Drill Button
The drill may be set to two positions: forward
and reverse.
1. For forward (clockwise) rotation, push
the green forward button. Check the
direction of rotation before use.
2. For reverse (counterclockwise) rotation,
push the yellow reverse button. Check
direction of rotation before use.
D - Magnet Button - On/Off
The magnet button must be activated before
the drill will run.
1. To turn the magnet on, push the "Mag-
net" button. The red indicator light will
turn on.
2. To turn the magnet off, push the "Mag-
net" button. The red indicator light will
turn off.
E - Drill and Magnet Interlock
The drill will not operate unless the magnet
button is pushed and the red indicator light
is on. If the operator attempts to start the drill
before turning on the magnet, the drill buttons
will not function.
9
B
C