Milwaukee 4262-1 - Manual (Page 7)

page 7
Control Panel (Fig. 6)
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 turn-
ing 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 op-
erator 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.
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.
Drill Rotation Speed - Fast/Slow (Fig. 6A)
Adjusting the dial changes the drill rotation speed electronically. The higher
numbers on the dial produce faster rotation.
Drill Buttons - Forward/Reverse (Fig. 6B, C)
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 but-
ton. Check direction of rotation before use.
To reduce the risk of injury, always use a safety chain when
drilling overhead or on a vertical surface.
WARNING!
OPERATION
Safety Chain (Fig. 5)
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 autho-
rized 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 first hav-
ing 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 selections, at a given speed dial setting, without the constant change
seen with standard speed controls.
Fig. 6
A
B
C D, E
C-clamp
Fig. 5