Milwaukee Tool 1680-21 - Manual (Page 4)

6 7
WARNING To reduce the risk of injury,
wear safety goggles or glasses with side
shields.
OPERATION
Clutch
The Super Hawg
™ has a clutch that is active when
the tool is running in low speed only. The clutch
disengages the bit from the geartrain to protect
the tool. When a high load is encountered, the
clutch will slip and a ratcheting sound will be heard.
Release the trigger switch when the clutch begins
to slip (see "Bit Binding"). Continuous use of the
tool when the clutch is slipping will reduce the life
of the mechanism.
Bit binding
If the bit binds, the drill will suddenly react in the
opposite direction of the rotation of the bit. Figure
3 shows the path of reaction, (B) if the drill bit
binds while being driven in forward (A). Reduce
the chances of a sudden reaction by following the
instructions listed below. Prepare for a sudden
reaction by holding or bracing securely.
To reduce the chance of bit binding:
• Use sharp bits. Sharp bits are less likely to bind
when drilling.
• Use the proper bit for the job. There are many
types of bits designed for specifi c purposes.
• Use the proper speed for the size bit. Larger bits
should be run at the lower speed (see "Speci-
fi cations"). Driving larger bits at high speeds
will increase the chance of the bit binding and
increase the chance of reaction.
Fig. 3
B
A
Fig. 4
B
C
A
Fig. 5
B
A
D
Bracing for reverse rotation
Reversing
A reversing switch is located opposite the trigger
switch for removal of bits from holes. Permit the
motor to come to a complete stop before reversing.
Reversing the tool with the gears in motion may
cause severe damage. When removing selfeed bits
from partially drilled holes, fl ick the trigger switch
when the tool is in reverse to free the threaded pilot
screw. When the threads are loose, lift the bit from
the workpiece with the motor stopped.
When drilling in reverse, the bit will rotate in a
counterclockwise direction. If the bit binds in the
hole, the bit will come to a sudden stop and the
drill will suddenly react in a clockwise direction.
There are two ways to properly brace the Super
Hawg
™ for reverse rotation (Fig. 6 & 7).
A. Reverse (counterclockwise) rotation
B. Reaction
C.
Brace drill with side handle here
D. Brace drill with motor gearcase here
If the bit binds, the side handle or the gearcase
braced against the stud will hold the drill in position.
Shifting Speeds
A
B
D
Fig. 7
B
C
A
Fig. 6
Fig. 8
WARNING To reduce the risk of injury
and damage to the tool, shift speeds only
when the drill is at a stop. The shift knob is
located near the chuck and should not be
shifted while the chuck is moving.
1. Before drilling, be sure the workpiece is clamped
securely. A poorly secured piece of material may
result in personal injury or inaccurate drilling.
Use backing material to prevent damage to the
workpiece during breakthrough. When drilling in
light gauge metal or wood, use a wooden block
to back up the material to prevent damage to the
workpiece.
2. When starting a hole, place the drill bit on the
work surface and apply fi rm pressure.
To start a selfeed bit, run the threaded feed
screw into the work by fl icking the trigger switch,
permitting the bit to coast until the teeth contact
the work surface. Align the bit properly before
proceeding. This will reduce cocking and jam-
ming when starting.
When drilling in metal, mark the center of the hole
to be drilled with a center punch to give the bit a
start and to prevent it from "walking." Lubricate
the drill bit with cutting oil when drilling iron or
steel. Use a coolant when drilling nonferrous
metals such as copper, brass or aluminum.
WARNING To reduce the risk of injury,
keep hands and cord away from the bit and
all moving parts.
WARNING To reduce the risk of explo-
sion, electric shock and property damage,
always check the work area for hidden pipes
and wires before drilling.
• Keep selfeed bits aligned with the work surface
so bits go in straight (see "Drilling").
• Avoid drilling warped, wet, knotty, and/or pitchy
material if possible.
• Avoid drilling in material that you suspect contains
hidden nails or other things that may cause the
bit to bind.
The direction of reaction is always opposite of the
direction of bit rotation. Reaction is even more likely
to occur when enlarging already existing holes and
at the point when the bit breaks through the other
side of the material.
If the bit does bind:
1. Release the trigger immediately.
2. Reverse the motor.
3. Remove the bit from the work and start again.
4. Do not pull the trigger on and off to attempt to
start a stalled bit. This will damage the drill.
Bracing for forward rotation
When drilling in forward, the bit will rotate in a
clockwise direction. If the bit binds in the hole, the
bit will come to a sudden stop and drill will suddenly
react in a counterclockwise direction.
There are two ways to properly brace the Super
Hawg
™ for forward rotation (Fig. 4 & 5).
A. Forward (clockwise) rotation
B. Reaction
C.
Brace drill with side handle here
D. Brace drill with gearcase here
If the bit binds, the side handle or the gearcase
braced against the stud will hold the drill in position.
WARNING To reduce the risk of per-
sonal injury when drilling, hold the tool by isu-
lated gripping surfaces when performing an
operation where the cutting tool may contact
hidden wiring or its own cord. Contact with a
"live" wire will make exposed metal parts of
the tool "live" and shock the operator
WARNING To reduce the risk of injury,
hold or brace securely. Always be prepared
for bit binding and drill reaction.
Starting, Stopping and Controlling Speed
1. To start the tool, pull trigger switch.
2. To stop the tool, release the trigger switch.
Drilling
Use the shift knob to select High or Low speed
(Fig. 8). High speed (1750 RPM) is the low torque
setting. Low speed (450 RPM) is the high torque
setting. See the "Specifi cations" section for bit
capacity limits under high and low speeds.
Always turn off the switch and shift speeds while
the tool is stopped. Never shift the drill while it is
moving or when it is under load.
NOTE: The clutch is active in low speed only.