Milwaukee 1670-1 - Manual (Page 8)

page 8
Bracing for reverse rotation
When drilling in reverse, the bit will rotate in a counterclockwise direc-
tion. 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.
Figures 6 and 7 show examples of the Hole Hawg
® properly braced for
reverse rotation.
A. Reverse (counterclockwise) rotation
B. Reaction
C. Brace drill with pipe handle here
D. Brace drill with motor housing here
If the bit binds, the pipe handle or the motor housing braced against the
stud will hold the drill in position.
Shifting Speeds (Fig. 8)
Cat. No. 1675-1 has a gear shift lever on the right
side of the gear case.
The high setting (1200 RPM HI) is the low torque
setting and is designed for driving Selfeed bits
1-3/8" in diameter and smaller.
The low setting (300 RPM LO) is the high torque
setting and is designed for driving Selfeed bits
1-1/2" in diameter and larger.
Always turn off the switch and shift while the
tool is coasting to a stop. Never shift the drill while
it is moving at full speed, when it is under load, or
when it is stopped.
Reversing (Fig. 9)
A reversing switch is located below 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, a flick of
the trigger switch will free the threaded pilot screw. When the threads
are loose, lift the bit from the workpiece with the motor stopped.
Drilling
Before drilling, clamp down the material securely. A poorly secured piece
of material may result in personal injury or inaccurate drilling. When
drilling in light gauge metal or wood, use a wooden block to back up the
material to prevent damage to the workpiece.
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.
To start a selfeed bit, run the threaded feed screw into the work by
flicking the trigger switch, permitting the bit to coast until the teeth con-
tact the work surface. Align the bit properly before proceeding. This will
reduce cocking and jamming when starting. To reduce jamming on break-
through, decrease the drilling pressure when the feed screw point breaks
through the workpiece. Proceed with steady, even pressure.
B
A
C
D
A
B
Fig. 6
Fig. 7
Fig. 9
Fig. 8
Chuck Removal (Fig. 7)
This tool is equipped with a threaded spindle to hold the chuck. Before
removing the chuck, unplug the tool and open the chuck jaws. A left-
handed thread screw is located inside the chuck to prevent the chuck
from loosening when the tool is operated in reverse direction. Remove
the screw by turning it clockwise. To remove the chuck, hold the tool so
that only the side of the chuck rests firmly and squarely on a solid
workbench. Insert the chuck key or a chuck remover bar in one of the
keyholes. Turn the chuck so the key is at about a 30° angle to the bench
WARNING!
To reduce the risk of injury, always wear eye protection.
Fig. 7
top and strike the key
sharply with a hammer so the
chuck turns in a counter-
clockwise direction (looking
from the front of the tool).
This should loosen the chuck
from the spindle which has
a right hand thread making it
easy to remove the chuck by
hand.
NOTE: When replacing the
chuck, always replace the
left hand thread screw in the
chuck.