TM 9-243
USING THE PORTABLE ELECTRIC DRILL
WARNING
BEFORE USING ANY ELECTRICAL
TOOL, ALWAYS MAKE CERTAIN THE
TOOL IS EQUIPPED WITH PROPER
GROUNDING FEATURES. FAILURE TO
HAVE PROPER GROUNDING CAN
RESULT IN SERIOUS SHOCK.
WARNING
ALWAYS WEAR PROPER EYE PRO-
TECTION WHEN WORKING WHERE
FLYING PARTICLES MAY CAUSE EYE
INJURY.
1
Select the proper bit (1) required for the task.
NOTE
To turn chuck key in either direction a firm
grasp of the chuck is required.
2
Fit the chuck key (2) into the side adjusting hole
between jaws (3) and chuck (4) and turn the key
counterclockwise until the chuck opens enough to
admit the bit shank (5).
3
Insert the bit and center the shank in the chuck
jaws. Tighten jaws securely by turning the chuck
key clockwise.
4
Remove chuck key and store where key will not
get lost.
5
Before drilling, make sure that the work is station-
ary or firmly secured.
6
Using a punch or awl, make a small prick point (6)
in the spot where the hole will be made. (This will
prevent the drill bit from bouncing or slipping away
from the spot where the hole is to be drilled.)
7
Connect electric drill (7) to power source. Place
the drill bit on the marked spot and depress trigger
switch. Begin drilling, exerting firm but even pres-
sure to keep the bit cutting.
8
Withdraw the bit frequently from the work to clean
chips from the bit flutes (8) and to allow the bit to
cool.
9
Ease upon the drill pressure as the bit approaches
the other side of the work surface.
10 After hole is completed, carefully withdraw rotating
drill bit to prevent binding or breaking. Release
trigger switch.
52-5
