TM 9-243
USING THE PORTABLE ELECTRIC DRILL - CONTINUED
USING THE COUNTERSINK
The following is the procedure for using the
countersink:
1.
Always
wear
safety
glasses
when
using
countersinks
2.
Select the desired countersink cutter according to
point angle and pilot size.
3.
Attach countersink unit to a drill motor.
4.
Adjust the micrometer stop to the desired depth.
This will be slightly more than the thickness of the
head. Measurements for head thickness for most
screws available at the site are in the Coded Parts
List.
5.
Be sure the unit is secured properly to the drill chuck
before turning on the power.
6.
Hold the countersink guard in the left hand and the
drill motor In the right hand. Never turn on the
power without holding the countersink guard.
7.
When possible, countersink a test hole in scrap
stock to insure that the dimensions are correct.
8.
Countersink the hole approximately halfway, then
remove the tool and check the hole.
9.
Countersink the remainder of the hole until the guard
collar rests on the metal.
10. Examine the finished job to insure the hole is round
and even and that the screw fits properly.
MICROMETER STOP COUNTERSINK
P/N 3204375 - Countersink Tool
P/N 3204386 - Complete Kit
COUNTERSINK CUTTERS
Point Angle
Pilot Diameter
P/N 3204376
82
.098 in
P/N 3204377
82
.128 in
P/N 3204378
82
.159 in
P/N 3204379
82
3/16 in
P/N 3204380
82
1/4 in
P/N 3204381
100
.098 in
P/N 3204382
100
.128 in
P/N 3204383
100
.159 in
P/N 3204384
100
3/16 in
P/N 3204385
100
1/4 in
52-5.2/ (52-5.3 blank) Change 3
