USING THE COUNTERSINK

TM-9-243 Use and Care of Selected Hand Tools and Measuring Tools Manual
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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

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