100-412-196 REV. 06 71
Lapping Procedure
5. Holding the part to recondition, place the interface surface on the emery cloth. Grasp the part at
the lower end, with your thumb over the spanner-wrench hole, and lap the part in a straight line
across the emery cloth
6. Rotate the part 120 degrees (1/3) to the next hole
7. Stroke the part an equal number of times at each rotation (2 or 3)
8. Pick up the part and lap it once or twice in the same direction
9. Rotate the part 120 degrees, placing your thumb over the spanner-wrench hole, and lap the part
the same number of times as described above
10.Rotate the part another 120 degrees to the next spanner-wrench hole, and repeat the lapping
procedure
Re-examine the mating surface. If necessary, repeat steps 5 through 10 until you remove
most of the contaminant. This should not require more than two to three complete
rotations for an aluminum horn or booster; a titanium component may require more
rotations.
7.2.2 Horn Tip Cleaning
Take the following steps to clean the horn’s tip threads:
1. If the horn has a replaceable tip, remove it and clean its threads in alcohol
2. Swab out the end of the horn threads with a cotton swab and alcohol
3. Make sure both the horn and the tip are clean and completely dry before you reassemble them
Refer to the Tip installation procedures for information on tightening the Tips. This is
found in 5.3.2 Connecting Tips, Horns, and Converters
4. Use a spanner wrench on the horn and an open-end wrench on the tip to install the tip using the
following torque specifications
1/4-20 — tighten at 90-inch-lbs/10.16 Newton-meters
3/8-24 — tighten at 180 inch-lbs/20.33 Newton-meters
7.2.3 Stud Reinsertion
The Stud is intended to be a use-only-once part, as it has knurls on its end which ‘bite’
into the relatively softer horn material. The studs are also specially designed to withstand
ultrasonic stresses. Studs can only be re-used with aluminum horns. If you must re-use a
stud from an aluminum horn, follow the following procedure:
1. Clean the threads and the horn of the previous shavings
2. Using a file card or wire brush, clean any chips from the knurled end of the stud
3. Using a clean cloth or towel, clean the threaded hole
4. Examine the knurled end of the stud. If worn, replace the stud. Examine the stud and threaded
hole for stripped threads. Do not use a damaged ultrasonic horn or converter
NOTICE
Do not apply downward pressure. The weight of the part alone provides sufficient
pressure.
NOTICE
Threaded studs cannot be re-used in titanium horns.
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