Fluxing

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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NOTE If during the grit blast operation the gun becomes clogged, it maybe necessary to sift foreign matter from the grit. This is accomplished by using a sieve furnished with the grit blasting cabinet. 6. Repeat the process until the entire exposed area of wire rope has been grit blasted. Finally, direct the nozzle into the open end of the broomed-out wires at about 30° from the longitudinal, and rotate the wire rope slowly through 360° while blasting with a circular motion. See figure 3-52. Remove the wire rope from the cabinet and inspect it for completeness of grit blasting. Any evidence of shine will indicate a need for additional grit blasting. CAUTION After being grit blasted, the wires should not be touched with hands, rags, gloves, and so on, or the cleanliness required for sound terminals will be impaired. 7. Shake the wire rope vigorously, broomed-out end down, to remove any grit between the wires or in the hemp center. Figure 3-52.—Blasting inner wires. CAUTION Only air from the cabinet supply is used to remove grit; do NOT use any other source, because other sources may be contaminated with oil or water. 8. Remove the grit-siphon tube from the grit supply, and air blast the wire rope to remove the remaining grit. NOTE After grit blasting a total of 15 broomed-out ends, drain off 10 pounds of used grit from the bottom of the hopper and replace it with 10 pounds of new grit. 9. Remove the tape from the wire rope. 10. Prepare a Fluxing For solution solution and flux the wire rope. preparation and fluxing, the following procedures are used: 1. Heat the pre-mixed solution until the temperature is between 160 and 210°F, using the hotplate provided. Measure the temperature of the solution with the bimetallic thermometer. Allow the solution to remain at this temperature for 5 minutes, then remove it from the hotplate and allow it to cool to room temperature. 2. Remove any scum or foreign matter from the surface of the cooled solution with clean napkins or wiping towels. Do NOT agitate the solution during this operation. 3. Carefully pour the clear, cooled solution into another stainless steel container. Avoid pouring any foreign matter into this container. NOTE If the hot-air drying method is used, the solution can be used cold. If the cable is to be dried by natural air, use the procedures listed in step 4. 4. Heat the clear flux solution until the temperature is between 160 and 210°F. 3-55

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