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11. Turn on the vacuum pump, and place the vacuum port and gauge over punctures in the vacuum bag. An ex- tra layer of breather fabric under the port will help to in- sure that epoxy is not drawn into the vacuum line. As the air is removed from the bag, listen for leaks around the bag perimeter, especially at folds in the bag, laps in the mastic and at the exhaust tube or port con- nection. Where leaks are found, push the bag into the sealant or, if necessary, plug the leaks with pieces of mas- tic or tape. 13. After the laminate has cured, remove the mold from the bag and peel the breather, release fabric and perfo- rated film from the laminate. Separate the laminate from the mold by inserting small wooden or plastic wedges be- tween the edge of the laminate and the mold. Insert addi- tional wedges along one side of the part, extending the separation around the part until it pops loose. 12. Place the gauge away from the exhaust tube or port connection. Monitor the vacuum pressure and check for leaks throughout the cure. Allow the epoxy to cure thor- oughly before turning off the vacuum. If you plan to reuse the vacuum bag, mark the port and gauge locations with a felt marker so the holes can be easily found and sealed. 14. Remove the finished right half of the rudder from the mold. Trim the laminate to the centerline of the rudder and grind down any high spots in the center of the rud- der. Laminate the left half in the same way. Sand the bonding surface of the two halves and bond the halves together with thickened epoxy. Drill the hole for the pivot pin and seal the exposed core inside the hole with epoxy. Fair the bond line around the edges of the rudder and sand the outer surface to prepare it for paint. Vacuum Bagging Applications 24 4PDF Image | Vacuum Bagging Techniques 002150
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