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Rivet Removal
Self-plugging rivet (mechanical lock) pull tool

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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shank may be punched out with a drift punch. See figure 13-48. The removal of flush rivets requires slightly more skill. If the formed head on the interior is accessible and has been formed over heavy material, such as an extruded member, the formed head can be drilled through and sheared off. If the material is thin, it may be necessary to drill completely through the shank of the rivet, and then cut the formed head with diagonal-cutting pliers. The remainder of the rivet may then be drifted out from the inside. BLIND RIVET INSTALLATION The description and use of blind rivets are covered in chapter 2 of this manual. The special tools and installation and removal methods are covered in the following sections. Selection of the proper equipment depends on a number of variables: space available for equipment, type of rivets to be driven, and the availability of air pressure. Installation Tools One of the tools used for driving buck rivets is the CP350 blind rivet pull tool. See figure 13-49. The nose of the tool includes a set of chuck jaws that fit the pull grooves in the rivet pinto pull it through the rivet shank to drive the rivet. The nose also has an outer anvil that bears against the outer part of the manufactured head during the driving operation. The third nose component is an inner anvil that advances automatically to drive the locking collar home after the blind head is formed. A short nose assembly, interchangeable with the standard assembly, is available for use in areas of restricted clearance. A change in rivet diameter requires a change in chuck jaws, outer anvil, inner anvil, and inner anvil thrust bearing, and an adjustment of the shift valve operating pressure. A change in the rivet head type from universal head to countersunk head without a change in rivet diameter, or vice versa, requires only a change of the outer anvil. A special chuck jaw assembly tool is furnished with the tool. To insert the chuck jaws into the chuck sleeve, you should mount the three jaws on this assembly tool to form a cone. Then lower the inverted chuck sleeve over the jaws. You should always be sure that the pull tool is equipped with the correct size chuck jaws, the outer and inner anvils fit the rivets being driven, and the relief valve operating Figure 13-48.—Removal of rivets. 13-30







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