![]() In some instances, a combination of the two may be used in other words, the top sheet of an assembly may be dimpled while the under sheet is machine countersunk. The two methods used to countersink flush rivets are dimple and machine countersinking. Flush rivets are made with heads of several different angles, but the 100-degree rivet is standard for all Navy aircraft. If considerable skill is not used, the metal will be damaged by the rivet set. Another hazard is the closeness of the rivet set to the metal during riveting. Flush rivets are more difficult to install because the parts being riveted must be countersunk. It is essential to provide an aerodynamically smooth surface. In fabricating stressed metal skin, all exposed rivet heads must be countersunk to lie flush with the outer surface of the skin. Flush Riveting In aircraft construction, manufacturers are eliminating protruding-head rivets on the exterior surfaces. All burrs must be removed by using a larger size drill or by using a deburring tool. The center punch mark should be large enough to prevent the drill from slipping out of position, but must not be made with enough force to dent the surrounding material. Therefore, the pneumatic drill should be used. The hazard is caused by the arcing of the brushes. Electric drills constitute a fire hazard when you are drilling on or near an aircraft. Locations for the rivet holes should be center punched and the drilling done with a power drill, either electric or pneumatic. This prevents binding of the rivet in the hole. Note that there is a slight clearance in each case. Table 13-2 specifies the size drill to be used with the various size rivets. Drilling Rivet Holes Standard twist drills are used to drill rivet holes.
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