![]() Apply sealing compound (appendix C, item 61) to hole and surrounding area. Care must be taken to assure that no chips are between sheets of metal. Remove all burrs with a metal countersink or file. ![]() Avoid letting drill wobble, making oblong holes. NOTE l While drilling, hold drill at 90 angle to material surface. This will help assure that drill does not jump out of position when motor is started. Sans a drill, remove the rivet’s head and drive it through the surface using a hammer and chisel. If drilling can’t penetrate a difficult rivet, grind off the head and bore through it. Use a drill bit to push tiny rivets through the surface. When using a power drill, give the bit a few turns with fingers before starting motor. 3/16 (5mm) 3/16 (5mm) 3/16 (5mm) for Heavy-duty jobs. Place drill bit in center mark for new rivet locations, or align drill bit with old hole when replacing old rivets with oversize rivets. 10 drill bit is used to install standard 3/16-in. Our rivet removal tool comes complete with four threaded drill bits and guides for removing 3/32' (40), 1/8' (30), 5/32' (21) and 3/16' (12) universal head (AN470) solid rivets. Make sure drill bit is the correct size (tables 33-1 and 33-2) and point is properly ground. Rivets are cleanly removed without damage to the rivet hole or aircraft skin. lb prevent denting, place a bucking bar behind material during punching. ![]() Center punch mark must be large enough to prevent drill bit from slipping out of position, yet it must not dent the surface of the material. ![]()
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