TM 10-7360-209-13&P5-3.RIVET REPLACEMENTa.Procedure.(1) Check for evidence of loose or working rivets.NOTEA working rivet. has movement under structural stress,but has not loosened so much that you can see movement.This condition can sometimes be detected by a dark, greasyresidue or damage to paint and primers around rivet heads.(2) Where possible, replace rivets with the same type as originallyused.(a) The rivet code designation gives the type of rivet, thematerial, the diameter in 32nds of an inch, and the length in 16ths of an inch.(b) The determination of the length of a rivet is an importantpart of any repair.The length used depends on the grip or combined thicknessof material to be riveted plus a minimum allowance of 1/2 diameter for upsettingthe shank.(c) Always use the nearest standard rivet length greater thanthe calculated sum.(3) There are specific considerations in laying out the rivet patternfor a repair; these rules will apply generally in all instances.(a)When possible, rivet edge distance, rivet spacing, anddistance between rows should be the same as that of the original installation.(b) When new sections are to be added, the edge distancemeasured from the center of the rivet should never be less than two times thediameter of the shank.The distance between rivets or pitch should be at leastthree times the diameter; the distance between rows should never be less than1/2 times the diameter.(c) Mark the rivet pattern on the metal with a soft pencil toavoid scratching.(4) Rivet holes may be drilled with either a light power drill or ahand drill (standard shank twist drill).(a) Before drilling, center-punch all rivet locations. Thecenter-punch mark should be large enough to prevent the drill from slipping outof position.5-2
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