Figure 13-3.—Rivet sets. Bucking Bars

 Bucking bars are tools used to form bucktails (the head  formed  during  riveting  operations)  on  rivets. They  come  in  many  different  shapes  and  sizes,  as shown  in  figure  13-4. Bucking  bars  are  normally made  from  an  alloy  steel  similar  to  tool  steel.  The particular shape to be used depends upon the location and accessibility of the rivet to be driven. The size

and weight of the bar depend on the size and alloy of the rivet to be driven. Under certain circumstances, and  for  specific  rivet  installations,  specially  designed bucking  bars  are  manufactured  locally.  These  bars are  normally  made  from  tool  steel.  The  portion  of  the bar designed to come in contact with the rivet has a polished finish. This  helps  to  prevent  marring  of formed  bucktails.  Bucking-bar  faces  must  be  kept smooth and perfectly flat and the edges and corners rounded.

NOTE:  Never hold a bucking bar in a vise unless  the  vise  jaws  are  equipped  with protective  covers  to  prevent  marring  of  the bucking bar. A satisfactory rivet installation depends largely on the condition of the bucking bar and your ability to use it. If  possible,  hold  the  bucking  bar  in  such  a manner that will allow the longest portion of the bar to be in line with the rivet. You should hold the bucking bar lightly but firmly against the end of the rivet shank so as not to unseat the rivet head. The inertia of this tool provides the force that bucks (upsets) the rivet and forms a flat, headlike bucktail.

Hole Finder A hole finder is a tool used to transfer existing holes in aircraft structures or skin to replacement skin or patches. See figure 13-5. The tool has two leaves parallel to each other and fastened together at one end. The bottom leaf of the hole finder has a teat installed near the end of the leaf that is aligned with a bushing on the top leaf. The desired hole to be transferred is located by fitting the teat on the bottom leaf of the hole finder into the existing rivet hole. The hole in the new part is made by drilling through the bushing on the  top  leaf.  If  the  hole  finder  is  properly  made,  holes drilled  in  this  manner  will  be  perfectly  aligned.  A separate  duplicator  must  be  provided  for  each diameter of rivet to be used.

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