mill2978
Well Known Member
While I was riveting ribs to rear spar on my RV8 wings and 5 AN470AD4-8 factory heads failed in the same way.
I was hand bucking these with a double offset cup and a tungsten bucking bar. I was using ~45PSI and the shop head was well formed. I had an assistant who was holding the rivet gun perpendicular to the work so I could focus on squeezing the trigger and forming the shop head. When we lifted the rivet gun the factory head just fell out of the cup. leaving the rest of the rivet in place.
Any ideas how this happens? Was this technique or could I have other rivets that are ready to fail in a similar way? I inspected(including some light prying on the rest with no failures) and don't see any indication of problems.
I was hand bucking these with a double offset cup and a tungsten bucking bar. I was using ~45PSI and the shop head was well formed. I had an assistant who was holding the rivet gun perpendicular to the work so I could focus on squeezing the trigger and forming the shop head. When we lifted the rivet gun the factory head just fell out of the cup. leaving the rest of the rivet in place.
Any ideas how this happens? Was this technique or could I have other rivets that are ready to fail in a similar way? I inspected(including some light prying on the rest with no failures) and don't see any indication of problems.