Brief Description: Rivet wing main ribs to main spar.
Time to rivet the wing ribs to the main spar. This is a mile stone in that it will be the first time I have riveted the -4 (larger) rivets using a rivet gun and bucking bar. It's a violent process. Most logs talk about using two people to rivet these rivets. One on the gun and one on the bar. Also, a few logs I've seen show the wing laying flat on a study table for this bucking process. I did it different. I put the wing in the wing jig with the ribs on the top. I did it solo with the gun on top against the manufactured head and the bar on the bottem making the shop head. The second and third pictures shows me bucking a rivet. I actually didn't do it this way. Instead of looking at the gun while riveting, I bent over and looked at the bucking bar side. You see, the gun is on top of the 270 rivet and is not going anywhere. The bucking bar however will move. Watching the bucking bar gives you an oportunity to adjust the bar position and angle while the rivet is being bucked.
I used 60PSI for these. Took about a second to buck.
Had 2 bad rivets on each spar that had to be drilled and re bucked.