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PFolbrecht(at)starkinvest
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 Posted: Mon Oct 02, 2006 6:44 am Post subject: What do with with a bad three-layer joint... |
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It turns out that match-drilling the trim-tab hinge (on both sides) was easy and the whole thing went very well. The gap is uniform and perfect and all the joints are great… except for one. I wasn’t able to effectively clamp on the outboard-most hole on the tab and didn’t get a tight joint. So, I drilled out that rivet and redid it, clamping as best I could – and now it’s worse. It’s pretty darn ugly, with gaps between the skin/spar AND spar/hinge, both around 1/64” probably.
I’m sure this happened due to the slight enlarging of the hole from the drill-out although I did a perfect job on that.
I think the best thing to do here would be enlarge to 1/8” to use the larger rivet, but there’s no way to dimple/countersink for the larger size, of course.
If I just drill it out and try again there’s almost no way it will turn out better and will probably be worse. What’s the thing to do here?? Pre-squeezed rivet? This joint uses -4s and I don’t have anything longer, although I’m sure they’re made and I could get some.
Thanks,
Paul
9A QB #1176
Nearing end of empennage
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khorton01(at)rogers.com
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| Posted: Mon Oct 02, 2006 8:39 am Post subject: What do with with a bad three-layer joint... |
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On 2 Oct 2006, at 10:43, Folbrecht, Paul wrote:
| Quote: |
It turns out that match-drilling the trim-tab hinge (on both sides) was easy and the whole thing went very well. The gap is uniform and perfect and all the joints are great… except for one. I wasn’t able to effectively clamp on the outboard-most hole on the tab and didn’t get a tight joint. So, I drilled out that rivet and redid it, clamping as best I could – and now it’s worse. It’s pretty darn ugly, with gaps between the skin/spar AND spar/hinge, both around 1/64” probably.
I’m sure this happened due to the slight enlarging of the hole from the drill-out although I did a perfect job on that.
I think the best thing to do here would be enlarge to 1/8” to use the larger rivet, but there’s no way to dimple/countersink for the larger size, of course.
If I just drill it out and try again there’s almost no way it will turn out better and will probably be worse. What’s the thing to do here?? Pre-squeezed rivet? This joint uses -4s and I don’t have anything longer, although I’m sure they’re made and I could get some.
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This may be good place to use a NAS1097 rivet, commonly called an "Oops rivet". The 1/8" size has a head that is the same size as a 3/32 rivet, so you could drill out the hole to 1/8", but not have to dimple/countersink. And, as you know now, be sure to find a way to clamp the joint tight before riveting. You have to get very creative sometimes, but you are risking a bad rivet if you things aren't clamped tightly together.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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