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09-17-2013, 07:18 PM
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Join Date: Oct 2011
Location: Liberty Twp, OH
Posts: 641
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Inboard rear spar wing skin rivets
A question a week from me. I'm on a roll.
This past weekend, my dad, a family friend, and I were riveting the inboard wing skins. All was well, until I got to the inboard rear spar rivets, where the doubler fork and plate is already riveted to the spar with universal-head rivets. The thickness of the doublers and rivet heads was enough to interfere with trying to set the skin-to-spar rivets.
I'm still drilling out other rivets. But these ones worry me the most about how to set them. You can see how they literally were half-set. One I tried back-riveting, the other I tried with my squeezer. I'm not even sure my tungsten bar would be thin enough to fit between the unset tail and the edge of the doubler plate if I were to try flush riveting.
How'd the rest of you do these?

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Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO
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09-17-2013, 07:34 PM
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Join Date: Aug 2006
Location: Secluded Lake,Alaska (AK49)
Posts: 359
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Gun and bar
I used a gun and bar with one face cut at about a 30 degree angle.
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09-17-2013, 07:38 PM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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I ran into the same thing on my -7. I used an old wood chisel. I laid the wing on the work bench with some carpet under it to prevent scratches. Then I slid the trailing edge about 6" off the edge of the carpet and used Styrofoam blocks to raise the leading edge so the trailing edge was flat against the carpet - and my back riveting plate. I laid the chisel down against the rivet shanks and used it as a flat set. I hit it with the rivet gun with a real flat set. It worked fine, I didn't even have to drill out the ones that had the shanks half-smashed like yours, they set pretty nice and flat.
Hope this helps. I couldn't even wedge the angled face of my tungsten bar under there to get the last half dozen or so, but the chisel worked like a charm.
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Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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09-17-2013, 07:48 PM
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Join Date: Oct 2011
Location: Liberty Twp, OH
Posts: 641
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Hrm. I like that idea Dale. Dad's an ex-woodshop teacher, so plenty of old dull chisels sitting around.  I'll have him bring some for this weekend's work session. The rest of the rear spar rivets I'm going to squeeze once my 4" yoke comes in from Avery later this week.
Thanks!
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Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO
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09-17-2013, 07:51 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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Yup - wood chisel would probably work, I used a big flat blade screwdriver with the tungsten bucking bar behind it, and the gun on the factory head.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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09-18-2013, 08:47 AM
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Join Date: Aug 2009
Location: La Grande, Oregon
Posts: 32
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I used this...
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Ranger Craig
RV-9A N214DX
Flying since 7/26/13
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09-18-2013, 09:07 AM
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Join Date: Jul 2011
Location: Port Townsend, Washington
Posts: 77
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Used 4 inch yoke which has a thin side, with a pneumatic squeezer. I don't remember any particular problem.
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John O
RV9a N709RV
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09-18-2013, 09:11 AM
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Join Date: Jan 2009
Location: Beautiful downtown Winnemucca
Posts: 87
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make a tool
A lot of the building fun is making/modifying tools. I believe I used a no-hole yoke in my squeezer. I ground (grinded?) the top and sides of the yoke so it would fit in the space available.
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Flying Maule MXT-7-180
Building RV-9
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09-18-2013, 09:16 AM
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Join Date: Mar 2007
Location: 45G, Brighton, MI
Posts: 1,867
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Tungsten bucking bar with a 15-degree face. Best $125 I've spent so far. 
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Miles (VAF# 1238, Paid up as of 2018)
RV-7 TU 904KM (reserved)
Wings Fitted and Finish Kit on site
Construction Log
Picasa: Empennage Album, Wings Album, Fuselage Album
1955 Cessna 170B flying since 1982
'To get something you never had, you have to do something you never did.' -Unk.
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09-18-2013, 11:59 AM
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Join Date: Jan 2006
Location: Ehprata, WA
Posts: 318
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4 inch no hole yoke, "adjusted" the tip with the bench grinder to fit.
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Nate Benson
Ephrata, WA
RV9A/Slider N608MA
Flying
KitProject.com
"If you think you can do a thing, or think you can't do a thing, you're right." -- Henry Ford
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