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  #1  
Old 08-06-2022, 04:41 PM
TTaylor TTaylor is offline
 
Join Date: Oct 2021
Location: Marysville, WA
Posts: 37
Default Gap between rib flange and spar (practice kit)

I’m working on my last project kit before finally starting on my -10 in earnest. This is the control surface practice kit. When the ribs were clekoed to the front spar they were nice and tight; no gaps. As soon as I squeezed the rivets you could watch the flange open up ever so slightly. Same thing happened on both sides. What am I missing that is causing this? TIA!!
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  #2  
Old 08-06-2022, 04:55 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 8,423
Default

It's not enough to squeeze the rivet; you must also push/pull the rivet head firmly enough to close any gap prior to squeezing. Maybe you are, but are accidentally relaxing the pressure while you squeeze? This is why it's always recommended, when possible, to put the rivet head on the thinner piece of material, to make it easier to pull the 2 pieces together. Because you only have 2 rivets in this piece, it's much harder for one cleo to hold everything in tight. Next time try a small clamp near the rivet hole.
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  #3  
Old 08-06-2022, 05:02 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Setting rivets

Quote:
Originally Posted by BobTurner View Post
It's not enough to squeeze the rivet; you must also push/pull the rivet head firmly enough to close any gap prior to squeezing. Maybe you are, but are accidentally relaxing the pressure while you squeeze? This is why it's always recommended, when possible, to put the rivet head on the thinner piece of material, to make it easier to pull the 2 pieces together. Because you only have 2 rivets in this piece, it's much harder for one cleo to hold everything in tight. Next time try a small clamp near the rivet hole.
Yep. What he ^ said.
Another trick is the rubber hose doughnut. Buy a section of windshield washer hoses. One size fits 3/32" and one fits 1/8". Slice off a doughnut slightly thicker than the protruding rivet shank. When you set the rivet, the rubber doughnut forces parts together. Works for any rivet setting method.
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  #4  
Old 08-06-2022, 05:29 PM
swift12 swift12 is offline
 
Join Date: May 2021
Location: Palmerston North
Posts: 167
Default

Quote:
Originally Posted by wirejock View Post
Yep. What he ^ said.
Another trick is the rubber hose doughnut. Buy a section of windshield washer hoses. One size fits 3/32" and one fits 1/8". Slice off a doughnut slightly thicker than the protruding rivet shank. When you set the rivet, the rubber doughnut forces parts together. Works for any rivet setting method.
Yep what they said. I found the “doughnut” method works for me….small piece of hose sitting over the shank and squeeze with the pressure against the flush head….keeps those flanges very firm…..
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  #5  
Old 08-06-2022, 07:15 PM
TTaylor TTaylor is offline
 
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Location: Marysville, WA
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Default

Thanks guys! I’ll remember these tips for next time. I’ve seen the donut trick discussed by Plane Lady and Austin Manke, just wasn’t prepared at all for the way this morphed as the rivet squeezed. Thanks again!
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  #6  
Old 08-06-2022, 08:38 PM
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PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
Posts: 1,192
Default Ideas

Possibly the rib flange became distorted and the edges puckered up when the rivet shank swelled. If you drill out the rivets and disassemble (for practice) you will be able to see if there was contact between the parts directly around the hole.
As mentioned above it is preferable to have the factory head against the thinnest part.
Silicone surgical tube is good for doughnuts because it doesn't leave a black mark.
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  #7  
Old 08-07-2022, 02:00 AM
Mistfarer Mistfarer is offline
 
Join Date: Oct 2021
Location: West Midlands, United Kingdom
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Default

Quote:
Originally Posted by TTaylor View Post
Thanks guys! I’ll remember these tips for next time. I’ve seen the donut trick discussed by Plane Lady and Austin Manke, just wasn’t prepared at all for the way this morphed as the rivet squeezed. Thanks again!
Do you have a link to these videos?
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  #8  
Old 08-07-2022, 06:47 AM
Blw2 Blw2 is offline
 
Join Date: Apr 2022
Location: Saint Johns, FL
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I'm new to this....having a hard time understanding the positioning of this "doughnut"
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  #9  
Old 08-07-2022, 07:26 AM
Bgill Bgill is offline
 
Join Date: Sep 2017
Location: Douglas, GA
Posts: 119
Default I used “O” rings

I used thick O-rings with the same idea. Place the O ring on the rivet shank and when the squeezer closes, the O ring is compressed first - squeezing the aluminum sheets together before & during the rivet setting. Really helps out on the thin flange parts.
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  #10  
Old 08-07-2022, 08:11 AM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Doughnut

See below. It just slips over the shank.

Quote:
Originally Posted by Blw2 View Post
I'm new to this....having a hard time understanding the positioning of this "doughnut"
Quote:
Originally Posted by wirejock View Post
Another trick is the rubber hose doughnut. Buy a section of windshield washer hoses. One size fits 3/32" and one fits 1/8". Slice off a doughnut slightly thicker than the protruding rivet shank. When you set the rivet, the rubber doughnut forces parts together. Works for any rivet setting method.
__________________
Larry Larson
Estes Park, CO
E-mail: wirejock at yahoo dot com
Builder Blog: http://wirejockrv7a.blogspot.com
Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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