VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 10-29-2014, 03:11 PM
s10sakota's Avatar
s10sakota s10sakota is offline
 
Join Date: Feb 2005
Location: Westland, MI
Posts: 311
Default Rivets are deforming bulkheads!

Anybody know why this is happening? When I squeeze the rivets on the fuselage bulkheads, it's deforming the bulkheads. In fact, it was so bad on the F-705 bulkhead that I've scrapped all three lower pieces and re-ordered new ones.

Now as I'm riveting the second bulkhead, I squeezed two rivets and then noticed it's doing it again.

I'm clearly not over-squeezing them, but I'm not sure how to keep the bulkheads from deforming when I rivet them.

Here's two of the two rivets I just tried installing pics...





Do you see how when I squeeze the rivet it's pulling the bulkheads apart? I will drill these two out and straighten the bulkheads, but I don't know what to do differently with the new rivets!

Help!!
__________________
Mark Pensenstadler
1962 Piper Cherokee 160
2003 RANS S-10
2011 RANS S-6S
2011 Vans RV-7
2015 Zenith Cruzer
1962 Mooney M20C
2019 KITFOX Super Sport
Reply With Quote
  #2  
Old 10-29-2014, 03:23 PM
JonJay's Avatar
JonJay JonJay is offline
 
Join Date: Jan 2007
Location: Battleground
Posts: 4,348
Default

The rivets are swelling between skins. Clamp the flange as close to the rivet as you can before you squeeze. This should keep this from happening.
__________________
Smart People do Stupid things all the time. I know, I've seen me do'em.

RV6 - Builder/Flying
Bucker Jungmann
Fiat G.46 -(restoration in progress, if I have enough life left in me)
RV1 - Proud Pilot.
Reply With Quote
  #3  
Old 10-29-2014, 03:48 PM
David Paule David Paule is online now
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,061
Default

I've used short lengths of back fuel line, about the length of the exposed rivet tang, to press the flange down while riveting. Works very well.

Dave
Reply With Quote
  #4  
Old 10-29-2014, 03:52 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,590
Default

Yep, keep your parts clamped firmly together during riveting and this won't be a problem.
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Reply With Quote
  #5  
Old 10-29-2014, 04:11 PM
s10sakota's Avatar
s10sakota s10sakota is offline
 
Join Date: Feb 2005
Location: Westland, MI
Posts: 311
Default

Okay thanks for the replies. I like the idea of the black fuel line!
__________________
Mark Pensenstadler
1962 Piper Cherokee 160
2003 RANS S-10
2011 RANS S-6S
2011 Vans RV-7
2015 Zenith Cruzer
1962 Mooney M20C
2019 KITFOX Super Sport
Reply With Quote
  #6  
Old 10-29-2014, 05:09 PM
Echo Tango Echo Tango is offline
 
Join Date: Nov 2009
Location: SFO Approach
Posts: 204
Default

i have o-rings i put around my bucking bar

works great
Reply With Quote
  #7  
Old 10-29-2014, 05:54 PM
AAflyer's Avatar
AAflyer AAflyer is offline
 
Join Date: May 2009
Location: Fort Mill, South Carolina
Posts: 378
Default Backset

Wouldn't a backset do the same thing? You'll probably need a rivet backset for other parts of your build, and this might be the place to start. A backset has a collar that is spring loaded, so it will put good pressure on the parts, to close that gap. There might be a video in Hints for Homebuilders on the EAA site that will show you what I can't easily describe.

Of course this may not be appropriate for a round head rivet.
__________________
Bruce Windom
QB RV-8 N148BW
First Flight: Oct '16
AeroSport Power IO-360 180hp w/dual P-Mags
Catto 3-blade, with black carbon spinner.
10" Dynon SkyviewTouch. That's ALL.
Reply With Quote
  #8  
Old 10-29-2014, 06:16 PM
flion's Avatar
flion flion is offline
 
Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,708
Default

Yes, a back riveting set does the same kind of thing but I don't think I've seen one that would fit in a squeezer. I've generally found this to happen when the squeezer puts a side-load on the rivet and/or work. For example, if I'm trying to hold the work in one hand and operate the squeezer with the other hand, it is almost impossible to keep everything aligned. I get good results with a second pair of hands or putting the work in a vice so I can use both hands with the squeezer. If it feels like you need three hands, you probably do. The alternative is the rigidly mounted squeezer that you can use two hands to feed the work into. In either case, both the work and the tool need to be stable and aligned properly with each other.
__________________
Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
Reply With Quote
  #9  
Old 10-29-2014, 06:53 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,314
Default

Quote:
Originally Posted by Echo Tango View Post
i have o-rings i put around my bucking bar

works great
Good idea, consistent thickness and get an assortment at the hardware store.
__________________
Bill

RV-7
Reply With Quote
  #10  
Old 10-29-2014, 07:33 PM
Norman CYYJ Norman CYYJ is offline
 
Join Date: Feb 2005
Location: Victoria B.C.
Posts: 1,438
Default

You can draw the rivet, squeeze the parts together then set the rivet.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 12:11 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.