VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #11  
Old 02-15-2020, 04:19 PM
JonJay's Avatar
JonJay JonJay is offline
 
Join Date: Jan 2007
Location: Battleground
Posts: 4,283
Default

Quote:
Originally Posted by kbalch View Post
I'd never encountered this myself until, early in my -14A project, I found that I all of a sudden wasn't able to properly drive rivets (with a gun and bucking bar, no less) anymore. Since I knew that my technique hadn't suddenly gone away after all these years, I ordered a fresh batch of rivets and the problem immediately resolved itself.

Clearly, something was wrong with the original rivets I'd received with my kit. Whether they'd never been properly tempered, or perhaps they'd age hardened, I can't say, but they were definitely "bad" and the replacements (and every other rivet I've ever received) were not.

Weird, right?
Your experience isnít unusual. I havenít seen anything supporting that rivets change temper over time. I hope someone has an explanation. Weird is right, but it seems to happen.
__________________
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
  #12  
Old 02-16-2020, 03:14 PM
Marc Bourget Marc Bourget is offline
 
Join Date: Apr 2009
Location: Stockton, California
Posts: 242
Default

In the 70's I used to get "new" rivets from Fullerton Air Parts. Picked them up on Thursday, as they were the freshest. Would drive well at 60 psi at the gun. Within 3 days, 80 psi and longer burst.

Then after talking to a "pro" I used the HT ovens at Fullerton Community College. Problem is, Temp control is very important for annealing. 10 degree window at around 925 deg. (from memory, check yours). I think if you exceed 938 you "kill" the rivet.

After annealing (only with clear anodized rivets) they'd drive at 40 lbs in 4 hits as I VERY CAREFULLY tickled the trigger. In 3 days, I was back to 80 psi with the long burst.

Reynolds Aluminum has a reference book. Consider taking the rivets to "W" temper (what most people call "annealing" by burning off Sharpie ink or soot).

Soft rivets stretch the skin the least and results in much better airfoils, etc.

FWIW
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 09:09 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.