VansAirForceForums  
Home > VansAirForceForums

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

- Today's Posts | Insert Pics

  #11  
Old 11-30-2017, 06:12 AM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 952
Default

By the geometry, there shouldn't BE a gap.

I suspect what happens is the center of the 120 degree rivet gets pulled into the 100 degree dimple/countersink after the perimeter makes first contact, resulting in a slightly misshapen factory head and a sunken center around the mandrel hole in the pulled rivet. The outer edge of the factory head may pucker or become wavy in this process. I certainly have lots of examples I could examine under magnification here, as I own no 120 degree dies or CSK and have pulled lots of CS4-4's. Will have to scope that detail out next time in the shop...
__________________
Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
Reply With Quote
  #12  
Old 11-30-2017, 09:39 PM
vernon smith's Avatar
vernon smith vernon smith is offline
 
Join Date: Jun 2017
Location: Naples FL
Posts: 104
Default

Yes, with two different metals being forced into each other, different accommodation configurations would not be unexpected. I ordered the right dies yesterday and appreciate the fact that the forum has enlightened me. For some reason I assumed the CS pops were 100 degree. Question is, why arn't they? Any pop (pull) rivet experts out there?
Reply With Quote
  #13  
Old 12-01-2017, 08:11 AM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 952
Default

Bottom line (at least on my 6A 20 years ago) was that the pre-primer scuff/sand and a little filler makes the mandrel holes and any raised flash around them disappear forever under the urethane.
__________________
Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
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 09:06 AM.


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.