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-   -   Tough set of rivets on tail cone under J stiffeners (https://vansairforce.net/community/showthread.php?t=135456)

ERushing 03-08-2016 03:45 PM

The rivets I was referring to were the 6 AN470AD4-4 joining the bellcrank ribs to the F-1007 frame. The ones nearest the skin are a pain.

It looks like you should be able to rivet everything up prior to attaching the F-1037B & C rob angles but that's not the way I did it. If you're thinking about doing it that way, I'd cleco everything up and make sure you have all the access you need to get to those rivets without things becoming too awkward. It would be a real pain to have to drill out all those skin rivets if things went bad.

The upside of your approach would be that you could likely get the rivets closest to the skin with a bit easier.

Personally, I'd just follow the plans but substitute pulled rivets on the two PITA rivets closest to the skin. IIRC, the skin rivets on the bellcrank ribs were a breeze. Just use a swivel mushroom set, some tape over the rivet heads to protect the skin, and your tungsten bucking bar. As long as you have a rivet buddy anyway, those should go quickly.

BenNabors 03-09-2016 10:48 AM

Question on rivet hole size
 
Quote:

Originally Posted by MElstien (Post 1060357)
Any help or advice would be appreciated.

Question: the hole looks like is was dimpled with the wrong size dimple and is oversized. The rivet should be the same diameter as the un-bucked rivet. Are all your rivet holes oversized? There is a tolerance in the mil-spec on hole size.

MElstien 03-11-2016 02:36 PM

Hello, I have been traveling and unable to respond with proper information. I must say I was worried about the comment about the oversized hole. I am glad when I got home I was able to do some research and take some measurements.

Yes, that hole does look larger than it should be. I do not know why. That rivet, has been set and I cannot go back now and re-measure. But, I can use any parts that have not been assembled yet to check my work and recheck my dies. I use Cleaveland Tool dies, but I do have other sets as well.

I know I dimpled all those bulkheads and J-Stiffeners at one sitting with one set of dies in the pneumatic squeezer. I know when dimpling the J-stiffeners and bulkheads and anything with a flange, I used the small diameter dimple die. The only small diameter die I have is a -3 from Cleaveland. I use the small diameter die to make sure the outer edge of the die does not fall over the bend in the flange and deform the part. (I did that once on my sample airfoils)

So I went and measured the dimples of those parts on the pieces that I have not assembled yet. The upper skin J-Stiffeners, the bellcrank ribs etc. All the dimples conform to the measurements in the below pictures and thread links at 0.103 or 0.104. (Not the larger substructure hole diameters). Nothing larger. Does this meet the mil-spec listed, no, but the mil- spec does not cover dimpled holes, only countersunk holes for 426 rivets. This forum has many threads on this topic. I copied one with pictures into this post. My holes that have not been dimpled, the longeron holes, have a nice tight rivet fit as per MIL-Spec.

I then took all my -3 dimple dies and proceeded to make test runs in all various combinations to see if maybe, one was mis-marked or larger than it should be. They we all OK. To quote Warner Wolf (NY Sports Broacaster), lets go to the video Tape. I went and viewed my dimpling and confirmed that all J-Stiffeners were dimpled using the same pneumatic squeezer and dies at one sitting. (1-24-2016)

http://i601.photobucket.com/albums/t...B99C6EB99B.jpg

Thread http://www.vansairforce.com/communit...imple+diameter

I believe I am OK and that picture is deceptively showing an excess amount of gap. I will review all those rivets later tonight.


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