[SEL] More Rivet Pictures on Muffler

[Rupert Wenig]

Hello Paul,
	I just looked it up in my book on aircraft riveting. This is for 
aluminum rivets but info for steel rivets should be similar. It tells me 
to use a 3/32" brazier head rivet 1/4" long to get heads that would look 
similar to those in the pictures. The riveting was most likely done at 
the factory using a squeeze riveting machine.
	It's not worth heating a rivet that small as it would cool before you 
could do any head forming. This is how I would do it- Install the rivet 
from the inside and use a heavy bar mounted in a vise to hold the rivet 
in place and to use as a bucking bar for the inside. I wouldn't be too 
concerned if the head gets deformed as it won't be seen anyway. You 
could drill or machine a dimple in the bar to set the rivet head into if 
you want to maintain the head shape. I would form the outside head with 
simple swift blows using about an 8 oz. hammer. The head will form as 
shown in your picture of the out side rivet head if you hit the end of 
the rivet squarely. This takes a bit of practice to get it right. The 
following formula give the proper dimensions of the formed head: dia. of 
formed head= 1 1/2 x dia. of rivet; thickness of formed head= 1/2 x dia. 
of rivet.
	A round head rivet should work well on the inside if you have trouble 
finding a brazier head rivet.
	Hope that helps you out.
Rupert

Paul Maples wrote:
> Ok Gang I took the muffler apart today and got some more pictures and measurements. As you will remember here is a picture of the line of rivets on the outside of the muffler:
> 
> http://i52.photobucket.com/albums/g36/wheelterrapin/StoverRebuildMuffler397.jpg
> 
> I measured the top of the rivet on the outside of the muffler shell and it is roughly 1/4":
> 
> http://i52.photobucket.com/albums/g36/wheelterrapin/StoverRebuildMuffler398.jpg
> 
> Looking inside of the shell where the end of the rivet was bucked the head is roughly 3/8" in diameter:
> 
> http://i52.photobucket.com/albums/g36/wheelterrapin/StoverRebuildMuffler399.jpg
> 
> As best as I can measure the thickness of the shell (single layer) using my vernier it is roughly .043 and I say roughly as the metal on the shell is heavily rusted. This would make the lap joint thickness about .086 or somewhere in there:
> 
> http://i52.photobucket.com/albums/g36/wheelterrapin/StoverRebuildMuffler400.jpg
> 
> So now I need to select the right size rivet, the right length, the right staking and setting tool and get with it. There are 13 rivets. So now you rivet experts come through for me and fill in what I need and then I will try and get it. To get a rivet with the head you see in the picture do I order a special rivet or just use a special staking and setting tool to get the head design? Since the top of the rivet head is about 1/4" and the bottom of the rivet where it is peened over is about 3/8" what shaft size rivet would you suggest I get? And since the total thickness of the lapped joint appears to be about .086 thickness what length would you suggest I get?
> 
> Thanks for the help.
> 
> Paul
> 
> 
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-- 
--
yvt

Rupert Wenig
Camrose, Alberta, Canada.	
		
http://www3.telus.net/public/rwenig/