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acceptable defects on universal head rivets??

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ceengland(at)bellsouth.ne
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Posted: Tue Oct 10, 2006 12:00 pm Post subject: acceptable defects on universal head rivets??

Just saw this on another list:



Per MIL-STD-403C (the revision level of the paper copy [he has]) para

5.2.7.5:

 "Marring of the manufactured head.  A cut or ring caused by the riveting

equipment shall be acceptable on non-flush rivets providing the depth of

the cut is not greater than one-fourth of the head height.  Cut or ringed

flush rivets shall not be acceptable."



Anybody who's familiar with either mil-spec standards or FAA 'best practices' that knows whether this is valid? I'm not advocating sloppy work, but I can remember drilling out a few 1/8" rivets due to minor errors with the universal set & making a bigger problem when I did it. If the quote above is accurate, I'd bet there are quite a few projects out there that would be better off carrying around a few 'smiles'.



Charlie

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frank.hinde(at)hp.com
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Posted: Tue Oct 10, 2006 12:22 pm Post subject: acceptable defects on universal head rivets??

No smiles on my project....My nose just got longer!



Frank 



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sshook(at)cox.net
Guest

Posted: Tue Oct 10, 2006 12:23 pm Post subject: acceptable defects on universal head rivets??

I can't quote mil specs or FAA regs while I'm at work because I don't have

them in front of me, but I do know that the Aircraft Structural Technician

book that I bought from Cleaveland Tool says roughly the same thing.  There

are some pretty interesting pictures about how the shop heads should look

and smiles on the manufactured head and what is acceptable or not.



Quite frankly I was surprised at what was shown to be acceptable.  I too

have fallen into the trap of trying to drill out rivets that would have been

acceptable by this standard and in the process, created other problems.



Scott & Jenni

RV-7A N696JS

Working on left Tank



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tadsargent(at)bellsouth.n
Guest

Posted: Tue Oct 10, 2006 3:33 pm Post subject: acceptable defects on universal head rivets??

Charlie I remember reading a test on rivet strength.  On pull test an ugly 

nail looking or a universal head was 9\0% as strong as a beautiful one.  And 

lest we forget there is another rivet 1.5" down the road.

Stripes

7A 160 hours

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