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  #1  
Old 05-09-2011, 10:41 PM
Mark Jackson Mark Jackson is offline
 
Join Date: Oct 2009
Location: Houston
Posts: 65
Default Stupid riveting question

I have gotten to the step of riveting the elevator spars. Which side do the shop heads go on, front or rear? It doesn't appear to be specified in the drawings which only specify the rivet size. I looked through chapter 5 several times but it doesn't say.

Is there a convention like bolts (head always to the front)?

Thx,

Mark Jackson
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  #2  
Old 05-09-2011, 11:06 PM
Sig600 Sig600 is offline
 
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Default

Pay close attention to the plans, the call outs should dictate which way everything goes.
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  #3  
Old 05-09-2011, 11:22 PM
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SeanB SeanB is offline
 
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Location: Colorado Springs
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Default

Unless specified otherwise, the manufactured head (from the factory) is on the thinner material. Examples would be the flange of a rib, a thin web, skins, etc.

Shop heads (the ones you make) usually go on the thicker material. Examples are: doublers, thicker flange, etc.

This keeps method prevents the thinner material from disorting while compressing the rivet.

There are some times this is not possible due to access. Do what you are able in those cases.
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  #4  
Old 05-09-2011, 11:27 PM
DaAV8R DaAV8R is offline
 
Join Date: Jul 2009
Location: Lee's Summit, MO
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Default Rivets

It isn't called out on the plans. Do a search and you'll find lots of threads on the subject. One school of thought is to put the manufactured head to the outside. Another other school of thought is to put the manufactured head on the thinnest material. Often times, the best way is the direction that allows the easiest setting of the rivet. I put the manufactured head to the outside on the empennage spars and did see a little bowing of the spar after riveting. I think if you put the manufactured head to the inside on the thinner material, you won't get as much deformation.
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  #5  
Old 05-10-2011, 06:05 AM
John R. Graham John R. Graham is offline
 
Join Date: Dec 2010
Location: Alpharetta, GA
Posts: 88
Default MIL Spec MIL-R-47196A

MIL-R-47196A says:
Quote:
Section 3.3.3.1 - Head direction. Unless specified on the engineering drawing or specification, the manufactured head of the rivet shall be located on exterior surfaces.
- John
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  #6  
Old 05-10-2011, 06:39 AM
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Lemmingman Lemmingman is offline
 
Join Date: Jun 2010
Location: McKinney, TX
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Default

I asked a similar question before. The answer I was given made perfect sense. Vans rivet call out gives you the answer.
Quote:
AN470AD4-7 all HS-412PP to HS-609PP to HS-603PP rivets
The order the material is listed is the order that the rivet will pass through. The factory head sits against HS-412PP and passes through HS-609PP and the shop head sits against HS-603PP. This has worked for me so far.
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  #7  
Old 05-10-2011, 07:04 AM
doug_rv7 doug_rv7 is offline
 
Join Date: May 2005
Location: Lincoln, NE
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Default RVator

Van's had a article on this in an old RVator a few years back. Their conclusion was it didn't matter. I've had good luck using Sean B's theory.

Doug
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