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-   -   Nutplates on Inboard Wing (https://vansairforce.net/community/showthread.php?t=106748)

jswareiv 11-18-2013 08:05 PM

Nutplates on Inboard Wing
 
Wondering how everyone dimpled the nutplates on the inboard wing, Section 16, Top Wing Skins(New Numbering, I think the old was 14). Did you dimple through all three pieces together, the top skin, the doubler and the rib, or separate out the parts and just dimple the top skin for the #8 screw. If so, how did you address the wing walk doubler? I had someone suggest to separate them, then drill an oversize hole for the dimple to sit in, in both the wing walk and the rib. Suggestions? Also, what did y'all use as .032 skin or scrap to test the fit of the mating of the two top skins? Thank you for any help you can give.

M McGraw 11-19-2013 07:46 AM

Quote:

Originally Posted by jswareiv (Post 827352)
Wondering how everyone dimpled the nutplates on the inboard wing, Section 16, Top Wing Skins(New Numbering, I think the old was 14). Did you dimple through all three pieces together, the top skin, the doubler and the rib, or separate out the parts and just dimple the top skin for the #8 screw. If so, how did you address the wing walk doubler? I had someone suggest to separate them, then drill an oversize hole for the dimple to sit in, in both the wing walk and the rib. Suggestions? Also, what did y'all use as .032 skin or scrap to test the fit of the mating of the two top skins? Thank you for any help you can give.


I countersunk the inboard top skins and dimpled the bottom inboard skins. With one exception. The aft most top inboard skin hole is dimpled.

rvbuilder2002 11-19-2013 08:39 AM

Quote:

Originally Posted by M McGraw (Post 827447)
I countersunk the inboard top skins and dimpled the bottom inboard skins. With one exception. The aft most top inboard skin hole is dimpled.

I think this is (should be) what the construction manual describes to do.

jswareiv 11-19-2013 09:20 AM

Countersinking for Nutplates
 
O.K., it doesn't say specifically to CS the other holes in step #4, but I guess because it calls out that one nutplate to dimple, the "assumption" is to CS the others. Thanks.

propsync 11-19-2013 09:49 AM

Quote:

Originally Posted by jswareiv (Post 827352)
Wondering how everyone dimpled the nutplates on the inboard wing, Section 16, Top Wing Skins(New Numbering, I think the old was 14). Did you dimple through all three pieces together, the top skin, the doubler and the rib, or separate out the parts and just dimple the top skin for the #8 screw. If so, how did you address the wing walk doubler? I had someone suggest to separate them, then drill an oversize hole for the dimple to sit in, in both the wing walk and the rib. Suggestions? Also, what did y'all use as .032 skin or scrap to test the fit of the mating of the two top skins? Thank you for any help you can give.

There seems to be confusion on this part.

If I am understanding what you are asking, you do not dimple any of those parts. The 4 inboard ribs (top), the doublers, and the skins are not dimpled at all, including where the nutplates are. You countersink the top skin only in those locations. The only dimple there should be is at the very trailing edge of the top skin and that is the center hole for the last nutplate.

See where I have circled in this pic, that is the only hole that is dimpled. :)


Andrew M 11-19-2013 10:41 AM

Looked ahead
 
and dimpled everything prior to assembly. The nut plates are secured to the rib only.

jswareiv 11-19-2013 12:44 PM

So you are CS the holes for the #8 screw and all of the rivets for the nutplates (different sizes of course), except the one at the bottom and that one is getting dimpled. So CS the parts in place, then separate, debur & prime. Correct?

rvbuilder2002 11-19-2013 12:47 PM

Quote:

Originally Posted by Andrew M (Post 827519)
The nut plates are secured to the rib only.

This not correct.
A Van's Aircraft design standard is that nutplate attach rivets never get buried (making them difficult to replace if needed).

rvbuilder2002 11-19-2013 12:49 PM

Quote:

Originally Posted by jswareiv (Post 827564)
So you are CS the holes for the #8 screw and all of the rivets for the nutplates (different sizes of course), except the one at the bottom and that one is getting dimpled. So CS the parts in place, then separate, debur & prime. Correct?

I prefer to do it after final assembly/riveting.
Machine countersink deep enough for a #8 screw dimple.

propsync 11-19-2013 01:11 PM

Quote:

Originally Posted by rvbuilder2002 (Post 827568)
I prefer to do it after final assembly/riveting.
Machine countersink deep enough for a #8 screw dimple.

Agree. I simply followed the order of the plans. After everything (skin) was riveted, that's when I countersunk the screw holes. It's basically one of the last steps of the entire section, (14-04 step 2).


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