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  #1  
Old 10-31-2018, 08:09 AM
romanov's Avatar
romanov romanov is offline
 
Join Date: May 2018
Location: Israel
Posts: 108
Question Damaged dimple on a skin, is it fatal?

Hi Guys ,

I need your educated opinion here, we damaged a
dimpled holes a bit, what do you think is it so
bad that requires a new skin?

here is what happened:

We just started to scuff the VS skin (VS-801PP)
as a preparation for priming / coating.

Accidentaly we applied too much force on the inner side where dimpled cone is.

As a result there are a few dimpled holes that are a bit larger now: (about 0.15mm) and they are a bit flatened , you can see the results on pictures attached. Also
have to add here that the front side of the holes is
completely fine.

Please advise if it may cause a problem or may affect the structure strenght.

The big question now is , whether we can continue with that skin or we have to order a new one.

Looking forward for your recommendations.


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Last edited by romanov : 10-31-2018 at 08:14 AM.
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  #2  
Old 10-31-2018, 08:18 AM
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bkervaski bkervaski is offline
 
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Location: Birmingham, Alabama
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The general rule is that you can adjust a dimpled hole one time, either reversing it (if you dimpled the wrong direction) or re-dimpling. After that, the aluminum is considered fatigued and needs to be replaced.

I would try to dimple them again first, but just once. If that doesn't fix it for you the best solution is to just get another part and consider that one practice .. I had lots of "practice"
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Last edited by bkervaski : 10-31-2018 at 08:30 AM.
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  #3  
Old 10-31-2018, 08:29 AM
iwannarv iwannarv is offline
 
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Location: Olathe, KS
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Vans is the final say, but these aren't 'reverse dimpled'. I'd say touch them up with dimple dies again and let the rivet do its job, maybe upsize one length rivet.

EDIT: The heavy mechanical scuffing method may lead to more issues and would change my recommendation.
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Last edited by iwannarv : 10-31-2018 at 01:39 PM.
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  #4  
Old 10-31-2018, 08:47 AM
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Personally I would go to 1/8" rivets in these holes. You are using way too much scuffing force. Very little scuffing is needed, especially if you are using a self-etching primer.
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  #5  
Old 10-31-2018, 08:52 AM
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romanov romanov is offline
 
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Location: Israel
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Question

Thanks guys, the mail to Vans been
sent. Your ideas are very interesting.

How often people go to 1/8 rivet
while killing 3/32 holes?
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  #6  
Old 10-31-2018, 09:44 AM
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wirejock wirejock is offline
 
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Default Process

Consider changing the process. Scuff before dimpling.
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  #7  
Old 10-31-2018, 10:00 AM
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Brantel Brantel is offline
 
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How the heck did you scuff the skin hard enough to both flatten a dimple and enlarge a hole? How is this even possible? What are you using to scuff ?
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  #8  
Old 10-31-2018, 10:05 AM
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Default Oops Rivets..

..have the same head as an AN-3 but the shank of an AN-4. However, if this condition is over a whole lot of holes, I'd start again, since you've hardly begun.
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  #9  
Old 10-31-2018, 10:05 AM
rocketman1988 rocketman1988 is offline
 
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Default ...and

And remember, if you need to go up a shank size, you can use "Oops" rivets. They have the same sized hand as the specified rivet but the shank is one size larger...
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  #10  
Old 10-31-2018, 10:09 AM
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romanov romanov is offline
 
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Quote:
Originally Posted by ppilotmike View Post
..have the same head as an AN-3 but the shank of an AN-4. However, if this condition is over a whole lot of holes, I'd start again, since you've hardly begun.


That one. Wont do it again.
https://imgur.com/6j97R5H

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Last edited by romanov : 10-31-2018 at 10:25 AM.
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