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  #1  
Old 12-03-2012, 05:59 PM
RV7AJeremy's Avatar
RV7AJeremy RV7AJeremy is offline
 
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Angry "deburred" too deep

So I have my father in town helping me with the project. I showed him how to deburr then I got distracted and stepped away for a few minutes. When I came back, I saw just how far the deburring bit went into the material. The material just so happens to be my longeron!!!! About half of the holes, from about the midway point aft, are countersunk enough that a NAS rivet sits flush. I am going to email vans in the morning but what is the consensus from the group? I am a little nervous.....and not very happy with myself to not watch over him for a few.

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  #2  
Old 12-03-2012, 06:17 PM
fehdxl fehdxl is offline
 
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Jeremy, Aren't they supposed to sit flush? The one rivet in the picture looks fine by me. What am I missing? -Jim Edit: Oh yeah, you said debur...not countersink. I think I'd just use AN426's and press on.
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  #3  
Old 12-03-2012, 06:37 PM
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Default possible fixes

Just for clarification, this is the backside of the longeron, the front is countersunk to accommodate an AN426AD3 rivet.

I think I may have options:
1. Drill out to accept an NAS1097AD4 rivet

2. Drill out and re countersink and dimple for an AN426AD4 rivet

3. If vans gives me the go ahead just use an AN426AD3 rivet (might need a slightly longer length).

Thoughts anyone?
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  #4  
Old 12-03-2012, 06:46 PM
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Quote:
Originally Posted by RV7AJeremy View Post
Thoughts anyone?
My guess is Vans would tell you use 3.5 rivets and proceed further. Don't drill it to AD4!
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  #5  
Old 12-03-2012, 06:59 PM
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If you use a little longer rivet you will have just made a double flush joint.

It should have essentially the same strength as the plan joint - I bet Van says go ahead, but let us know the factory recommendations...
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  #6  
Old 12-03-2012, 08:10 PM
fehdxl fehdxl is offline
 
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BTW, related to father's helping out. I was showing mine how the DRDT-2 works on some scrap. You know, drill a couple holes, show him how it makes dimples. He takes control with the scrap and I walk away. A few minutes later I go to use it and it just doesn't feel right. Seems that it just won't squeeze enough. Did you guess it? Sure enough, he practiced dimpling a couple more times where there was no hole. The male dimple die just punched right through. Yes, it took a little while to drill out the aluminum that was pressed into the female die. Best to you, -Jim
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  #7  
Old 12-03-2012, 08:16 PM
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  #8  
Old 12-04-2012, 06:55 AM
Pat Stewart Pat Stewart is offline
 
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I agree with Gil and would double flush and move on.

Pat
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  #9  
Old 12-04-2012, 07:58 AM
N427EF N427EF is offline
 
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I think you already have the answers.
As to deburring, I almost always used the hand deburring set.
Especially if you try to keep someone busy who might not be up to speed on everything. The light weight tool in your hand vs. the heavier powertool
and the time gained is very minimal and you will not over deburr.
For me, it was always a good time to reflect on the project while twisting away on the deburring tool.YMMV
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  #10  
Old 12-04-2012, 08:39 AM
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I'm curious. What tool and technique did you instruct here? The suggestion for ALWAYS using the hand deburring tool (2 turns, tops) is a good one.
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