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Plans Section 26 and 29 - dimpling

 
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ron.mcgann(at)baesystems.
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PostPosted: Fri Feb 03, 2006 2:20 pm    Post subject: Plans Section 26 and 29 - dimpling Reply with quote

Hi all,

My tribulations with Section 29 and the side skins continue.

Following is a query to Vans:

"I did not notice anything in the plans about dimpling F-1015B intercostals or F-1015A Outboard Footwell ribs in Section 26. Section 29 calls for AN426 rivets and seems to assume that the understructure has been countersunk or dimpled. The top half of the F1015B behind the F-1015F can be readily dimpled, as can most holes in the F-1015A (using a pop rivet dimpler). I cannot however dimple the overlap between the 1015B and 1015A (insufficient dimpling pressure from the pop rivet dies to dimple both skins together).

Is countersinking the F1070 side skins for 426 rivets (rather than dimpling the skins and understructure) acceptable along the vertical row of holes joining the skin, 1015A and 1015B?"

Vans Response:

"We have recently discovered this, and will be revising the instructions slightly.

In your case, rather than c'sinking the skins, engineering suggests that you drill the holes that won't/can't dimple to #30 and installing 470AD4 rivets. These are inside the profile of the wing and won't be seen when the wing and root fairing are installed."

If I remember right, Section 26 does not address preparation of the F1015A at all.

Vans acknowledges a deficiency in the plans. For those that have preceded, how did you treat this issue? Is there some other way of dimpling these overlapping parts?

thx,

Ron #187


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seipel(at)seznam.cz
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PostPosted: Fri Feb 03, 2006 3:30 pm    Post subject: Plans Section 26 and 29 - dimpling Reply with quote

I dimpled the top half of the 1015A and then countersunk the part that
overlaps with the 1015B. I dimpled the F1070 side skins.

PJ
RV-10 #40032

McGANN wrote:
Quote:
Hi all,

My tribulations with Section 29 and the side skins continue.

Following is a query to Vans:

"I did not notice anything in the plans about dimpling F-1015B intercostals or F-1015A Outboard Footwell ribs in Section 26. Section 29 calls for AN426 rivets and seems to assume that the understructure has been countersunk or dimpled. The top half of the F1015B behind the F-1015F can be readily dimpled, as can most holes in the F-1015A (using a pop rivet dimpler). I cannot however dimple the overlap between the 1015B and 1015A (insufficient dimpling pressure from the pop rivet dies to dimple both skins together).

Is countersinking the F1070 side skins for 426 rivets (rather than dimpling the skins and understructure) acceptable along the vertical row of holes joining the skin, 1015A and 1015B?"

Vans Response:

"We have recently discovered this, and will be revising the instructions slightly.

In your case, rather than c'sinking the skins, engineering suggests that you drill the holes that won't/can't dimple to #30 and installing 470AD4 rivets. These are inside the profile of the wing and won't be seen when the wing and root fairing are installed."

If I remember right, Section 26 does not address preparation of the F1015A at all.

Vans acknowledges a deficiency in the plans. For those that have preceded, how did you treat this issue? Is there some other way of dimpling these overlapping parts?

thx,

Ron #187







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owl40188(at)yahoo.com
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PostPosted: Thu Feb 09, 2006 6:40 am    Post subject: Plans Section 26 and 29 - dimpling Reply with quote

I had contacted Vans about this also.  Their response was:
 
"The holes in F-1015A that correspond to the flush
rivets in the skin as shown on 29-17 need to be dimpled.  If you
didn't dimple the row of holes nearest the bottom skin in the rib,
you can use AN470AD4 rivets if you want to."
 
What I have done is order a dimpling tool from Avery which is used in a rivet gun.  This allows you to put a decent amount of force on it.  The tool is a bit awakward in tight places but I managed to use it.  additionally if you have a slightly large dimple die like the ones used for the fuel tanks that will help also.
 
Niko
40188
---


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Rick S.



Joined: 12 Feb 2006
Posts: 347
Location: Las Vegas

PostPosted: Sun Feb 12, 2006 6:46 pm    Post subject: Re: Plans Section 26 and 29 - dimpling Reply with quote

Jeez...I finished these this week and it was a pain. Rolling Eyes I Csunk the middle verticle row, used the squeezer on the top row then rounded my pop rivet die so it fit in the flange for the bottom. turned out OK, the one rivet at the rear spar I used a rivet and hit it with a sucide rivet set with a female dimple die on the back side held in vise grips...worked but I would not want to chance that method to often for fear of slipping off and poking a new hole. Shocked What about the one lower hole left undimpled in the rib just aft of that? I could not find where that was to get dimpled although it has to. For you guys doing these ribs now, drill and dimple them before you install them, it will save you a ton of time.

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Rick S.
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jim(at)CombsFive.Com
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PostPosted: Mon Feb 13, 2006 2:47 pm    Post subject: Plans Section 26 and 29 - dimpling Reply with quote

Congratulations!!!!

-Jim C

do not archive


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