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copying holes

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carlossa52(at)gmail.com
Guest

Posted: Wed Jul 16, 2008 5:46 pm Post subject: copying holes

Hello, all

How have you copied a hole pattern from one part to a new part, without damaging (i.e., making them bigger, oval) the existing holes?



In my case, the wing ribs have already been drilled to A4 size, and I am going to discard the old skin.

 I think the least laborious way of doing this would be to back-drill the skin, from inside the wing.

But how do I make sure I won't enlarge the holes on the ribs?



Thanks in advance for your comments / suggestions.

 

Carlos

do not archive



  [quote][b]

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craig(at)craigandjean.com
Guest

Posted: Wed Jul 16, 2008 10:52 pm Post subject: copying holes

How about a transfer punch?  

   

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3577  

   

Or just search www.harborfreight.com for item number 3577-2VGA.  

   

Remember that pulled rivets do expand in their holes. So some enlargement of the existing holes is tolerable. I think there is something in the Zenith construction standards about this.  

   

-- Craig  

     

From: owner-zenith701801-list-server(at)matronics.com [mailto:owner-zenith701801-list-server(at)matronics.com] On Behalf Of Carlos Sa

 Sent: Wednesday, July 16, 2008 7:46 PM

 To: zenith701801-list(at)matronics.com

 Subject: copying holes  

  

     

Hello, all

 

 

 How have you copied a hole pattern from one part to a new part, without damaging (i.e., making them bigger, oval) the existing holes?

 

 In my case, the wing ribs have already been drilled to A4 size, and I am going to discard the old skin.

 I think the least laborious way of doing this would be to back-drill the skin, from inside the wing.

 But how do I make sure I won't enlarge the holes on the ribs?

 

 Thanks in advance for your comments / suggestions.

 

 Carlos

 do not archive  

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       [quote][b]

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john.marzulli(at)gmail.co
Guest

Posted: Thu Jul 17, 2008 1:37 am Post subject: copying holes

If you are copying the holes from the ribs, then doing back-drilling one skin at a time should work. Otherwise, you can make a strap duplicator easily using a few rivets and two spent hack saw blades.



 GOOD LUCK and DO NOT ARCHIVE



John Marzulli



http://701Builder.blogspot.com/

http://www.GenevieveMarzulli.org/

 http://www.JohnMarzulli.net/ 



On Wed, Jul 16, 2008 at 6:45 PM, Carlos Sa <carlossa52(at)gmail.com (carlossa52(at)gmail.com)> wrote:

[quote] Hello, all

How have you copied a hole pattern from one part to a new part, without damaging (i.e., making them bigger, oval) the existing holes?



In my case, the wing ribs have already been drilled to A4 size, and I am going to discard the old skin.

  I think the least laborious way of doing this would be to back-drill the skin, from inside the wing.

But how do I make sure I won't enlarge the holes on the ribs?



Thanks in advance for your comments / suggestions.

  

Carlos

do not archive



   	  Quote: 	
		  

	
[b]

- The Matronics Zenith701801-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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carlossa52(at)gmail.com
Guest

Posted: Thu Jul 17, 2008 5:38 am Post subject: copying holes

Hello, Craig

This is one of the many tools out thre I didn't know existed...

If I understand it well, you place it in the hole (in my case, the rib's), with the target piece under it (the skin), and tap it so you get an indentation at the centre of the location where the hole needs to be?

 

Nice.



Thanks for writing



Carlos



2008/7/17 Craig Payne <craig(at)craigandjean.com (craig(at)craigandjean.com)>:

[quote]              

How about a transfer punch?  

   

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=3577   

   

Or just search www.harborfreight.com for item number 3577-2VGA.  

   

Remember that pulled rivets do expand in their holes. So some enlargement of the existing holes is tolerable. I think there is something in the Zenith construction standards about this.  

   

-- Craig  

 



[b]

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n85ae

Joined: 14 Mar 2007
Posts: 403

Posted: Thu Jul 17, 2008 6:48 am Post subject: Re: copying holes

Can you lay the old skin on top of the new skin as a drilling template?

This would be the easiest way. Lay the new skin on a sheet of plywood,

and drill and cleco the old skin right on top of if clecoing all the way

through into the plywood. I did this with my cabin floor after I discovered

that the lines drawn by Zenith were incorrect and I had trimmed to the lines.

Every single hole matched perfectly.



I don't think you can use a hole finder on wing skins as the edge to hole

distance would be excessive.



Regards,

Jeff

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carlossa52(at)gmail.com
Guest

Posted: Thu Jul 17, 2008 6:57 am Post subject: copying holes

Good idea, Jeff, but the reason I have to go through this operation in the first place is that the original skin isn't square.

That's why I want to use the holes in the ribs as a guide. Using the skin is not impossible, but it represents more work (I would have to reposition it for each rib station).

 (A hole finder is unnecessary, the structure is still just clecoed.)



Thanks for the comment.

Carlos



2008/7/17 n85ae <n85ae(at)yahoo.com (n85ae(at)yahoo.com)>:

 [quote]--> Zenith701801-List message posted by: "n85ae" <n85ae(at)yahoo.com (n85ae(at)yahoo.com)>

  

 Can you lay the old skin on top of the new skin as a drilling template?

 This would be the easiest way. Lay the new skin on a sheet of plywood,

 and drill and cleco the old skin right on top of if clecoing all the way

 through into the plywood. I did this with my cabin floor after I discovered

 that the lines drawn by Zenith were incorrect and I had trimmed to the lines.

 Every single hole matched perfectly.

 

 I don't think you can use a hole finder on wing skins as the edge to hole

 distance would be excessive.

 

 Regards,

 Jeff

 

 

 [b]

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n4546v(at)mindspring.com
Guest

Posted: Thu Jul 17, 2008 7:44 am Post subject: copying holes

Do not archive

I botched a set of 701 wing skins and made a set of LONG hole finders to do

this exact job.  I made them from the widest pallet banding material I could

find in the dumpster.  Long enough to reach from trailing edge to the main

spar.



If you decide to go this route I could send pictures.



Regards,



Randy, Las Vegas





 	  Quote: 	
		   I don't think you can use a hole finder on wing skins as the edge to hole

 distance would be excessive.



 Regards,

 Jeff

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