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Straightening warped pieces?

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rv10(at)colohan.com
Guest

Posted: Fri Feb 12, 2010 12:57 am Post subject: Straightening warped pieces?

I've finally convinced myself I can build an RV-10, and have received my tailcone kit this week.



I finished inventory, then started looking at the pieces for the vertical stabilizer.  I noticed that the VS-1008 rear spar doubler and VS-1014 L+R rear spar caps were both somewhat warped.  The warp in the spar caps is mentioned in the plans, where they say to clamp it down to avoid the warp -- but there is no mention of a warp in the spar doubler.  It bows up about 3/16" when I lay it on a flat table.

 



It looks like the warp is caused by the punching process.  I can flatten it out by clamping it down to the spar, but worry that building a plane with internal static stress is not the Right Thing To Do.

 



Should I be worried about this and try to remove the warp?  Or should I just rely on the fact that it flattens out when I cleco it to the spar?

Or, phrased differently:  how much warp in a part pre-assembly is "too much"?

 



Chris

(still working through questions which I suspect are old hat to all of you...)

  [quote][b]

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Fri Feb 12, 2010 4:27 am Post subject: Straightening warped pieces?

I don't know how much is too much, but yeah, that's how those

parts come.  They'll be fine.  You can flatten them out

if you try.  I wouldn't stress too much over it...If you

can flatten them so the holes match, it'll all be ok.



Tim Olson - RV-10 N104CD

do not archive

Chris Colohan wrote:

 	  Quote: 	
		   I've finally convinced myself I can build an RV-10, and have received my 

 tailcone kit this week.

 

 I finished inventory, then started looking at the pieces for the 

 vertical stabilizer.  I noticed that the VS-1008 rear spar doubler 

 and VS-1014 L+R rear spar caps were both somewhat warped.  The warp in 

 the spar caps is mentioned in the plans, where they say to clamp it down 

 to avoid the warp -- but there is no mention of a warp in the spar 

 doubler.  It bows up about 3/16" when I lay it on a flat table.

 

 It looks like the warp is caused by the punching process.  I can flatten 

 it out by clamping it down to the spar, but worry that building a plane 

 with internal static stress is not the Right Thing To Do.

 

 Should I be worried about this and try to remove the warp?  Or should I 

 just rely on the fact that it flattens out when I cleco it to the spar?

 

 Or, phrased differently:  how much warp in a part pre-assembly is "too 

 much"?

 

 Chris

 

 (still working through questions which I suspect are old hat to all of 

 you...)

 

 *

 

 

 *

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davidsoutpost(at)comcast.
Guest

Posted: Fri Feb 12, 2010 6:46 am Post subject: Straightening warped pieces?

I straightened my warped pieces on the edge of the work bench.  Don't overdo it trying to get them perfect.  De-burr the edges and holes and it all pulls together when you cleco it together.  



David Clifford



RV-10 In Progress

Empennage Done

Engine Overhauled & Pickled

Closing up The Wings  



---

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ogdenk

Joined: 05 Feb 2007
Posts: 41
Location: Syracuse, NY

Posted: Fri Feb 12, 2010 9:04 am Post subject: Straightening warped pieces?

You will have to deal with this issue when you get to the F-1011C Horizontal Stab attach bars, they are also warped from the stamping process.  You will need to put them in a vice (I padded the jaws with leftover pieces of J-stiffener which eliminated scratches quite well) and gently bash them with a rubber mallet to straighten them out.  I am seeing the same issue right now with the aileron bracket spacers, they have a bend that won't straighten when clecoed together with the other bracket parts, which are much thinner and curve to match the spacer.  I think I will straighten them as well.

  

 Kent Ogden

  

 #40710 Wings



 	  Quote: 	
		  >> <davidsoutpost(at)comcast.net> 2/12/2010 9:42 AM >>>


	


 I straightened my warped pieces on the edge of the work bench.  Don't overdo it trying to get them perfect.  De-burr the edges and holes and it all pulls together when you cleco it together.  



David Clifford



RV-10 In Progress

Empennage Done

Engine Overhauled & Pickled

Closing up The Wings  



---

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Fri Feb 12, 2010 8:50 pm Post subject: Re: Straightening warped pieces?

Keep pressure applied to the piece in the direction you want to bend then use deadblow hammer and hit within an inch or two of the vise or table that it is clamped to. Then move piece in vise or on table an inch or two at a time until it is straight. You will use this method as I did on the 8' tailcone longerons to put a 2 degree bend in them. Of course you will only hit in one place. Works well.

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Wayne G.

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