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Basic Fluting Question

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william(at)gbta.net
Guest

Posted: Thu Jan 13, 2011 2:05 pm Post subject: Basic Fluting Question

Hey everyone.  I'm having an issue with fluting  some ribs.  Some of my ribs have a "spring" or twist to them caused by  stamping them out (I assume).  I cannot seem to get the "spring" out of the  ribs by fluting them--no matter what I try.  If I apply light pressure to  the rib while on a table they lie flat but the instant I let go they spring  right back so they are twisted.  Am I doing something wrong???  My  fluting does get the rivet holes lined up good when the ribs lie flat on the  table.  I've had a few in the past like this that I just installed and the  clecoes very easily pull the rib into place.  Is this acceptable?  If  not, how do I correct.  I've attached a few pictures to better describe my  issue.

  

 Thanks in advance,

 Bill (Feels like I'm going backwards)  Britton

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jcumins(at)jcis.net
Guest

Posted: Thu Jan 13, 2011 2:37 pm Post subject: Basic Fluting Question

Bill

 

We are in about the same spot in construction.  What I did was use a straight edge down the ribs and fluted to make the rib straight and not curved like they are coming from Vans.  The twist issue I do not think you can fix, but the curve can be fluted away.

 

Good luck.  

 

John   

40864 Wings  Wanting good weather so I can primer more parts.



 

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Billy & Tami Britton

Sent: Thursday, January 13, 2011 1:06 PM

To: rv10-list(at)matronics.com

Subject: Basic Fluting Question

 

Hey everyone.  I'm having an issue with fluting some ribs.  Some of my ribs have a "spring" or twist to them caused by stamping them out (I assume).  I cannot seem to get the "spring" out of the ribs by fluting them--no matter what I try.  If I apply light pressure to the rib while on a table they lie flat but the instant I let go they spring right back so they are twisted.  Am I doing something wrong???  My fluting does get the rivet holes lined up good when the ribs lie flat on the table.  I've had a few in the past like this that I just installed and the clecoes very easily pull the rib into place.  Is this acceptable?  If not, how do I correct.  I've attached a few pictures to better describe my issue.



 



Thanks in advance,



Bill (Feels like I'm going backwards) Britton



  [quote][b]

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Thu Jan 13, 2011 2:42 pm Post subject: Basic Fluting Question

If they stand up that much, I'd flute them and make them flatter.

I'm sure it could be fine if you installed them, but really,

the idea is to get that stress out of them and make them flat.

There is a technique to it, and it's easier to do or show

than speak, but once you get the hang of it, you'll have it

down.  It's been a LOOONG time, but I think that the one you

have the picture of in this email probably is over-fluted,

and that's why it's bowed up.  If you flute less, the length

of the bottom edge would be longer, and it would tend to

make it flatter. Picture it as a bar that you want to bend,

and if you flute one side, it bends that way.  Well, you

fluted the side facing down, and when you got to a certain

point, the thing bent in a curve facing that direction.

So I'd relax the flutes and see what happens.



You'll get the hang of it.

Tim

Tim Olson - RV-10 N104CD

do not archive

On 1/13/2011 3:05 PM, Billy & Tami Britton wrote:

 	  Quote: 	
		   Hey everyone. I'm having an issue with fluting some ribs. Some of my

 ribs have a "spring" or twist to them caused by stamping them out (I

 assume). I cannot seem to get the "spring" out of the ribs by fluting

 them--no matter what I try. If I apply light pressure to the rib while

 on a table they lie flat but the instant I let go they spring right back

 so they are twisted. Am I doing something wrong??? My fluting does get

 the rivet holes lined up good when the ribs lie flat on the table. I've

 had a few in the past like this that I just installed and the clecoes

 very easily pull the rib into place. Is this acceptable? If not, how do

 I correct. I've attached a few pictures to better describe my issue.

 Thanks in advance,

 Bill (Feels like I'm going backwards) Britton

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rv6(at)att.net
Guest

Posted: Thu Jan 13, 2011 6:40 pm Post subject: Basic Fluting Question

With some work, they will lay fairly flat.  I prefer pliers like in the

attached file that makes a thinner flute.  Pliers with wide flutes didn't

work well for me.  Lay the rib on a flat surface with the rib flanges

pointing up. I pick the side of the rib that doesn't want to lie down and I

very lightly flute that section starting in the middle working back and

forth to each end of rib.  Press down slightly on the web as you do this. It

should start laying down.  I also work the ribs by hand by bending and

twisting a little.  Once the rib lays as flat as you feel it's going to, the

flanges are checked to make sure they are close to 90 degrees to the web so

the skin fits flush to the flange.



Just watch how the rib reacts to fluting and flute lightly.  Some flutes

will need additional fluting.  Some flutes may be fluted too much and seamer

pliers (see attached file) can be used to squeeze out some of the fluting.



Once you get the hang of it, it gets easier.



Jerry Calvert

RV6

N296JC



On 1/13/2011 3:05 PM, Billy & Tami Britton wrote:

 	  Quote: 	
		   Hey everyone. I'm having an issue with fluting some ribs. Some of my

 ribs have a "spring" or twist to them caused by stamping them out (I

 assume). I cannot seem to get the "spring" out of the ribs by fluting

 them--no matter what I try. If I apply light pressure to the rib while

 on a table they lie flat but the instant I let go they spring right back

 so they are twisted. Am I doing something wrong??? My fluting does get

 the rivet holes lined up good when the ribs lie flat on the table. I've

 had a few in the past like this that I just installed and the clecoes

 very easily pull the rib into place. Is this acceptable? If not, how do

 I correct. I've attached a few pictures to better describe my issue.

 Thanks in advance,

 Bill (Feels like I'm going backwards) Britton

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Mauledriver(at)nc.rr.com
Guest

Posted: Fri Jan 14, 2011 8:48 am Post subject: Basic Fluting Question

First, I just want to say that when I first managed to flute the ribs on 

the elevator counterweight  ribs, I felt like a sheet metal Jedi 

Master.  Getting them to lie flat was very cool.

However, later I found that my 2 elevator ribs were not exactly aligned 

with each other.  That is, when I lined up my elevator trailing edges, 

the counterweight extensions weren't quite aligned.  And vice-a-versa.  

It was one of the few places that CNC drilled holes didn't bring things 

into perfect alignment.  Must have been that master fluting job.

Actually, I don't know what happened.  It's not enough to worry about in 

my opinion but I found it frustrating.  Can't imagine that the fluting 

of the wing ribs would possibly be as critical.  Hang in there though.  

I used 2 different fluting pliers and found that both had utility though 

I'm sure the job can be done with 1.

No advice, just reflection...

Bill Watson

On 1/13/2011 5:38 PM, Tim Olson wrote:

 	  Quote: 	

 If they stand up that much, I'd flute them and make them flatter.

 I'm sure it could be fine if you installed them, but really,

 the idea is to get that stress out of them and make them flat.

 There is a technique to it, and it's easier to do or show

 than speak, but once you get the hang of it, you'll have it

 down.  It's been a LOOONG time, but I think that the one you

 have the picture of in this email probably is over-fluted,

 and that's why it's bowed up.  If you flute less, the length

 of the bottom edge would be longer, and it would tend to

 make it flatter. Picture it as a bar that you want to bend,

 and if you flute one side, it bends that way.  Well, you

 fluted the side facing down, and when you got to a certain

 point, the thing bent in a curve facing that direction.

 So I'd relax the flutes and see what happens.

 You'll get the hang of it.

 Tim

 Tim Olson - RV-10 N104CD

 do not archive

 On 1/13/2011 3:05 PM, Billy & Tami Britton wrote:

> Hey everyone. I'm having an issue with fluting some ribs. Some of my

> ribs have a "spring" or twist to them caused by stamping them out (I

> assume). I cannot seem to get the "spring" out of the ribs by fluting

> them--no matter what I try. If I apply light pressure to the rib while

> on a table they lie flat but the instant I let go they spring right back

> so they are twisted. Am I doing something wrong??? My fluting does get

> the rivet holes lined up good when the ribs lie flat on the table. I've

> had a few in the past like this that I just installed and the clecoes

> very easily pull the rib into place. Is this acceptable? If not, how do

> I correct. I've attached a few pictures to better describe my issue.

> Thanks in advance,

> Bill (Feels like I'm going backwards) Britton

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rv10flyer

Joined: 25 Aug 2009
Posts: 364

Posted: Fri Jan 14, 2011 8:57 pm Post subject: Re: Basic Fluting Question

I found lining up a flexible 24" steel rule with the hole edges to work the best. The edge distance always varies due to the holes being punched then the rib forming. By lying them on a table you may get a straight sheetmetal edge but not a straight set of holes. The pre-punched skin holes are in a straight line so you want to have the holes in the ribs in a straight line not the edge of the metal flange. I just did a little at a time and if I overdid it just went back and took some out. After a few ribs you know just how much force to use and where.

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_________________
Wayne G.

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