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  #1  
Old 12-08-2014, 05:36 PM
HeliCooper HeliCooper is offline
 
Join Date: Jun 2013
Location: Des Moines, IA
Posts: 256
Default Nose rib fluting

I am running into this while trying to flute the nose ribs. The first two pictures show what the rib looks like after fluting without an pressure. You can see there is a pressure forming a twist in the rib.





If I hold pressure on the rib you can see that the flange itself is straight on both sides. Pressure is very light. Guessing just a pound or so.



Also of note in this picture you see the gap under my thumb between the flange and the table. This gap is present on all the ribs before fluting and as far as I can tell is not correctable.

Should I just leave them fluted like this or do I need to figure out how to get that load off the rib?
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  #2  
Old 12-08-2014, 06:11 PM
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wirejock wirejock is offline
 
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Default Fluting

On my 7a, I was able to work them until they lay flat on the web side but I was more concerned with getting the holes to line up with a straight edge. I remember it took a long time. The flange edge is not perfectly flat. I doubt you will be able to get it flat using that side.
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  #3  
Old 12-08-2014, 06:32 PM
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Tilford Tilford is offline
 
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Default

I was recently reading about this very thing in section 5.13 Fluting, and remember this note.

"NOTE: Do not confuse the twist in a part with a curved flange. It is normal for light pressure to be required to hold a twisted part flat on a table. Fluting does not remove twist from a part."

Also, I found this page helpful in regards to fluting. Looks like the images are no longer available, but the explanation is still good.
http://www.vansairforce.com/communit...70&postcount=1
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  #4  
Old 12-08-2014, 06:53 PM
Tom Martin Tom Martin is offline
 
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Location: Ontario, Canada
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Lay the part on a flat surface with the flanges up.
Get on your knees, eyes level with the part
Hold the flange down to the table and see if it needs fluting, do not worry about the other side
Only do one section of a flange at a time if there is a notch in the flange
If there is a bend in the part then lightly flute between each rivet hole
Check for straight, if the section of flange lays flat, job done
If not, flute some more

I could have done three ribs in the time it took to type this, try not to over think it. If the part lies flat on the table the holes will be in line as well
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  #5  
Old 12-08-2014, 07:14 PM
aerhed aerhed is offline
 
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Look close and you'll see the flanges get wider through the curved areas from the forming process. Disregard that and use the web side edge for referencing.
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  #6  
Old 12-09-2014, 11:23 AM
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longranger longranger is offline
 
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I used the factory edge of my MDF benchtop as a reference for fluting. Much more comfortable (and in my case, more accurate) than fluting while using the benchtop while on my knees.

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  #7  
Old 12-09-2014, 03:27 PM
HeliCooper HeliCooper is offline
 
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Thanks for the help guys. I don't know where I got using the flange side. Using the web side worked great.
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  #8  
Old 12-09-2014, 03:30 PM
Stockmanreef Stockmanreef is offline
 
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One other thing that I do when I flute parts is to put frog tape down on the rib right next to the flange (sometimes partial on the inside flange) prior to fluting. This helps in case your fluting tool slides down to the surface of the part as you squeeze. prevents marring the skin.
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  #9  
Old 12-09-2014, 04:36 PM
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longranger longranger is offline
 
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Quote:
Originally Posted by Stockmanreef View Post
One other thing that I do when I flute parts is to put frog tape down on the rib right next to the flange (sometimes partial on the inside flange) prior to fluting. This helps in case your fluting tool slides down to the surface of the part as you squeeze. prevents marring the skin.
I wrap each jaw of the fluting pliers, including the nose, with a layer of duct tape for the same purpose.
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  #10  
Old 12-10-2014, 12:22 PM
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JonJay JonJay is offline
 
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From the pic, it appears you are over fluting. You can take your fluting pliers and gently reduce the amount of gather on the side that is compressing (flatten the flute a bit). Should straighten right out, or get relatively close.

Flute gently, and space them out. Come back and put in intermediary flutes if necessary or deepen the flute to gather more material. You may find some ribs need very little while others need more.
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