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  #11  
Old 10-02-2016, 05:30 PM
Polar Polar is offline
 
Join Date: Oct 2013
Location: Central Alberta
Posts: 63
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Quote:
Originally Posted by mrhorspwr View Post
Just cleco it up and shoot it!
I would if the holes lined up!
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  #12  
Old 10-03-2016, 06:59 AM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,456
Default

Dimpling it will lock in the shape to some extent, making it harder to straighten. It doesn't look that bad. You can't force it into position 1 cleco at a time?
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Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
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  #13  
Old 10-03-2016, 07:25 AM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
Default Get going - do something

Quote:
Originally Posted by Polar View Post
This part actually comes dimpled from vans, which probably added to the deformation. I put a couple of flutes into the flange, and then flattened the flute back out, trying to stretch the flange and push the end back down. It didn't move much though, and I didn't want to repeat that process for fear of cracking.
Either it will or won't. Posting won't fix it and if it is not fixed you won't assemble it. Get going!! Take a 3/4 wide strip of material and squeeze it centered 1/3 across along one side. Measure the change in straightness. Settle on a plan, then squeeze to extreme and see if it cracks.

I don't think the part is 2024, but if it is, it is already dimpled bent and holes punched in it. It is not THAT brittle. Likely 6061 with T6 after bending - even less prone to brittle failure.

It is easy to paint yourself in an imaginary corner, and just as easy to imagine a way out. Make the project true to its heritage - experimental - so experiment. Do something -if it breaks , do something else.
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Bill

RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #14  
Old 10-03-2016, 04:56 PM
Polar Polar is offline
 
Join Date: Oct 2013
Location: Central Alberta
Posts: 63
Default Time to do something else

Well, it was going ok until it wasn't.

I was close, but it cracked.



I was slowly squeezing small flutes, then tapping it back flat. The top of my welding table is 3/8" plate, so I was squeezing the tip of the rib on to the corner of the table (which barely fit between the flanges) and tapping the flutes flat.



It was going ok, slowly, and I was trying to keep the flutes from overlapping, but eventually there was a very definite pop. The crack runs right down into the radiused inside corner, so it's now scrap. Oh well, I ordered 2 extras, just in case.

I carried on and got it reasonably flat without further cracks, so the process works. I'll just have to go a bit slower next time.

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  #15  
Old 10-03-2016, 05:12 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 5,516
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Sorry to see a failure. Curious, Cody, why did you flute it then bang it back out? It needed to be stretched, but don't see any reason to bend it (flute) first. Hammers are good ,but the part will assume the surface finish of the hammer and anvil. I think the fluting was the base cause of the cracking. Either hammer/dolly or squeezing will compress and stretch the edge slightly and curve the part back straight.
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Bill

RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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  #16  
Old 10-03-2016, 07:11 PM
Polar Polar is offline
 
Join Date: Oct 2013
Location: Central Alberta
Posts: 63
Default

The jaws on the fluting pliers look identical to the anvils on a power hammer, or a pullmax. Squeezing material around the corners of the jaw IS stretching it. I used a squeezer near the middle of the rib, but closer to the point of the part the yoke wouldn't fit between the two flanges. The fluting pliers would though.
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  #17  
Old 10-04-2016, 06:37 AM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,456
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Fluting and then hammering it out is asking too much of that alloy and temper. You can bend it once without cracking but that's about it.
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Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
Instagram @sblack2154
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