Well, assuming you bent to size, how far back did they spring - how much too
wide are the legs now? Just bend that much further past straight, and they
should spring back basically to size. You can calculate and predict all you
want based on book properties, but in the end you bend and check and tweak
even with a cnc brake :-). Oh, it would be best to make the radius of your
form a little under, too.

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Regards,
Carl Ijames
"Meanie" wrote in message ...

On 7/12/2014 1:08 PM, wrote:
On Sat, 12 Jul 2014 11:21:56 -0400, Meanie
wrote:

A few weeks ago I asked about bending a 2" wide x 1/4" thick x 3' length
flat stock 6061 aluminum bar into a U shape with a 7" radius. I was
concerned about the bar springing back and thus did an experiment. I
made a die using wood to form my radius.
https://www.flickr.com/photos/18223943@N06/14635585195/ and tested a
piece of 1/8" thick aluminum bar.
https://www.flickr.com/photos/182239...n/photostream/
Though, I realize the 1/8" bar is more resilient than the 1/4", the
concern of springing back presents itself as you can see
https://www.flickr.com/photos/182239...n/photostream/

Therefore, what are the possibilities of the 1/4" bar springing back and
what can I do to prevent this? Heat? It's important the bar retains it's
shape after bending.

Thank you
Calculate the springback and overbend, like any metal-worker would do

That's the problem, I'm not a metal worker nor know how to calculate for
overbend. I suppose I'll ask Google.