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Posted by Jim Wilkins on July 24, 2008, 4:48 pm
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> mfranc...@tx.rr.com wrote:
> > I need to bend some 6061T6 .040 aluminum that is a U shape, 8" wide
> > with 2" legs. I wanted to know if I mark exactly the 8" and make the
> > bend will the radius cause the overall width to be less or more than
> > the 8". I dont want to waste material by trying to bend 8" width and
> > then the overall width is either 7 7/8" or 8 1/8", any suggestions?
> > Thanks,
> > Mike
>
> Have you done a test bend on a piece of scrap from the same batch? =A0It
> probably will bend OK if you leave the brake clamp back a bit to make a
> wider bend. =A0If the test DOES crack, you need to wipe soap on the bend
> line and heat with a torch until the soap turns brown, then quench in
> lots of water while still hot. =A0This anneals the aluminum at the bend
> region, and should allow much easier bending without cracking.
>
> Others have answered the bend allowance part of your question.
>
> Jon
Another way is to cut and bend a narrow strip and pad the clamp jaw
with it to increase the bend radius. This usually works with 0.062"
6061-T6 in either direction (yes, it has a grain).
5052 bends better.
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> with 2" legs. I wanted to know if I mark exactly the 8" and make the
> bend will the radius cause the overall width to be less or more than
> the 8". I dont want to waste material by trying to bend 8" width and
> then the overall width is either 7 7/8" or 8 1/8", any suggestions?
> Thanks,
> Mike