Ian,
You can use a radius inside bend instead of a sharp 90, use a soft aluminum, or
use a bottoming die which holds pressure on the outside. The bottoming die wont
do you any good though on a pan/box break, just V-dies types. Sharp 90 deg
bends is a major cause in brittle types of aluminum. A 1/8" radius will help a
good bit. To do this in a break, you have to add a shoe over the fingers on a
pan break, or a radiused punch on a V brake. Anytime you see that cracking,
it's because your using too sharp of a bend for the material. That's the only
ways I know to do it.
Best,
Will
*********** REPLY SEPARATOR ***********
On 8/4/05 at 8:11 AM Ian White G/GM3SEK wrote:
>N7KA wrote:
>>Someone asked about bend allowance for sheet metal. If needed contact
>>me off line as I have info needed to do calcs from work. We de do a
>>LOT of sheet metal fab work and forming is ongoing continuous process
>>for us (mostly aluminum up to .25 inch).
>
>Staying on-line... what's the trick to prevent alumin(i)um from
>splitting on the outside edge of a bend where it is stretched?
>
>
>--
>73 from Ian G/GM3SEK 'In Practice' columnist for RadCom (RSGB)
>http://www.ifwtech.co.uk/g3sek
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