well you gonna need prettys soft alum or its gonna shear instead of bend and crack instead of compress. You will need all corners polished like mirrors and some kind of lubricant. The lips will need to compress and become thicker at as it comes up compresses. cracking from compression is always a problem especially with tough aluminum.
But I am no expert, just a few trials and then no more.
And as far as tonnage, 10 tons should be more than suffiecient for soft aluminum.
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Irnsrgn
Knowledge must be shared or it lies dead in the mind.
The Blacksmith must use Hammer and Flame to force the iron down the path of his own choosing.
I usually find it much easier to be wrong once in while than to try to be perfect.
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