Okay, so I had a Legendary +2 Weaponsmith go Withdraw from Society, and I was all "Wooo!"
She started bellowing for metal bars, stacked leather, wood, bone, and cut gems, and I was all "Oh yeah, this is gonna be hella awesome!"
I locked the doors to all of the magma forges except the one in her room (I treat the really useful dwarves like nobles want to be treated,) so she claimed her own forge, forbade everything but steel, and ordered stockpiles built up around her of all the stuff she wanted.
She would not start grabbing items. I was about to go spare when I saw from the Strange Mood page that Moody smiths will sometimes demand specific metals, aggravatingly. I checked her preferences: she wanted PLATINUM!
I had precisely two platinum bars in the whole fortress. one of them was constructing the forge in her office, the other was constructing my Forgemaster's (a friend asked to be dorfed, I gave him the guy with the highest smithy skill) office forge.
Nothing to it. I deconstructed the Forgemaster's forge, she claimed it, and everything else went like clockwork. Here's what she's using:
Platinum Bar
Elephant leather
Bauxite block
Red diamond
Fungiwood log
Elephant leather
Green diamonds
Gronckle bone (yay for Dragon Flavor!)
I'm pissed she demanded a useless nonweapon precious metal instead of partaking of some of that lovely steel, but it'll be completely forgiven if she makes a hammer or mace. I'll post an update when it's done.