***I honestly have no idea how fractions of a bar of metal work when melting items down, so I am wary of recommending that activity.
I can answer that one.
If you use a single smelter to melt down everything then fractional bars, of each metal, build up separately and you get an extra real bar produced when enough partial bars have been saved up.
e.g. If you get 1.5 bars per object melted then the first object returns 1 bar. The second returns 2 bars.
If you get 1/3 of a bar per object then you get nothing for the first two objects melted, then 1 bar for the third.
An easy, an profitable, way of training up weaponsmithing is to continually forge then melt down enormous steel corkscrews. Melt down everything that is less than masterwork, and keep the masterwork items to sell.
Of course that is really an exploit on two levels. Trading, and melting, are both rather unbalanced.
Thank you. That question had confounded me for a while now, though I'm not sure why I didn't really look for an answer.
I now see here on the wiki is the relevant text:Recovered metal is measured in 1/10th's, and 1/10ths of bars of each metal are saved at the smelter where the item was melted. Fractional bars are not "shared" between smelters, nor do they exist as usable objects as is. When 10/10ths of a type of metal are accumulated at the same smelter, 1 bar of that metal is produced. If the smelter is torn down or destroyed, all fractions are lost.
I was turning out tons of metal (whatever I ore I have most of; usually iron or copper) crossbow bolts
to train weaponsmiths before setting them to make steel weapons.
Which, while somewhat useful, is still pretty time/resource intensive even if you have tons of fuel stones (
bit. coal / lignite).
Time is one of the most deadly enemies of a well equipped/trained military in my experience,
since often that annoying wild animal, undead thing, were-creature or raid arrives before expected.
Additionally, like wobbly said in the post above,
I too have found that to minimize death/injury, having just one dwarf with SOME military skills
is far better than sending 30 dabbling or untrained dwarfs out
to fight that single non-undead creature which threatens,
since all it takes is one good swipe to lop a head off, and a dwarf with a shield plus some armor is relatively protected,
even with novice military skills, against say, a were-monitor/panther.
While your untrained/ill-equipped dwarfs will just get butchered.
For example:
I have, in response to an unexpected hostile entity, on occasion torn my tediously sorted 30-dwarf-early-game-militia apart,
and compressed it into a single squad of dwarfs who have some military skills
(weapon skill of novice or above generally at a minimum), and who have then a better chance at being properly equipped...
just to deal with the present menace with a vastly smaller chance at casualties.