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23a:Melt item

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This article is about an older version of DF.

You can melt items at a smelter, using the furnace operator labor, to recover some of the metal they were made of. The % return is predictable and consistent for each item type, and ranges from 10%-100%, depending on the item. Higher skill levels in furnace operator speed up the process, but have no effect on the % return.

Recovered metal is measured in tenths of a bar, and these 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 tenths 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.

Example: If two items of the same metal worth 0.4 bars each are melted at the same smelter, that smelter has 0.8 bars worth waiting in it.
If a similar item of a different metal is then melted there, that smelter would have 0.8 bars of the first metal and 0.4 bars of the second.
If a similar item of the first metal is then melted at a different smelter, that smelter will have 0.4 of that metal, and have no connection to the fractions in the first smelter.
If (finally!), a 3rd, similar item of the first metal is melted at the first smelter, adding another 0.4, and giving a total of 1.2 of that type of metal, 1 bar of that metal is produced, leaving 0.2 inside the smelter (plus the 0.4 of the second metal).

So, it's recommended that you designate one smelter as your "melting" smelter (or one/metal type), to guarantee that fractions will add up effectively.

Due to a bug, decorated items will not be melted.

Contents

[edit] Designating items to melt

You can designate metal items for melting from the Stocks page once the Bookkeeper arrives.

To designate the item, simply type m to mark the object for melting. If the item is designated for chasming, it will be automatically unmarked.

However, this only marks which items you want to be melted - you still have to place the job-order in a smelter...

[edit] Melting the items

Items designated to be melted will be left alone until you queue a "Melt a metal object" job at a Smelter or Magma smelter. Melting down an object requires the Furnace operator labor (and consumes a unit of fuel for a non-magma smelter).

The job gives the same experience to the furnace operator skill regardless of % yield of the item melted.

[edit] Yield

The type of item being melted (and its stack size) determines how many bars of metal will be recovered. Melting objects generally nets you fewer bars of metal than were required to make them, although for some objects this loss is much greater than for others. Some metal items are otherwise refuse, so melting is a distinct option. An entire suit of chain armor, including shield, consumes 7 bars to make - melted it yields only 3.3.

Melting yields do not respect MATERIAL_SIZE for armor items - regardless of how many bars are used to make the item, the yield will be the same.

Items yielding 1 full bar:

Items yielding 0.8 bars:

Items yielding 0.5 bars:

Items yielding 0.3 bars:

Items yielding 0.2 bars:

Items yielding 0.1 bars:

Special:

  • Ammo yields 0.1 bars per 10 units, rounded down, plus 0.1. A stack of 1-9 bolts will yield 0.1 bars, 10-19 will yield 0.2 bars, etc. - a freshly smithed stack of 25 bolts will yield 0.3 bars, for a 30% return.
  • Coins yield 0.1 bars per 50 units, rounded down, plus 0.1. A stack of 1-49 coins will yield 0.1 bars, 50-99 will yield 0.2 bars, etc. - a freshly minted stack of 500 coins will yield 1.1 bars, for a 110% return.

[edit] Training metalsmith skills / Maximizing return

It can consume many, many bars of metal to train the various metalsmithing skills up to high levels*, likely more than you will ever find within the mountain. If you are short on metal, producing items, melting them and re-producing them may be necessary. If you want to retain as much metal as possible from this process, some items are better to produce and re-melt than others. The skill to be trained in the chart below is trained at a forge; melting items at a smelter only raises the furnace operator skill. When using a produce/melt loop to train up a skill for a minimum metal loss, the following items work best:

(* 600 bars to train from Dabbling to Legendary, and 367 more to reach Legendary+5, the highest skill level)
Skill
to be
Trained
Best
Percent
Return
Recommended
Item(s)
Melted
weaponsmith 50% weapons
armorsmith 60% gauntlets, high boots, or low boots
metalsmith 100% bucket
metal crafter 110% coins
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