Make a blast furnace at a crafting table with 5 iron ingots, 1 furnace, and 3 smooth stone. Place the three iron ingots across the top row, put an iron ingot in each side slot of the middle row with the furnace in the center, and place the three smooth stone across the bottom row. The result is a blast furnace that smelts eligible ores, raw metals, ancient debris, and metal equipment in 100 game ticks (5 seconds) per item—half the time of a regular furnace—while using fuel at the same rate.
What do I need to make a blast furnace?
You need three ingredients before opening the crafting table:
| Ingredient | Quantity | How to obtain it |
|---|---|---|
| Iron ingot | 5 | Smelt iron ore, deepslate iron ore, or raw iron in a furnace. |
| Furnace | 1 | Craft one from eight cobblestone, cobbled deepslate, or blackstone in the usual ring pattern. |
| Smooth stone | 3 | Smelt cobblestone into stone, then smelt the stone again into smooth stone. |
The iron and furnace are straightforward, but smooth stone is the ingredient most often mistaken for ordinary stone. A stone block made in the first smelting pass will not substitute for smooth stone in the blast-furnace recipe.
How do I get the five iron ingots?
Place iron ore, deepslate iron ore, or raw iron in a regular furnace and smelt it. Collect five finished iron ingots. The blast furnace itself is not needed for this preparation step, so an ordinary furnace can produce the ingots required to craft your first blast furnace.
How do I craft the furnace ingredient?
Use a crafting table and fill the outer eight positions of the 3×3 grid with cobblestone, cobbled deepslate, or blackstone, leaving the center empty. That ring produces the single furnace needed in the blast-furnace recipe. If you already have a furnace, you can use it directly as the middle ingredient rather than crafting another one.
How do I make smooth stone for the recipe?
Smooth stone takes two smelting passes. First turn cobblestone into stone; then put the resulting stone through the furnace a second time to turn it into smooth stone. Three finished smooth stone therefore require six smelting operations starting from cobblestone: three operations to make stone and three more to polish that stone into smooth stone.
- Put cobblestone in a regular furnace and smelt it into stone.
- Collect the stone when the first pass finishes.
- Load the stone back into the furnace for a second pass.
- Repeat until you have three smooth stone.
Keep the two outputs separate while preparing the materials. The first pass produces stone, not smooth stone, so moving the first output directly into the crafting table will leave the recipe incomplete. The blast furnace recipe checks for the finished smooth-stone item.
What is the exact blast-furnace crafting layout?
Open a crafting table and use this 3×3 arrangement:
| Top row | Middle row | Bottom row |
|---|---|---|
| Iron ingot | Iron ingot | Iron ingot |
| Iron ingot | Furnace | Iron ingot |
| Smooth stone | Smooth stone | Smooth stone |
In a grid view, the pattern is:
| Iron | Iron | Iron |
| Iron | Furnace | Iron |
| Smooth stone | Smooth stone | Smooth stone |
- Place an iron ingot in each of the three top-row slots.
- Place one iron ingot in the left-middle slot and one in the right-middle slot.
- Put the furnace in the center slot.
- Fill all three bottom-row slots with smooth stone.
- Take the blast furnace from the result slot.
The recipe is shaped, so the positions matter. Five iron ingots scattered around the grid, stone instead of smooth stone, or a furnace placed outside the center will not produce the intended result.
Why will my blast-furnace recipe not work?
Check the grid from the center outward. Most failed crafts come from using the right materials in the wrong form or putting them in the wrong positions.
- Using a 2×2 inventory grid: The recipe needs the full 3×3 grid of a crafting table.
- Using stone instead of smooth stone: Smelt stone a second time. The bottom row must contain three smooth stone.
- Missing an iron ingot: Count five total—three across the top and two beside the center furnace.
- Putting the furnace in the wrong slot: It belongs in the exact center of the grid.
- Using the wrong furnace ingredient: The recipe requires one completed furnace, not a blast furnace or an empty crafting slot.
- Using a different stone material in the bottom row: The three bottom slots are specifically for smooth stone.
If the result slot remains empty, remove the ingredients and rebuild the pattern one row at a time. Confirm the three smooth stone are finished items before replacing the iron and furnace.
What can a blast furnace smelt?
A blast furnace is a specialist metal-processing block. It accepts ores, raw metals, ancient debris, and metal tools, weapons, or armor. It does not cook food and does not process ordinary non-metal items such as sand, cobblestone, logs, or cactus.
| Input category | Blast furnace result | What to use instead when it is not accepted |
|---|---|---|
| Ores | Accepted | — |
| Raw metals | Accepted | — |
| Ancient debris | Accepted | — |
| Metal tools, weapons, and armor | Accepted | — |
| Food | Not accepted | Use a smoker. |
| Sand, cobblestone, logs, cactus, and other ordinary non-metal items | Not accepted | Use a regular furnace when the item is a general smelting input. |
Its speed advantage applies only to eligible inputs. Loading an item that belongs in a smoker or regular furnace does not turn the blast furnace into a general-purpose cooker.
How fast is a blast furnace compared with other furnaces?
For an eligible item, a blast furnace takes 100 game ticks, or 5 seconds. A regular furnace takes 200 game ticks, or 10 seconds, for its smelting cycle. Fuel consumption remains the same, so the blast furnace saves processing time rather than fuel.
| Block | Primary input category | Processing time per accepted item | Acceptance limits |
|---|---|---|---|
| Blast furnace | Ores, raw metals, ancient debris, and metal equipment | 100 game ticks (5 seconds) | Does not cook food or ordinary non-metal items. |
| Smoker | Food | 100 game ticks (5 seconds) | Designed for food rather than metal inputs. |
| Regular furnace | General-purpose smelting | 200 game ticks (10 seconds) | Use it for items that the specialist blocks do not accept. |
Choose by input rather than by speed alone. A smoker matches the blast furnace’s five-second timing for food, while a regular furnace remains the correct choice for general materials. The blast furnace’s advantage appears when your queue consists of the metal and equipment categories it accepts.
How do I automate a blast furnace with hoppers?
Hoppers can supply the three parts of the process without hand-loading every item. The standard arrangement is one hopper above for smeltable input, one hopper on the side for fuel, and one hopper underneath to collect finished output.
- Place the blast furnace where you want the processing station.
- Connect a hopper above it to feed eligible ores, raw metals, ancient debris, or metal equipment.
- Attach a side hopper to supply fuel.
- Place a hopper below the blast furnace to collect the output.
- Put storage containers where the input, fuel, and output hoppers can draw from or deposit into them.
Keep the flows assigned to the correct sides: the upper hopper is for the material being processed, the side hopper is for fuel, and the bottom hopper is for the finished result. If a line appears stalled, check that its hopper is connected to the intended face and that the corresponding container has the right category of item.
What villager job uses a blast furnace?
The blast furnace is the Armorer villager’s job-site block. In a settlement using villager professions, placing one can provide the block associated with that profession. This role is separate from the blast furnace’s smelting function: the block can process metal items whether or not a villager is nearby.
When should I use a blast furnace instead of a regular furnace?
Use the blast furnace when your queue is made up of accepted metal inputs and you want each item finished in 5 seconds. Use a regular furnace when the material is general-purpose or not accepted by the blast furnace, and use a smoker for food.
- Mining session: Route iron ore, deepslate iron ore, raw iron, and other accepted metal inputs to the blast furnace.
- Equipment cleanup: Metal tools, weapons, and armor belong in the blast furnace category described above.
- Building materials: Keep sand, cobblestone, logs, cactus, and similar non-metal inputs in a regular-furnace workflow when they need smelting.
- Food preparation: Send food to a smoker rather than trying to use the blast furnace.
Because fuel use is unchanged, replacing every furnace with a blast furnace is not automatically better. The useful upgrade is faster eligible processing; the regular furnace still covers materials outside the blast furnace’s accepted list.
Blast furnace recipe FAQ
How much cobblestone do I need to make the three smooth stone?
You need six cobblestone if you are starting from raw cobblestone. Three are smelted once into stone, and those three stone are each smelted a second time into the three smooth stone used in the recipe.
How long would 16 eligible items take in a blast furnace?
At 5 seconds per accepted item, 16 items require 80 seconds of processing time when the furnace runs continuously. That is the processing time only; loading, unloading, and any interruption are additional.
Can I use the blast furnace to make the smooth stone?
The preparation method described for smooth stone uses a regular furnace for both passes: cobblestone becomes stone, then stone becomes smooth stone. The important crafting requirement is that the final three items are smooth stone, regardless of how you organize your furnaces while preparing them.
Does a blast furnace consume less fuel because it is faster?
No. Its processing cycle is shorter for eligible inputs, but the fuel-use rate remains the same as a regular furnace. Build one for throughput, not for a reduction in fuel consumption.
Which hopper should receive the fuel?
Feed fuel through the hopper attached to the side of the blast furnace. The hopper above supplies the material to be smelted, while the hopper below removes the finished output.
Frequently Asked Questions
How much cobblestone do I need to make the three smooth stone?
Starting from cobblestone, use six pieces: three become stone in the first pass, and those three stone become smooth stone in the second pass.
How long would 16 eligible items take in a blast furnace?
At 5 seconds per accepted item, 16 uninterrupted items take 80 seconds of processing time. Loading and unloading time are separate.
Can I use the blast furnace to make the smooth stone?
The documented preparation method uses a regular furnace to smelt cobblestone into stone and then stone into smooth stone. Whatever furnace arrangement you use, the crafting grid must contain the finished smooth-stone items.
Does a blast furnace consume less fuel because it is faster?
No. It processes eligible items faster, but its fuel-use rate remains the same as a regular furnace.