---
title: Stonemill
id: morered:stonemill
type: block
---

Stonemills are mechanical-power-consuming blocks that continually generate cobblestone when supplied with water and lava.

<table>
	<thead><tr><th>Contents</th></tr></thead>
	<tbody><tr><td>
		1. [Recipes](#recipes)
		2. [Usage](#usage)
		3. [Data](#data)
		4. [History](#history)
	</td></tr></tbody>
</table>

## Recipes

<table>
	<thead>
		<tr>
			<th>Recipe Type</th>
			<th>Ingredients</th>
			<th>Output</th>
			<th>Example</th>
		</tr>
	</thead>
	<tbody>
		<tr>
			<td>Shaped Crafting</td>
			<td>
				* 2x [<ModAsset width={32} height={32} location='iron_ingot'/> Iron Ingot](@iron_ingot)
				* 2x [<ModAsset width={32} height={32} location='iron_bars'/> Iron Bars](@iron_bars)
				* 2x [<ModAsset width={32} height={32} location='obsidian'/> Obsidian](@obsidan)
				* 1x [<ModAsset width={32} height={32} location='morered:item/oak_axle'/> Axle](@morered:oak_axle)
				* 1x [<ModAsset width={32} height={32} location='diamond_pickaxe'/> Diamond Pickaxe](@diamond_pickaxe)
				* 1x [<ModAsset width={32} height={32} location='hopper'/> Hopper](@hopper)
			</td>
			<td>
				* 1x Stonemill
			</td>
			<td>
				<br/>
				![Shaped Crafting Recipe for Stonemills](https://commoble.s3.us-east-1.amazonaws.com/images/morered/recipes/stonemill_recipe.png)
			</td>
		</tr>
	</tbody>
</table>

## Usage

In order to function, a stonemill must receive mechanical power via its top side, and have [water](@water) and [lava](@lava) and lava with a fluid depth of at least 4 next to the "grates" on two of its sides.

![Stonemill connected to water, lava, and a rotating axle](https://commoble.s3.us-east-1.amazonaws.com/images/morered/stonemill.png)

The stonemill requires a large amount of torque in order to grind cobblestone. Using [Gearshifters](@morered:oak_gearshifter) can reduce the required power generated.

If the stonemill is rotated at least 1/32 rotations per second, and has both lava and water touching the grates,
the stonemill will generate cobblestone at a rate of betweeen 31 and 94 ticks per cobblestone, depending on how fast it spins.
To reach maximum cobblestone per second, a stonemill must rotate at 2 rotations per second.

The stonemill has a one-slot inventory which can be accessed by right-clicking it.

![Stonemill GUI with one inventory slot containing cobblestone](https://commoble.s3.us-east-1.amazonaws.com/images/morered/stonemill_gui.png)

If there is an inventory such as a [barrel](@barrel) or [tube](@morered:tube) underneath the block, the stonemill will automatically insert its stack of cobblestone
into the inventory when there is no more room for new cobblestone (meaning [hoppers](@hopper) are not necessary to automate item transfers).

Wooden axles and gears are ignitable by lava, but using mechanisms made from [crimson stems](@crimson_forest) or [warped stems](@warped_forest) can avert this.

## Data

| Blockstate Properties | Values | Description
| --- | - | -
| `axis` | `{"x", "z"}` | Whether the grates are facing west and east, or north and south
| `enabled` | `{"true", "false"}` | Whether the grates are connected to sufficient levels of both water and lava

Blockentity data has the following format:

```json
{
	"morered:stonemill": {
		"progress": <int>,
		"gen_timestamp": <long>
	},
	"inventory": {
		"stacks": <list of itemstacks>
	}
}
```
| BlockEntity Data | Format | Description
| --- | - | -
| `progress` | integer | Value in the range [0, 63]. How much progress the stonemill has accumulated to the next cobblestone.
| `gen_timestamp` | long | Timestamp (in game time ticks) of when the last cobblestone was generated. Cobblestone begins generating again 30 ticks after this timestamp.
| `stacks` | List of Itemstack objects | Has values "id", "count", and "data". Only the first slot is used.

## History
| Version | Changelog
| --- | -
| 21.10.0 | Inventory is now serialized under inventory -> stacks
| 1.21.8-8.0.0.0 | Added to More Red