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Inserters

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Inserters are devices which are used to move items over short distances. When placed, they have a fixed direction. They can move items from behind and place them in front of them, this way, they can move items from one transport belt to another, but also extract items from and insert items into machines or storage devices. There are five types of inserters, all of them but the Burner Inserter, which requires fuel, using electricity.

Mechanics

Inserters will:

Inserters act differently depending on what they are moving items to/into so as not to monopolize all of the items being picked up. This allows other machines and inserters on the same transport belt to pick up a share of the items. If two inserters are picking up from the same tile, the first placed inserter has priority.

Insertion limits

Inserters will stop inserting items into certain buildings if they already have enough of that item. For example, if a boiler has 5 or more items of fuel in it, an inserter will not insert additional fuel. When the fuel drops below 5 items, the inserter will continue to insert more fuel, up to the limit of 5 items.

The reason for this behavior is, that otherwise the buffers would get too big; you would have resource problems for things further down the chain/line if the first things where trying to fill the input slot constantly.

Entity Item type Inserter limit Comment
Boilers, Burner inserters, Furnaces Fuel 5 Modders should avoid recipes for furnaces with fuel.
Gun turrets Magazines 10 Since v0.8.4
Assembling machines Items needed for the recipe Double the number of items needed in the recipe
Furnaces Items needed for the recipe Double the number of items needed in the recipe
Labs Science packs Double the number of items needed for one research point

An inserter that takes items from an object containing stacks of items (such as a chest) can overfill the target building due to the Inserter item stack size. Overfilling can also happen if you use multiple inserters to insert items into the building.

Inserters and transport belts

Transport belts have two lanes on which items can travel. Inserters only place items onto one side of the belt. Which side they place it on depends on the orientation of the inserter and the belt, as described below. If you want to rearrange the items once they are on a belt see Transport_belts/Belt_lane#Changing_side_of_lane.

  • Inserters will always place the item on the furthest lane.
  • Inserters prefer taking items from the nearest farest (since v0.11!) lane. The picture is wrong!
  • The end of the belt places the items onto the next Tile. Therefore, an inserter placed just past the end of the belt will be able to pick up items coming off of the belt. The end of the belt should be placed just before the inserter, to prevent two items from getting left at the end of the belt. This makes an inserter actually also faster, cause the item doesn't move here and he needs not to rotate so much, as when the item comes along with the belt. This can be clearly seen in the picture: the taking inserter is faster than the putting, cause he needs not to rotate the full 180 degrees, like his left neighbor.
  • Inserters can place items on
    • All types of conveyor belts
    • Underground belt entrances and exits
    • Curves, however there is a high chance that the items will block
  • Inserters cannot place items on splitters
  • Inserters can pick up items from
    • Splitters
    • The first half of the conveyor belt
  • Inserters have problems picking up items

Power usage

  • The electric driven inserters have a power-drain. This means, they are using energy, even when not moving.
  • The energy usage is a fixed amount per movement. This is for all inserters the same.
  • The Burner inserter has no drain, but uses more energy. It is quite useful for jobs, which don't need to move often.
  • Inserter Power Efficiency: Movements per energy and exact power usage numbers. See also this thread, where energy per movement is explained.
  • Small Inserter Test: Comparison if energy usage per item.
  • Inserters/Reduce power consumption
  • Inserter heartbeats: In some situations it is not possible to calculate the needed power usage.

Inserter speed

Type Rotation-speed (turns per Tick)
Extension-speed (Tiles per Tick)
Turns per Game-second
Tiles per Game-second
Game-second per full turn
Game-seconds per Tile
Burner inserter 0.01
0.02
0.6
1.2
1.667
0.833
Basic inserter 0.014
0.028
0.84
1.68
1.191
0.595
Long handed inserter 0.02
0.04
1.2
2.4
0.833
0.416
Fast inserter 0.035
0.07
2.1
4.2
0.476
0.238
Smart-inserter.png
Smart inserter
0.035
0.07
2.1
4.2
0.476
0.238

Rotation speed

Convention: 2π rad = 100% of a circle rotation = 1 turn (or one full rotation).

Note, that an Inserter doesn't always need to make full turns. There are several situations, where you can optimize the angles (and so the speed) of inserters by placing them not in the symmetry axis!

Extension speed

The extension-speed is normally not visible (only when compared to other inserters), but there are measurable speed differences when taking - for example - from the near or the far side of a belt.

This effect is also important for Train stations, when unloading items from wagons, cause the inserters needs to stretch out to the center of a wagon, which is some tiles long and leads to visible slower speed.

The extension speed is especially important for train unloading (not loading!).

Movement and energy usage

The energy usage is not dependend on the amount of rotation or extension, it is depending if the inserter starts an action, which is like grabbing, moving, release and returning. The entry and exit-piece of underground belts is technically only a half belt. Inserters will have problems to grab/place items from there and every try costs energy.

Types

Type Maximum power Description
Burner Inserter 180 W (burner) Most basic inserter, needs burning fuel.
Inserter.png
Inserter
13 W Basic electric inserter.
Long handed inserter 18 W Basic inserter able to grab Items from 2 tiles distance.
Fast inserter 30 W Working at double speed.
Smart-inserter.png
Smart inserter
40 W Able to connect to Circuit network and Logistic network, to specify working conditions. Can grab also specified item types only.

See also

Special behavior

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