Machines need Machinists nearby to repair, fuel an reload your machines. A Machinists bench must be within 20 blocks of a machine in order for the machinist to operate it. Machinists will repair a machine at 50% durability, refuel a machine when it drops below 30% of fuel or reload a machine when it drops below 30% of items it requires (such as ammo).
|Waiting for a machine to need servicing.|
|Repairing the machine.|
|Refueling the machine.|
|Reloading the machine with items|