Machines

Machines are an upcoming branch of the Invention skill, counterparts to devices. Machines were introduced with Update:Invention Batch 2 update on 18 September 2017.

Machines are built in the formerly blocked off back portion of the Invention Guild. Upon reaching [required level] Invention, Doc will offer a short optional tutorial on machines (which can be skipped at any time after starting).

Generator and charge
The first machine built is the generator. Only one generator can be built, though it can be upgraded twice. The generator converts divine charges into 'machine charge' and distributes this to all the other machines in the guild.

The generator also has a maximum power allotment, and each machine uses some amount of this allotment. Upgrading the generator provides more power, and upgraded versions of the other machines require more power. This means it is not possible to have all 5 tier 2 machines at once.

Building
Machines are built on hotspots in the Invention Guild basement. There are 6 hotspots and any of the machines can be built in any of the hotspots. Building machines costs a significant number of materials.

Once built, machines can be upgraded (using more materials) to a more powerful version that processes more, but also costs more power allotment and machine charge to run.

Usage
Machines perform their associated action automatically at every hour, on the hour - the 'machine tick'. They run even when the player is offline. Each machine processes a different amount of actions per hour, at a specific cost of machine charge (and sometime extra items). The inputs are processed into outputs at the machine tick.

Machines will continue to process for as long as they have machine charge and input items available, and as long as there is space in the output slots.

Interfaces
The generator shows how much machine charge and power allotment is used and available. Machine charge can be replenished with divine charges - 3000 machine charge per divine charge.
 * Generator

Machines have three input slots, which accept all items relevant to the machine - though items of over 500,000 Grand Exchange value each cannot be input, nor can augmented items. Items are processed from left to right, signified by a hilighted square around the item that will be processed at the next machine tick.
 * Machines

The bar in the center shows the total machine charge available in the generator, with the small marking showing how much the machine will require to fully process all of the inputs.

There are three output slots, where the processed items will be placed, with an estimation of how long it will take to process everything (until either charge or inputs run out).

Cumulative requirements
The material requirements to build both tiers of a machine at once.

Machine charge per item
As a divine charge is and provides 3,000 machine charge, each machine charge costs the same as a personal charge -. The hourly and per-item cost for each machine is as follows (additional costs e.g. nature runes in brackets).