Stress Units, Capacity and Impact
Now that we have Rotation and Speed covered we need to talk about the last important mechanic: Stress. Stress is Create's simplified implementation of torque that allows for some balancing around rotation. To understand stress, we have to split components into 2 groups, Generators and Consumers. Generators have a certain Stress Capacity associated with them, while Consumers have a Stress Impact. As long as the total capacity of a system is greater or equal to the total impact the system will turn and all components will work. If, however, the total stress impact gets too large, the system will overstress, preventing all components from working. This state persists until either the impact gets lowered or some capacity added.
| Generator | Stress capacity | Speed |
|---|---|---|
| Creative Motor | 16384 SU per RPM | -256 to 256 RPM |
| Encased Fan | 16 SU per RPM (64 SU total) | 4 RPM |
| Furnace Engine | 1024 SU per RPM | 16 or 32 RPM |
| Hand Crank | 8 SU per RPM (256 SU total) | 32 RPM |
| Valve Handle | 8 SU per RPM (128 SU total) | 16 RPM |
| Windmill Bearing | 512 SU per RPM | 1 to 16 RPM |
| Waterwheel | 16 SU per RPM | 6 to 20 RPM |
| Stress per RPM | Consumers |
|---|---|
| 1 SU |
Cuckoo Clock Mechanical Belt |
| 2 SU |
Encased Fan (as component) Mechanical Crafter (for each unit) |
| 4 SU |
Deployer Hose Pulley Mechanical Bearing Mechanical Drill Mechanical Mixer Mechanical Piston Mechanical Pump Mechanical Saw Millstone Rope Pulley |
| 8 SU |
Crushing Wheels (for each unit) Mechanical Arm Mechanical Press |
The amount of Stress a component has also scales with its current speed. All components have a certain Base Value, which refers to a speed of 1 RPM. To get the effective impact or capacity all you need to do is multiply that base value by its current speed. For example a water wheel (base value of 4 SU) turning at 5 RPM will add a total of 20 SU of capacity to the system, while the same wheel turning at 10 RPM will add 40 SU. The same logic applies to consumers: A crushing wheel running at 20 RPM adds 160 SU of impact to the system.
By default, components used only for relaying rotational power, such as shafts and cogwheels, have no stress impact at all. This makes predicting the amount of generators required for your contraptions much simpler and prevents punishment for aesthetic detours between machines and generators.
In the end this means that if you want to run 2 crushing wheels you'll need 4 water wheels running at the same speed or you can get away with just a single one if you slow down the crushers to a quarter of its speed instead. Read more about changing speeds here
Optimising stress impact and comparing net capacity of sources at base speed can become quite scientific. For those who are interested in seeing some actual numbers and more exhaustive information, it is recommended to look into crafting a pair of Goggles and a Stress Gauge:
Stats of a water wheel turning at 10 RPM:
Stats of a crushing wheel working at 20 RPM:
Example of a stress gauge on a busy network:
