Preparing the published article.
Performance Terms: Repeatability, Accuracy, Resolution
Three numbers that are routinely confused.
Definitions
| Term | Definition | Matters for |
|---|---|---|
| Repeatability | Consistency of returning to the same point | Taught positions |
| Path accuracy | Deviation from the commanded path | Sealing, welding, cutting |
| Resolution | Smallest commanded increment | Not the same as accuracy |
| Absolute accuracy | How close the robot gets to a commanded coordinate | Offline programming, vision |
Practical consequence
A robot can be highly repeatable but inaccurate. Taught programming cares about repeatability; anything driven by coordinates cares about accuracy, which is improved by calibration.