7.2.3 Accuracy Classes
MINIRAIL carriages and guide rails are made to a high precision independently of each other. The carriages are interchangeable. This means that any carriage of the same size and accuracy class can be used on the guide rails without influencing the preload class.
MINISCALE PLUS carriages and guide rails are also made to a high precision. Due to the integrated linear encoder, the carriage and guideway are matched together and therefore can only be changed as a set.
Both G1 and G3 accuracy classes offer a precise MINIRAIL range suited to the application-specific needs of the customer. The accuracy classes determine the size tolerances and the running accuracy of the carriages on the guideways:
- High accuracy G1
- Standard accuracy G3
Note
- MINIRAIL are available in accuracy classes G1 and G3
- MINISCALE PLUS are always delivered in accuracy class G1
Accuracy class measurement diagram — A, B2 dimensions marked side / Reference side
Tolerances
| Accuracy class | Tolerances | |
|---|---|---|
| A and B2 | ΔA and ΔB2 | |
| G1 | +/- 10 µm | 7 µm |
| G3 | +/- 20 µm | 15 µm |
| A and B2: Measured relative to carriage centre ΔA and ΔB2: Difference in measurement between several carriages on the same position on the rails | ||
For the measurements mentioned above, the guideway is mounted on a flat surface. Measurement is taken from the middle of the carriage. Since the measurement is stable, it is based on the midpoint of the two supporting surfaces.