7.2.4 Running Accuracy
In terms of tolerances, the running of the carriage on a guideway can take on either a linear or wave-like shape. The maximum permissible deviation is limited by the accuracy class of the guideway. As shown on the following diagram, the tolerance is determined by the rail length and by accuracy class G1 or G3.
C, D, E running accuracy measurement positions / Reference side
Running accuracy Δ (µm) vs. Rail length (mm) — G1 and G3
Example according to the diagram
A rail length of 600 mm and accuracy class G1 results in a maximum permissible deviation of 4.0 µm.
The parallelism deviations result from the manufacturing tolerances of the guide rails. The upper diagram shows the maximum parallelism deviation Δ (µm) in operation, depending on the guide rail length. A prerequisite for validity is an ideal installation of the respective guideway.