Table 1 The distribution of each error.
From: Motion error analysis of a shield machine tool-changing robot based on a screw-vector method
Error type | Distribution type | Mean value | Standard deviation |
|---|---|---|---|
Linkage dimension error | Normal distribution | 0Â mm | 0.2Â mm |
Driving error of moving joint | Normal distribution | 0Â mm | 0.3Â mm |
Driving error of rotating joint | Normal distribution | 0Â rad | 0.0087Â rad |
Joint axis deflection error | Normal distribution | 0Â rad | 0.00435Â rad |
