Which method is used to find L1 and L2 lengths in alignment measurements?

The method for finding L1 and L2 lengths in alignment measurements typically involves measuring from dial A. This approach allows for accurate assessment of the shaft alignment by determining the distance from a reference point on one of the dials to the coupling. By utilizing dial A, you synchronize measurements that help identify how misaligned two shafts are and establish the necessary adjustments to achieve optimal alignment.

Measuring from the center of the coupling or the feet may not provide the precision required for alignment tasks, as these points can introduce discrepancies based on the physical positioning of the assets being aligned. Dial B, while potentially useful for other reference points, specifically refers to a different measurement and does not directly relate to obtaining L1 and L2 lengths. Therefore, measuring from dial A is the preferred method due to its effectiveness in capturing the necessary data for accurate alignment assessments.