Which of the following is NOT a variation of cross-dial alignment?

In the context of cross-dial alignment, understanding the variations is crucial to effective shaft alignment practices. The term "cross-dial alignment" typically refers to a technique that uses two dial indicators to measure shaft misalignment from different angles.

Parallel reading, while a valid term in the context of measurement, does not specifically refer to a standard variation within cross-dial alignment methodologies. This technique does not align with the common practices utilized in cross-dial alignment systems, which often include methods such as reverse reading, where the readings are taken from both sides of the alignment to cross-check accuracy, and graphs that help visualize the misalignment. Additionally, the option where both dials read off the same shaft indicates a legitimate alignment setup but does not represent a distinct category within cross-dial variations.

Thus, parallel reading stands out as not being a recognized variation in the cross-dial alignment process. Understanding these distinctions helps practitioners effectively use alignment techniques tailored to their specific needs.