When plotting the centerline of the machine in a cross dial alignment, which dial readings are used?

When determining the centerline of a machine during a cross dial alignment, the appropriate practice is to use both A and B dial readings. This is because both dials provide critical information that allows for a more accurate assessment of the alignment between the shafts or components being measured.

Using both A and B readings allows for the identification of any misalignment that may exist between the two machines. Each dial measures displacement from the centerline as the machines are rotated, offering a comprehensive view of any offsets or angular misalignments. By analyzing the readings from both dials together, the technician can make precise adjustments to bring the machine back into alignment.

The inclusion of both dials ensures that corrections can be made not just in one dimension but across all necessary dimensions. Therefore, utilizing both readings is essential for achieving optimal alignment, which is crucial for the efficient operation and longevity of machinery.