In cross dial alignment, the total indicator reading of the dials is equal to:

In the context of cross dial alignment, understanding how total indicator readings relate to the shim adjustments is fundamental for ensuring precise equipment alignment.

When the total indicator reading (TIR) of the dials is taken during cross dial alignment, it measures the misalignment of the shafts being assessed. To correct this misalignment, shims are often used. The total indicator reading you gain from the dials gives you an indication of how misaligned the shafts are.

The correct response indicates that the total indicator reading, divided by two, will provide the amount of shim material needed to achieve proper alignment. This is because the indicator reading reflects the total displacement observed across both sides of the machine's centerline. Therefore, to adjust for this misalignment accurately, only half of the total misalignment needs to be compensated with shims on one side of the alignment.

This understanding helps technicians ensure that adjustments are made accurately and effectively, minimizing the chances of over or under-correcting the alignment and maintaining the integrity of the machinery involved.