Which tool is used for measuring shaft misalignment?

The dial indicator is used for measuring shaft misalignment because it provides precise measurements of any deviation in alignment between two shafts. When shafts are misaligned, it can lead to increased wear on bearings, abnormal vibrations, and potential failure of equipment. The dial indicator can measure these misalignments with a high degree of accuracy by detecting variations in distance as the indicator's probe touches various points on the shafts.

In practical applications, a technician can use the dial indicator to measure the gap or space between the shafts as they rotate and adjust their position as needed to achieve proper alignment. This process is crucial in ensuring the functionality and lifespan of machinery.

The other tools mentioned serve different purposes. For example, a caliper is primarily used for measuring dimensions such as length, width, and thickness, while a torque wrench is designed to apply a specific amount of torque to a bolt or nut. A pressure gauge measures fluid pressure in systems, which is unrelated to the alignment of shafts. Thus, the dial indicator is the appropriate choice for addressing shaft misalignment.