What tool is commonly used for measuring shaft alignment?

A dial indicator is commonly used for measuring shaft alignment because it provides precise measurements of the relative positions of two shafts. When aligning shafts, it is crucial to determine any misalignment that could cause vibration, wear, or breakdown in machinery. The dial indicator can measure the slightest variations in shaft height or angle, allowing for accurate adjustments to be made to achieve proper alignment.

By placing the dial indicator against a rotating shaft, readings can be taken at various points to assess whether the shafts are in alignment. This tool allows the millwright to make precise calculations and adjustments, ensuring that the machinery operates efficiently and reliably over time.

Although other tools, such as laser levels, can assist in alignment tasks, the dial indicator is specifically designed for capturing small discrepancies in shaft alignment, making it the preferred choice in this context.