What are dial indicators mainly used for?

Dial indicators are primarily used for measuring radial or lateral runout, which refers to the deviation of a rotating part from its intended circular path. This tool is crucial in precision engineering and maintenance, as it allows technicians to identify misalignments or irregularities in components, such as wheels, shafts, and gears. By providing a visual display of movements in thousandths of an inch or millimeters, dial indicators help ensure that mechanical parts maintain their intended function, reducing wear and tear, and enhancing overall performance.

In contrast, measuring temperature, checking fuel efficiency, or diameter measurement do not align with the primary function of dial indicators. While temperature measurement requires thermometers or temperature sensors, fuel efficiency assessments typically involve specific calculations or tests unrelated to physical displacement measurements. Diameter measurement is more commonly performed with calipers or micrometers, tools designed specifically for determining sizes rather than assessing runout. Each of these methods serves distinct purposes within mechanical diagnostics and engineering, but they do not encompass the specialized capability of a dial indicator in measuring runout.