What is a primary purpose of using a feeler gauge during coupling alignment?

A primary purpose of using a feeler gauge during coupling alignment is to assess alignment precision. When aligning couplings in machinery, it is critical that the two shafts are correctly aligned to minimize wear, vibrations, and potential mechanical failure. A feeler gauge is a tool that can measure small gaps or spaces, allowing the operator to determine how well the coupling halves align with each other.

By inserting the feeler gauge into the gap between the couplings, the operator can quantify any misalignment. This measurement helps in ensuring that the shafts are not only parallel but also centered, providing precise information needed for making adjustments. Proper alignment leads to increased equipment efficiency, reduced wear on components, and longer operational life.

In contrast, measuring fluid viscosity, checking temperature, or evaluating motor speed do not directly relate to the physical alignment of mechanical components, as they pertain to different aspects of machinery operation and maintenance.