NCCER Millwright Practice Exam

Once the coupling gap is set, what is subsequently measured?

1. Alignment tolerances

2. Drive shaft length

3. Distance to the bearing

4. Coupling distance

The correct answer is: Coupling distance

When the coupling gap is set, the next step typically involves measuring the coupling distance. This measurement ensures that the components are properly aligned and that there is the correct spacing between the coupling halves. Accurately setting the coupling distance is critical for the efficient operation of connected machinery, as it can affect vibration levels, wear on bearings, and overall system performance. This measurement provides information on how much space exists between the couplings once they are aligned, which is essential for preventing potential issues such as binding or excessive wear during operation. Ensuring the correct coupling distance contributes to the longevity and reliability of the equipment. Other measurements, like alignment tolerances, may also be assessed later, but they do not follow directly after setting the coupling gap.