What does the term "zero" in alignment measurements refer to?

In the context of alignment measurements, "zero" refers to the point where the rotational axes of two connected components perfectly align. This ideal alignment is essential for the efficient and smooth operation of machinery, as any misalignment can lead to increased wear, vibration, and can affect overall performance and reliability. Achieving "zero" alignment ensures that there is minimal or no angular or parallel misalignment, which is critical for maintaining proper machinery function and extending its lifespan.

The concept of "zero" in alignment ultimately indicates the condition where the machine's rotating parts are in perfect sync, allowing for optimal performance and reduced stress on both the equipment and its components. Therefore, focusing on achieving this "zero" position during alignment procedures is paramount for millwrights and those involved in machinery maintenance and assembly.