Which factor does NOT contribute to shaft misalignment?

• A. Foundation settling
• B. Thermal expansion
• C. Proper installation
• D. Wear over time

Answer: (C)

Proper installation is essential for ensuring that machinery components align correctly from the outset. When a shaft is installed properly, it minimizes the risk of misalignment due to incorrect positioning or angling. This process involves precise alignment techniques, the use of appropriate tools, and adherence to specifications and tolerances that prevent misalignment from occurring after installation.

In contrast, foundation settling, thermal expansion, and wear over time are factors that can lead to misalignment after the initial installation. Foundation settling can cause a shift in the position of the machines, creating misalignment. Thermal expansion occurs when components heat up during operation, which can alter their alignment as materials expand. Similarly, wear over time can result in loose fittings, deteriorated components, and changes in the mechanical geometry of the equipment, all of which can contribute to misalignment. Hence, proper installation stands apart as it is a proactive measure directly aimed at ensuring alignment.