Which of the following is a common method used to check machine alignment?

Laser alignment is a widely recognized method for checking machine alignment due to its precision and accuracy. This technique employs a laser beam that is directed along the axis of a machine component, allowing for precise measurements of alignment in real-time. By shooting the laser from one point to another, technicians can determine whether the parts are aligned correctly based on the position of the returning beam in relation to the target.

The advantages of laser alignment include its ability to reduce the margin of error significantly compared to traditional methods and its non-contact nature, which minimizes potential damage to components. Additionally, laser alignment tools often come with software that can provide visual graphs and data that simplify analysis and guide corrections in alignment.

Other methods listed might serve different purposes in maintenance or diagnostics but are not primarily focused on alignment verification like laser alignment is. Vibration analysis is primarily used for assessing the condition and operational health of machinery rather than direct alignment checks. Ultrasonic testing is generally aimed at detecting flaws in materials and components through sound waves, while thermal imaging is useful for identifying hot spots and diagnosing overheating issues in machines.