When referring to mechanical applications, what is a shim primarily used for?

A shim is primarily used in mechanical applications to fill gaps or spaces between objects. This is crucial for ensuring proper alignment, leveling, and clearance in machinery assembly or installation. By inserting shims, technicians can adjust the fit of components to prevent undue stress, vibration, or wear, which can lead to equipment failure over time.

Shimming is an essential practice in various contexts, such as machinery leveling, improving the fit of parts, and ensuring that moving components operate smoothly without interference. The precision gained from the correct application of shims can greatly enhance the overall performance and longevity of machinery.