How do you define a “tolerance” in manufacturing?

Tolerance in manufacturing refers to the permissible limit or limits of variation in a physical dimension, which is crucial for ensuring that parts fit together and function as intended. Specifically, it describes the allowable variation in a part's dimensions, such as length, width, or diameter. This concept is essential for maintaining quality control in manufacturing processes, as it ensures that parts are produced within specific parameters that will allow them to perform their intended function effectively.

The ability to define tolerances accurately helps manufacturers to mitigate issues that arise from parts that are either too large or too small, which can cause assembly problems or failures in performance. Understanding tolerances is particularly important in additive manufacturing, where layers are built up to create complex geometries, and ensuring dimensional accuracy is critical to the success of the final printed part.

In this context, identifying the correct allowance for dimensions leads to better fit and function in assemblies, improved part interchangeability, and overall product reliability.