What does 'tolerance' refer to in CNC machining?

'Tolerance' in CNC machining specifically refers to the allowable variation in a part's dimensions. It defines the acceptable limits to which a feature of the part can deviate from its nominal or target measurement. Tolerances are crucial in ensuring that parts fit and function correctly, particularly when multiple components must assemble and work together within a larger assembly.

In CNC machining, achieving the specified tolerance is vital for ensuring quality control and performance of the machined parts. For example, if a component is designed with a tolerance of ±0.01 mm, it means that the final measurement can be anywhere between 0.01 mm larger or smaller than the specified dimension, ensuring functional compatibility while allowing for some manufacturing variability.

The other options do not accurately reflect the concept of tolerance in this context. The speed of a CNC machine deals with its operational capabilities, not the dimensions of a manufactured part. The number of parts produced in a batch relates to production efficiency rather than dimensional accuracy. Finally, weight limits of the workpiece are concerns related to material handling and machine specifications, not to the dimensional specifications of the parts being machined. Therefore, acknowledging the proper definition of 'tolerance' helps in understanding essential quality standards in CNC machining.