What does a tolerance of ±.003 signify in CNC machining?

A tolerance of ±.003 indicates the allowable deviation from a specified measurement in CNC machining. This means that the manufactured part can be 0.003 units larger or smaller than the nominal size specified in the design. Tolerances are critical in engineering and machining as they define the limits of acceptable variation, ensuring that parts fit together correctly and perform as intended.

When working with CNC machining, achieving the specified tolerance is essential for overall part functionality. If the tolerance is too wide, the part might not function correctly, and if it is too tight, it might be difficult or impossible to fabricate. Thus, the ±.003 tolerance provides a clear directive on how much deviation from the intended measurement is permissible, ensuring the precision and reliability of machined components.

The other options, while related to manufacturing processes, do not capture the definition of tolerance. Dimensional accuracy refers more broadly to how closely the part's dimensions agree with the desired specifications, but does not encompass the concept of allowable variations. Surface finish requirements pertain to the texture of the part's surface, which is a different aspect of machining quality, while feed rate adjustment relates to the speed at which the machine operates rather than dimensional specifications.